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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : Guiding electromagnetic waves through the bound states in the radiation continuum in novel types
Коллективы : International Conference on Metamaterials, Photonic Crystals and Plasmonics
Место публикации : The 9th International Conference on Metamaterials, Photonic Crystals and Plasmonics (META’18): Program/ spec. sess. org. A. F. Sadreev [et al.]. - 2018. - Session 4A10: Fano Resonances in Optics and Microwaves: Physics and Application III. - P.78
Примечания : Материалы конференции публикуются в журналах: Nanophotonics, Applied Physics A, Optical Materials Express, Advanced Electromagnetics
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bulgakov E. N., Maksimov D. N.
Заглавие : On bound states in the continuum in dielectric gratings
Коллективы : International Conference on Metamaterials, Photonic Crystals and Plasmonics
Место публикации : The 9th International Conference on Metamaterials, Photonic Crystals and Plasmonics (META’18): Program/ spec. sess. org. A. F. Sadreev [et al.]. - 2018. - Session 4A3: Fano Resonances in Optics and Microwaves: Physics and Application II. - P.71
Примечания : Материалы конференции публикуются в журналах: Nanophotonics, Applied Physics A, Optical Materials Express, Advanced Electromagnetics
Аннотация: In this work we experimentally observe a symmetry protected optical bound state in the continuum(BIC) with zero angular momentum in 1D array of ceramic disks at GHz frequencies. We analyze the dependence of Q factor of BIC on the number of the disks and the level of the material losses. We confirmed theoretical prediction about quadratic growth of the Q factor with the number of the disks and its following saturation due to material losses.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kolovsky A. R.
Заглавие : Wannier-Stark states and topological phase transitions in tilted two-dimensional bipartite lattices
Коллективы : Controlling quantum matter: From ultracold atoms to solids, Humboldt Kolleg, Vilnius University, Lithuanian Physical Society
Место публикации : Humboldt Kolleg. Controlling quantum matter: From ultracold atoms to solids: conference materials. - 2018
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Malakhovskii A. V., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Gudim I. A., Temerov V. L.
Заглавие : Local properties of rare earth ferroborates in the optically excited states
Коллективы : International Feofilov Symposium on spectroscopy of crystals doped with rare earth and transition metal ions
Место публикации : XVII International Feofilov Symposium on spectroscopy of crystals doped with rare earth and transition metal ions (IFS'XVII): book of abstracts. - 2018. - P.209-210
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tomilin F. N., Fedorov A. S., Artyushenko P. V., Ovchinnikov S. G., Ovchinnikova T. M., Tsikalova P. E., Soukhovolsky V. G.
Заглавие : Estimation of the thermal and photochemical stabilities of pheromones
Место публикации : J. Mol. Model. - 2018. - Vol. 24, Is. 11. - Ст.323. - ISSN 16102940 (ISSN), DOI 10.1007/s00894-018-3859-5
Примечания : Cited References: 35. - This study was supported by the Russian Foundation for Basic Research, Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project no. 16-44-243019 and the Russian Foundation for Basic Research, project no. 15-02-06869 and no. 16-04-00132.
Ключевые слова (''Своб.индексиров.''): kinetic stability--atomic structure--density functional theory--excited states--terpenes
Аннотация: The correlation between the kinetic stability of molecules against temperature and variations in their geometric structure under optical excitation is investigated by the example of different organic pheromone molecules sensitive to temperature or ultraviolet radiation using the density functional theory. The kinetic stability is determined by the previously developed method based on the calculation of the probability of extension of any structural bond by a value exceeding the limit value Lмах corresponding to the breaking of the bond under temperature excitation. The kinetic stability calculation only requires the eigenfrequencies and vibrational mode vectors in the molecule ground state to be calculated, without determining the transition states. The weakest bonds in molecules determined by the kinetic stability method are compared with the bond length variations in molecules in the excited state upon absorption of light by a molecule. Good agreement between the results obtained is demonstrated and the difference between them is discussed. The universality of formulations within both approaches used to estimate the stability of different pheromone molecules containing strained cycles and conjugated, double, and single bonds allows these approaches to be applied for studying other molecules.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sadreev A. F.
Заглавие : Near bound states in the radiation continuum in circulararray of dielectric rods
Коллективы : International Conference on Nanophotonics and Metamaterials, Санкт-Петербургский национальный исследовательский университет информационных технологий, механики и оптики
Место публикации : International Conference on Nanophotonics and Metamaterials(METANANO 2018). - 2018
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Knyazev Yu. V., Dudnikov V. A., Kazak N. V., Platunov M. S., Solovyov L. A., Verechschagin S. N., Burkov A. T., Novikov S. V.
Заглавие : Electronic states of the iron ions in the oxygen deficient perovskite Gd0.2Sr0.8FeO3-δ
Коллективы : Мёссбауэровская спектроскопия и её применения, международная конференция, Mössbauer Spectroscopy and Applications, International Conference, Южный федеральный университет, МИРЭА-Российский технологический университет, Российская академия наук, Институт кристаллографии им. А.В. Шубникова РАН, Федеральный научно-исследовательский центр "Кристаллография и фотоника" РАН, Московский государственный университет им. М.В. Ломоносова
Место публикации : Мёссбауэровская спектроскопия и её применения: сб. материалов XV международной конференции. - Ростов-на-Дону, 2018. - С. 45. - ISBN 978-5-9275-2831-8
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pyatnov M. V., Timofeev I. V., Vetrov S. Ya., Rudakova N. V.
Заглавие : Coupled chiral optical Tamm states in cholesteric liquid crystals
Место публикации : Photonics. - 2018. - Vol. 5, Is. 4. - Ст.30. - ISSN 23046732 (ISSN), DOI 10.3390/photonics5040030
Примечания : Cited References: 38. - This research was funded by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund, to the research Project Nos. 17-42-240464 and 18-42-243025.
Ключевые слова (''Своб.индексиров.''): cholesteric liquid crystal--optical tamm states--localization--transmission spectrum--optical devices
Аннотация: The modes formed by two coupled chiral optical Tamm states localized at the interfaces between a photonic cholesteric liquid crystal conjugated with polarization-preserving anisotropic mirrors have been analytically and numerically investigated. These modes are only excited at the diffracting polarization of incident light. As the cholesteric layer thickness decreases, the spectral splitting of the localized state frequency is predicted. The splitting value depends on the crystal layer thickness. At the nondiffracting circular polarization, the localized modes are not excited, and the system becomes similar to the Fabry-Perot cavity containing an anisotropic helical structure.
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Вид документа : Статья из сборника (выпуск монографической серии)
Шифр издания :
Автор(ы) : Sadreev A. F., Pilipchuk A. S., Pilipchuk A. A.
Заглавие : Tuning of fano resonance by waveguide rotation: Wave faucet and bound states in the continuum
Место публикации : Fano Resonances in Optics and Microwaves: Physics and Applications/ ed.: E. Kamenetskii, A. Sadreev, A. Miroshnichenko: Springer, 2018. - Vol. 219. - P.497-525. - (Springer Series in Optical Sciences; Vol. 219). - , DOI 10.1007/978-3-319-99731-5_21
Примечания : Cited References: 52. - This work has been supported by RFBR through Grant 17-02-00440. A. S. acknowledges discussions with E. N. Bulgakov, D. N. Maksimov, H. Schanz, P. Seba, L. Sirko, H.-J. Stöckmann and Shubo Wang.
Аннотация: We consider acoustic wave transmission in a non-axisymmetric waveguide composed of a cylindrical resonator of radius R and length L and two cylindrical waveguides of radius rR. The center lines of the waveguides are shifted relative to the center line of the resonator by a distance r0 and relative to each other by an azimuthal angle Δϕ. Under variation of L and fixed Δϕ we find bound states in the continuum (trapped modes) due to full destructive interference of resonant modes leaking into waveguides. Rotation by the angle Δϕ brings complex phases into the coupling strengths of the resonator eigenmodes with propagating modes of the waveguides. As the result interference of neighboring resonances strongly depends on rotation of the waveguide introducing novel way for tuning Fano resonances. In turn rotation of the input waveguide strongly affect the acoustic transmission through the resonator imitating a faucet in wave transmission. Under variation of Δϕ and fixed L we find symmetry protected trapped modes. For Δϕ≠0 these trapped modes contribute to the scattering function supporting high vortical acoustic intensity spinning inside the resonator.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Maksimov D. N.
Заглавие : Avoided crossings and bound states in the continuum in low-contrast dielectric gratings
Коллективы : Ministry of Education and Science of the Russian Federation [3.1845.2017/4.6]
Место публикации : Phys. Rev. A. - 2018. - Vol. 98, Is. 5. - Ст.053840. - ISSN 2469-9926, DOI 10.1103/PhysRevA.98.053840. - ISSN 2469-9934(eISSN)
Примечания : Cited References: 49. - This work was supported by Ministry of Education and Science of the Russian Federation (State Contract No. 3.1845.2017/4.6). We are grateful to K. N. Pichugin for assistance with the computations.
Предметные рубрики: RESONANCES
Аннотация: We consider bound states in the continuum (BICs) in low-contrast dielectric gratings. It is demonstrated that the BICs originate from the reduced guided modes on the effective dielectric slab with the permittivity equal to the average permittivity of the dielectric grating. In the case of isolated resonances, the positions of BICs can be found from two-wave dispersion relationships for guided leaky modes. In the case of the degeneracy between the two families of leaky modes, the system exhibits an avoided crossing of resonances. In the spectral vicinity of the avoided crossing the transmittance as well as the emergence of BICs is described in the framework of the generic formalism by Volya and Zelevinsky [Phys. Rev. C 67, 054322 ( 2003)] with a single fitting parameter.
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11.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kolovsky A. R.
Заглавие : Wannier-Stark states in two dimensions
Коллективы : International Conference on Quantum Optics
Место публикации : International conference on quantum optics: book of abstracts . - 2018. - P.52
Аннотация: Wannier-Stark states are the second after Bloch waves fundamental states of a quantum particle in a lattice. These states are well understood in one dimen- sion but their extension into two dimensions continues to surprise researches. In the talk I briefly review main properties of Wannier-Stark states of a quan- tum particle in ‘ordinary’ two-dimensional lattices and then highlight recent results for lattices with flat Bloch bands, where Wannier-Stark states possess interesting topological properties.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lyapina A. A., Pilipchuk A. S., Sadreev A. F.
Заглавие : Bound states with orbital angular momentum in the continuum of cylindrical non-axisymmetric waveguide
Место публикации : Ann. Phys. - 2018. - Vol. 396. - P.56-70. - ISSN 00034916 (ISSN), DOI 10.1016/j.aop.2018.05.020
Примечания : Cited References: 28. - This work has been supported by RFBR Grant 17-02-00440 . We thank D.N. Maksimov for discussions.
Ключевые слова (''Своб.индексиров.''): acoustic wave transmission--spinning trapped modes with orbital angular momentum
Аннотация: We consider acoustic wave transmission in a non-axisymmetric waveguide which consists of a cylindrical resonator of radius R and length L and two cylindrical waveguides of radius rR whose axes are shifted relative to the axis of the resonator and relative to each other by azimuthal angle Δϕ. We find multiple bound states in the continuum (trapped modes) with nonzero orbital angular momentum under variation of L due to full destructive interference of resonant modes leaking into waveguides. For Δφ₌π∕2 we find the degenerate bound states in the continuum whose contribution into the scattering wave function is complex and supports giant vortical acoustic intensity spinning inside the resonator.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : Fibers based on propagating bound states in the continuum
Коллективы : Ministry of Education and Science of Russian Federation [3.1845.2017]; RFBR [16-02-00314, 17-52-45072]
Место публикации : Phys. Rev. B. - 2018. - Vol. 98, Is. 8. - Ст.085301. - ISSN 2469-9950, DOI 10.1103/PhysRevB.98.085301. - ISSN 2469-9969(eISSN)
Примечания : Cited References: 40. - The authors thank D. N. Maksimov for assistance and discussions. This work was partially supported by the Ministry of Education and Science of Russian Federation (State Contract No. 3.1845.2017) and the RFBR Grants No. 16-02-00314 and No. 17-52-45072.
Предметные рубрики: PHOTONIC CRYSTAL SLABS
LIGHT
RESONANCES
RADIATION
ARRAYS
Аннотация: We show that a circular periodic array of silicon dielectric cylinders supports nearly bound states in the continuum (BICs) propagating along the cylinders. These propagating nearly BICs with extremely large-Q factors are surrounded by resonant modes weakly leaking into the radiation continuum. We present leaky zones in the form of dispersion curves for complex eigenfrequencies dependent on propagation constant kz, with the wave vector directed along the cylinders in the vicinity of different types of BICs. Symmetry-protected nearly BICs have the resonant width proportional to squared propagation constant Γ∼k2z; the widths of non-symmetry-protected nearly BICs behave as Γ∼(kz−kc)2, where kc and non-symmetry-protected nearly BICs have the resonant width proportional to k4z. The latter propagating nearly BICs can serve for the transmission of a electromagnetic signal paving a way to a different type of optical fiber. We also demonstrate weakly leaking resonant modes which carry orbital angular momentum.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Romanova O. B., Sitnikov M. N., Kretinin V. V., Galyas, A., I, Yanushkevich, K., I
Заглавие : The alternating-sign magnetoresistance of polycrystalline manganese chalcogenide films
Коллективы : Russian Foundation for Basic Research (RFBR) [18-52-00009 Bel_a, 18-32-00079 mol_a, 18-42-240001 r_a]; [3.5743.2017/6.7]
Место публикации : Semicond. Sci. Technol. - 2018. - Vol. 33, Is. 8. - Ст.085006. - ISSN 0268-1242, DOI 10.1088/1361-6641/aace44. - ISSN 1361-6641(eISSN)
Примечания : Cited References: 33. - The reported study was funded by Russian Foundation for Basic Research (RFBR) according to the research project No 18-52-00009 Bel_a; No 18-32-00079 mol_a; No 18-42-240001 r_a; the state order No 3.5743.2017/6.7.
Предметные рубрики: NEUTRON-SCATTERING
SURFACE-STATES
MNTE
CONDUCTIVITY
MECHANISM
Ключевые слова (''Своб.индексиров.''): polycrystalline films--magnetoresistance--impedance--polaron--magnetic--properties--thermoelectric
Аннотация: The correlation between the dc and ac electrical resistance and the structural, magnetic, and thermoelectric properties of polycrystalline MnSe1−X Te Х (0.3 ≤ X ≤ 0.4) manganese chalcogenide films in the temperature range of 80–400 K has been investigated. Inhomogeneous electronic states and transitions between them accompanied by structural lattice deformations have been found at temperatures including the Neel temperature region. The magnetic susceptibility maximum above the Neel temperature in a magnetic field of 8.6 kOe has been observed. Temperature ranges of the coexistence of two types of electrically inhomogeneous states have been established by impedance spectroscopy in the frequency range of 0.1–1000 kHz and the change of the hopping conductivity for diffusion one accompanied by the magnetic susceptibility minimum has been found. The magnetoresistance in magnetic fields of up to 12 kОе has been established. It has been revealed that the thermopower and magnetoresistance change its sign upon heating. The experimental data are explained using a spin polaron model with the localization of polarons and formation of the electron phase-separation. The alternation of magnetoresistance in sign is attributed to the ferromagnetic orbital ordering of electrons and the negative magnetoresistance is explained by suppression of spin fluctuations in a magnetic field.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bychek A. A., Maksimov D. N., Kolovsky A. R.
Заглавие : NOON state of Bose atoms in the double-well potential via an excited-state quantum phase transition
Коллективы : Russian Foundation for Basic Research, Government of Krasnoyarsk Territory; Krasnoyarsk Region Science and Technology Support Fund [16-42-240746]
Место публикации : Phys. Rev. A. - 2018. - Vol. 97, Is. 6. - Ст.063624. - ISSN 2469-9926, DOI 10.1103/PhysRevA.97.063624. - ISSN 2469-9934(eISSN)
Примечания : Cited References: 60. - The authors acknowledge financial support from the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and the Krasnoyarsk Region Science and Technology Support Fund through Grant No. 16-42-240746.
Предметные рубрики: EINSTEIN CONDENSATE
SUPERPOSITION STATES
NOBEL LECTURE
ENTANGLEMENT
Аннотация: We suggest a simple scheme for creating a NOON state of repulsively interacting Bose atoms in the double-well potential. The protocol consists of two steps. First, by setting atom-atom interactions to zero, the system is driven to the upper excited state. Second, the interactions are slowly increased and, simultaneously, the interwell tunneling is decreased to zero. We analyze fidelity of the final state to the NOON state depending on the number of atoms, ramp rate, and fluctuations of the system parameters. It is shown that for a given fidelity the ramp rate scales algebraically with the number of atoms.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Samoshkina Yu. E., Rogalev A.
Заглавие : Electronic and magnetic states of Pr and Mn in the Pr1–xSrxMnO3 films studied by XANES and XMCD spectroscopy
Место публикации : J. Exp. Theor. Phys. - 2018. - Vol. 126, Is. 5. - P.660-665. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776118040131
Примечания : Cited References: 35. - We thank V.I. Chichkov and N.V. Andreev (National University of Science and Technology MISiS) for the preparation of the manganite films.This work was supported by the Russian Foundation for Basic Research (project no. 16-32-00209 mol_a) and a grant of the President of the Russian Federation (NSh-7559.2016.2).
Ключевые слова (''Своб.индексиров.''): circular dichroism spectroscopy--dichroism--film growth--magnetic moments--manganese--praseodymium--strontium compounds--x ray absorption
Аннотация: The spectral dependences of X-ray absorption near-edge spectroscopy (XANES) and X-ray magnetic circular dichroism (XMCD) and the field dependences of XMCD near the K edge of Mn and the L2,3 edges of Pr in the Pr0.8Sr0.2MnO3 and Pr0.6Sr0.4MnO3 films at T = 90 K are studied. The spectral dependences point to a mixed valence state of Mn and Pr in the films. It is found that, as compared to XANES, XMCD is more sensitive to the valence state of Pr4+. The field dependences of XMCD point to ferromagnetic behavior of Mn ions and the Van Vleck paramagnetism of Pr ions, which makes a significant contribution to the total magnetization of the films. It is shown that as the Sr concentration increases, the XMCD intensity at the K edge of Mn increases, which indicates a growth of the total magnetic moment of the film due to an increase in the 4p–3d hybridization.
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17.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Timofeev I. V., Pankin P. S., Vetrov S. Ya., Arkhipkin V. G., Lee W., Zyryanov V. Ya.
Заглавие : Chiral optical Tamm states: method of images
Коллективы : "Days on diffraction", International conference, Санкт-Петербургское отделение Института математики им. В. А. Стеклова, Санкт-Петербургский государственный университет, Euler International Mathematical Institute, Российский фонд фундаментальных исследований
Место публикации : Int. conf. "Days on diffraction": Abstracts. - 2018. - P.216-217
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bikbaev R. G., Vetrov S. Ya., Timofeev I. V.
Заглавие : Two types of localized states in a photonic crystal bounded by an epsilon near zero nanocomposite
Место публикации : Photonics. - 2018. - Vol. 5, Is. 3. - Ст.22. - ISSN 23046732 (ISSN), DOI 10.3390/photonics5030022
Примечания : Cited References: 53
Ключевые слова (''Своб.индексиров.''): photonic crystal--nanocomposite--epsilon near zero material--tamm plasmon polariton
Аннотация: The spectral properties of a one-dimensional photonic crystal bounded by a resonant absorbing nanocomposite layer with the near-zero permittivity have been studied. The problem of calculating the transmittance, reflectance, and absorptance spectra of such structures at the normal and oblique incidence of light has been solved. It is shown that, depending on the permittivity sign near zero, the nanocomposite is characterized by either metallic or dielectric properties. The possibility of simultaneous formation of the Tamm plasmon polariton at the photonic crystal/metallic nanocomposite interface and the localized state similar to the defect mode with the field intensity maximum inside the dielectric nanocomposite layer is demonstrated. Specific features of field localization at the Tamm plasmon polariton and defect mode frequencies are analyzed. © 2018 by the authors.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Maksimov D. N.
Заглавие : Optical response induced by bound states in the continuum in arrays of dielectric spheres
Коллективы : Ministry of Education and Science of the Russian Federation (Minobrnauka) [N 3.1845.2017]; Russian Foundation for Basic Research (RFBR) [16-02-00314]
Место публикации : J. Opt. Soc. Am. B. - 2018. - Vol. 35, Is. 10. - P.2443-2452. - ISSN 0740-3224, DOI 10.1364/JOSAB.35.002443. - ISSN 1520-8540(eISSN)
Примечания : Cited References: 51. - Ministry of Education and Science of the Russian Federation (Minobrnauka) (State Contract N 3.1845.2017); Russian Foundation for Basic Research (RFBR) (16-02-00314).
Предметные рубрики: COUPLED-MODE THEORY
LIGHT LINE
ENHANCEMENT
TRANSMISSION
TRANSITION
Аннотация: We consider an optical response induced by bound states in the continuum (BICs) in arrays of dielectric spheres. By combining the quasi-mode expansion technique with coupled mode theory (CMT), we put forward a theory of the optical response by high-Q resonance surrounding BICs in momentum space. The central results are analytical expressions for the CMT parameters, which can be easily calculated from the eigenfrequencies and eigenvectors of the interaction matrix of the scattering systems. The results obtained are verified in comparison against exact numerical solutions to demonstrate that the CMT approximation is capable of reproducing Fano features in the spectral vicinity of the BIC. Based on the quasi-mode expansion technique, we derived the asymptotic scaling law for the CMT parameters in the vicinity of the Γ-point. It is rigorously demonstrated that the linewidth in the CMT approximation exhibits different asymptotic behavior depending on the symmetry of the BIC.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nikitin S. E., Wu L. S., Sefat A. S., Shaykhutdinov K. A., Lu Z., Meng S., Pomjakushina, E., V, Conder K., Ehlers G., Lumsden M. D., Kolesnikov, A., I, Barilo S., Guretskii S. A., Inosov D. S., Podlesnyak A.
Заглавие : Decoupled spin dynamics in the rare-earth orthoferrite YbFeO3: Evolution of magnetic excitations through the spin-reorientation transition
Коллективы : US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division; German Research Foundation (DFG) [SFB 1143]; International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM); Laboratory Directed Research and Development Program of Oak Ridge National Laboratory; BFFR [F18KI-022]
Место публикации : Phys. Rev. B. - 2018. - Vol. 98, Is. 6. - Ст.064424. - ISSN 2469-9950, DOI 10.1103/PhysRevB.98.064424. - ISSN 2469-9969(eISSN)
Примечания : Cited References: 70. - We would like to thank A. Sukhanov, O. Stockert, and P. Thalmeier for useful discussions. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory. Part of this work was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. D.S.I. acknowledges funding by the German Research Foundation (DFG) through the Collaborative Research Center SFB 1143 at the TU Dresden (project C03). S.E.N. acknowledges support from the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). L.S.W. was supported by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US DOE. S.B. and S.A.G. are supported by BFFR, Grant No. F18KI-022
Предметные рубрики: MAGNON BOUND-STATES
ANTIFERROMAGNETIC CHAIN
NEUTRON-SCATTERING
Аннотация: In this paper, we present a comprehensive study of magnetic dynamics in the rare-earth orthoferrite YbFeO3 at temperatures below and above the spin-reorientation (SR) transition TSR=7.6K, in magnetic fields applied along the a,b, and c axes. Using single-crystal inelastic neutron scattering, we observed that the spectrum of magnetic excitations consists of two collective modes well separated in energy: 3D gapped magnons with a bandwidth of ∼60meV, associated with the antiferromagnetically (AFM) ordered Fe subsystem, and quasi-1D AFM fluctuations of ∼1meV within the Yb subsystem, with no hybridization of those modes. The spin dynamics of the Fe subsystem changes very little through the SR transition and could be well described in the frame of semiclassical linear spin-wave theory. On the other hand, the rotation of the net moment of the Fe subsystem at TSR drastically changes the excitation spectrum of the Yb subsystem, inducing the transition between two regimes with magnon and spinonlike fluctuations. At TTSR, the Yb spin chains have a well defined field-induced ferromagnetic (FM) ground state, and the spectrum consists of a sharp single-magnon mode, a two-magnon bound state, and a two-magnon continuum, whereas at TTSR only a gapped broad spinonlike continuum dominates the spectrum. In this work we show that a weak quasi-1D coupling within the Yb subsystem JYb-Yb, mainly neglected in previous studies, creates unusual quantum spin dynamics on the low-energy scales. The results of our work may stimulate further experimental search for similar compounds with several magnetic subsystems and energy scales, where low-energy fluctuations and underlying physics could be “hidden” by a dominating interaction.
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