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BULGAKOV, E. N.
MESOSCOPIC RING UNDER THE INFLUENCE OF TIME-PERIODICAL FLUX - AHARONOV-BOHM OSCILLATIONS AND TRANSMISSION OF WAVE-PACKETS / E. N. BULGAKOV, A. F. SADREEV // Phys. Rev. B. - 1995. - Vol. 52, Is. 16. - P. 11938-11944, DOI 10.1103/PhysRevB.52.11938. - Cited References: 25 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
QUANTUM OSCILLATIONS
NETWORKS
TRANSPORT
Аннотация: The Aharonov-Bohm oscillations in the transmission probability of a one-dimensional mesoscopic ring between two electrodes are considered numerically where a time-periodical flux gamma(t)=gamma+lambda cos omega t is applied. Such a flux simulates a phase-coherent inelastic scattering due to the absorption/emission processes of modulation quanta. An increase of alternating flux amplitude lambda drastically changes the Aharonov-Bohm oscillations of the transmission though the exact period remains phi(0)=hc/e. A frequency dependence of the transmission has abrupt steps at omega=(E-E(F))/n, caused by the locking of the transmission in the nth channel where EF is the Fermi level. Moreover, for transmission of a narrow wave packet the time-periodical flux gives rise to two effects. The first is a fractioning of the input wave packet by the ring in such a way that the output wave function consists of a few separate wave packets. Their number, distance apart, and height essentially depend on the static flux gamma. The second effect is a strong space squeezing of the output wave packet.

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Держатели документа:
L. V. Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
SADREEV, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
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Influence of static electric field, mechanical pressure and temperature on the propagation of acoustic waves in La3Ga5SiO14 piezoelectric single crystals / B. P. Sorokin [et al.] // Proc Annu IEEE Int Freq Control Symp. - 1996. - P. 161-169 . - ISBN 01616404
Кл.слова (ненормированные):
Acoustic wave transmission -- Anisotropy -- Electric field effects -- Lanthanum compounds -- Piezoelectric materials -- Pressure effects -- Thermal effects -- Piezoelectric single crystals -- Single crystals
Аннотация: On the fundamental of our original experimental results the full set of tensorial components of linear and nonlinear electromechanical properties and temperature coefficients of material properties for La3Ga5SiO14 piezoelectric crystals have been obtained. These data were used for the analysis of influence of static electrical field and of uniaxial homogeneous mechanical pressure on the propagation anisotropy of acoustic waves superposed by the temperature variations.

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Доп.точки доступа:
Sorokin, B. P.; Turchin, P. P.; Burkov, S. I.; Glushkov, D. A.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; International frequency control symposium(50 ; 1996 ; Jun. ; 5-7 ; Honolulu, HI, USA)
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Resonant tunneling in time-periodically modulated semiconductor nanostructures / G. P. Berman [et al.] // Physica B. - 1996. - Vol. 225, Is. 1-2. - P. 1-22, DOI 10.1016/0921-4526(96)00233-5. - Cited References: 39 . - ISSN 0921-4526

РУБ Physics, Condensed Matter
Рубрики:
DOUBLE BARRIERS
TRANSMISSION
HETEROSTRUCTURES
Аннотация: We consider a semiconductor (AlGaAs/GaAs/AlGaAs) double-barrier resonant tunneling nanostructure (DBRTS), in which the bottom of the potential well is modulated by an external periodic potential V(t) = V-mod cos Omega t. We examine the resonance response to both mono-energetic and spatially localized incident electrons, extending previous results in three ways. First, we study numerically the resonant characteristics in the transmission probabilities as functions of both the electron's energy and the frequency of the external field. We find that new low-frequency resonant peaks appear in the frequency dependence of the transmission probabilities and discuss the origin and possible experimental observation of these peaks. Second, we develop an analytic perturbation theory (valid for small values of the parameter lambda = V-mod/h Omega) describing the processes of absorption and emission of single quanta of the modulation field and show that this perturbative treatment agrees well with the results of numerical calculations in the appropriate regions, up to and including the regime in which the one-quantum processes saturate. Third, for localized (Gaussian) incident wave packets, we show numerically that temporal modulations of the potential well in the DBRTS can induce spatial modulations in the transmitted and reflected wave packets. We develop a simple qualitative picture that explains our results. Finally, we estimate characteristic values of the parameters relevant for possible observation of these effects in laboratory experiments.

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Держатели документа:
LOS ALAMOS NATL LAB,CNLS,LOS ALAMOS,NM 87545
LV KIRENSKII INST PHYS,DEPT PHYS,KRASNOYARSK 660036,RUSSIA
UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801
ИФ СО РАН

Доп.точки доступа:
Berman, G. P.; Берман, Геннадий Петрович; Bulgakov, E. N.; Булгаков, Евгений Николаевич; Campbell, D. K.; Sadreev, A. F.; Садреев, Алмаз Фаттахович
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Bulgakov, E. N.
Current-voltage characteristics of the resonant tunnelling double-barrier structure under time-periodical perturbation / E. N. Bulgakov, A. F. Sadreev // J. Phys.: Condens. Matter. - 1996. - Vol. 8, Is. 45. - P. 8869-8887, DOI 10.1088/0953-8984/8/45/020. - Cited References: 38 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
SEMICONDUCTOR DOUBLE-BARRIER
   OSCILLATING QUANTUM-WELL
   DEPENDENT TRANSPORT
   INFRARED-RADIATION
   TUNNELING TIMES
   HETEROSTRUCTURES
   TRANSMISSION
   MODEL
   FREQUENCIES
   COHERENT
Аннотация: We consider a typical semiconductor resonant tunnelling GaAs/AlGaAs/GaAs nanostructure which forms a double-barrier potential with quasienergy levels corresponding to transition frequencies in the infrared and microwave regions. Two types of dynamical perturbation of the heterostructure in the form V-1(x, t) = V(1)x cos Omega t and V-2(t) = V-2 cos Omega t are considered. We analyse numerically a reconstruction of the electron transmission through the heterostructure and the current-voltage characteristics (IVC) under the influence of these dynamical perturbations. Both weak and strong perturbations are considered. We investigate the dependences of the transmission on the electron energy and the frequency of the external field with the main accent on the case where a frequency of the perturbation is tuned to a transition between quasienergies of the double-barrier structure. it is found that these resonant phenomena give rise to new peaks and dips in the IVC. In particular, it is shown that the dipole type of perturbation V-1(x, t) gives rise to a Rabi splitting of the transmission peaks and under certain conditions to a Rabi splining of the IVC peaks and dips. We demonstrate that dynamical perturbation may induce a direct current opposite to the direction of the applied voltage, and that this phenomenon takes the form of a sharp dip which has a resonant origin. It is observed that the dipole type of perturbation V-1(x, t) of laser radiation is more effective for tuning the IVC than the first perturbation V-2(t). Also absorption and emission of energy by an electron transmitted through the DBRTS are considered.

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Держатели документа:
Kirensky Institute of Physics, 660036, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
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Non-linear electromechanical properties and propagation of acoustic waves under the action of external static fields in the piezoelectric La3Ga5SiO14 / K. S. Aleksandrov [et al.] // Russ. Ultrason. - 1997. - Vol. 27, Is. 3. - P. 193-196 . - ISSN 0048-8828
Кл.слова (ненормированные):
Acoustic wave transmission -- Anisotropy -- Data reduction -- Electric field effects -- Electrostriction -- Lanthanum compounds -- Piezoelectric materials -- External static fields -- Nonlinear electromechanical properties (NEMP) -- Single crystals
Аннотация: A full set of parameters has been obtained for the linear and non-linear electrostriction properties of an La3Ga5SiO14 single crystal. The data have been used for an analysis of the anisotropy of the anharmonic effects and special features of the influence of a constant electric field on the propagation of acoustic waves in this crystal.

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Держатели документа:
Krasnoyarsk State Univ, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Turchin, P. P.; Sorokin, B. P.; Burkov, S. I.; Красноярский государственный университет
}
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Quantum nonlinear resonance and quantum chaos in Aharonov-Bohm oscillations in mesoscopic semiconductor rings / G. P. Berman [et al.] // Phys. Rev. B. - 1997. - Vol. 56, Is. 16. - P. 10338-10354, DOI 10.1103/PhysRevB.56.10338. - Cited References: 51 . - ISSN 0163-1829

РУБ Physics, Condensed Matter
Рубрики:
EXCITED HYDROGEN-ATOMS
   FREQUENCY ELECTROMAGNETIC-FIELD
   PERSISTENT CURRENTS
   NORMAL-METAL
   ENERGY SPACE
   LOCALIZATION
   TRANSPORT
   LOOP
   TIME
   TRANSMISSION
Аннотация: We consider Aharonov-Bohm oscillations in a mesoscopic semiconductor ring threaded by both a constant magnetic flux and a time-dependent, resonant magnetic field with one or two frequencies. Working in the ballistic regime, we establish that the theory of ''quantum nonlinear resonance'' applies, and thus that this system represents a possible solid-state realization of ''quantum nonlinear resonance'' and ''quantum chaos.'' In particular, we investigate the behavior of the time-averaged electron energy at zero temperature in the regimes of (i) an isolated quantum nonlinear resonance and (ii) the transition to quantum chaos, when two quantum nonlinear resonances overlap. The time-averaged energy exhibits sharp resonant behavior as a function of the applied constant magnetic flux, and has a staircase dependence on the amplitude of the external time-dependent field. In the chaotic regime, the resonant behavior exhibits complex structure as a function of flux and frequency. We compare and contrast the quantum chaos expected in these mesoscopic ''solid-state atoms'' with that observed in Rydberg atoms in microwave fields, and discuss the prospects for experimental observation of the effects we predict.

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Держатели документа:
LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545
LV KIRENSKII INST PHYS,KRASNOYARSK 660036,RUSSIA
UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801
UKRAINIAN ACAD SCI,INST LOW TEMP PHYS & ENGN,UA-310164 KHARKOV,UKRAINE
ИФ СО РАН

Доп.точки доступа:
Berman, G. P.; Bulgakov, E. N.; Булгаков, Евгений Николаевич; Campbell, D. K.; Krive, I. V.
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Bulk acoustic waves propagation in Li2B4O7 piezoelectric crystals under the static uniaxial mechanical pressure / K. S. Aleksandrov [et al.] // Proceedings of the Annual IEEE International Frequency Control Symposium / Annual frequency control symposium (54 ; 2000 ; Jun. ; 7-9 ; Kansas, MO). - 2000. - P. 214-217. - Cited References: 8 . - ISBN 01616404
Кл.слова (ненормированные):
Acoustic wave transmission -- Acoustic wave velocity -- Elasticity -- Lithium compounds -- Mathematical models -- Permittivity -- Piezoelectricity -- Pressure effects -- Single crystals -- Electromechanical constants -- Piezoelectric crystal -- Piezoelectric materials
Аннотация: The influence of uniaxial mechanical stresses on bulk acoustic waves velocity in piezoelectric crystals Li2B4O7 has been investigated. Electromechanical constants have determined.

Scopus

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Turchin, P. P.; Sorokin, B. P.; Karpovich, A. A.; Nefedov, V. A.; Annual frequency control symposium(54 ; 2000 ; Jun. ; 7-9 ; Kansas, MO)
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Surface bonding states of nano-crystalline diamond balls / J. L. Peng [et al.] // Int. J. Mod. Phys. B. - 2001. - Vol. 15, Is. 31. - P. 4071-4085, DOI 10.1142/S0217979201007865. - Cited References: 20 . - ISSN 0217-9792

РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
PLASMON RESPONSE
   POWDER
   SPECTROSCOPY
   MICROSCOPY
   SILICON
   SI(111)
Кл.слова (ненормированные):
diamond -- article -- crystal structure -- electron -- energy transfer -- nanoparticle -- particulate matter -- structure analysis -- surface property -- transmission electron microscopy
Аннотация: The rough surface of nano-crystalline diamond spheres induces surface electronic states which appear as a broadened pre-peak over approx. 15 eV at the C K-edge energy threshold for carbon in the parallel electron energy loss spectrum (PEELS). This appears to be at least partially due to 1s-pi* transitions, although typically the latter occupy a range of only 4 eV for the sp(2) edge of highly-oriented pyrollytic graphite (HOPG). No pi* electrons appear in the conduction band inside the diamond particles, where all electrons are sp(3) hybridized. PEELS data were also obtained from a chemical vapour deposited diamond film (CVDF) and gem-quality diamond for comparison with the spectra of nano-diamonds. The density of sp(2) and sp(3) states on the surface of diamond nano-crystals is calculated for simple structural models of the diamond balls, including some conjecture about surface structures. The results are used to interpret the sp(2)/sp(3) ratios measured from the PEELS spectra recorded as scans across the particles. Surface roughness at the atomic scale was also examined using high-resolution transmission electron microscopy (HRTEM) and electron nano-diffraction patterns were used to confirm the crystal structures.

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Держатели документа:
RMIT Univ, Dept Appl Phys, Melbourne, Vic 3051, Australia
Univ Sydney, Electron Microscope Unit, Sydney, NSW 2006, Australia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Mol Architecture Grp, Krasnoyarsk 660036, Russia
Russian Acad Sci, Siberian Branch, Inst Biophys, Krasnoyarsk 660036, Russia
Univ Melbourne, Sch Phys, Parkville, Vic 3052, Australia
ИФ СО РАН
ИБФ СО РАН
Department of Applied Physics, RMIT University, Swanston Street, Melbourne, Vic. 3051, Australia
Electron Microscope Unit, University of Sydney, NSW 2006, Australia
Molecular Architecture Group, Kirensky Institute of Physics, Institute of Biophysics, 660036 Krasnoyarsk, Russian Federation
School of Physics, University of Melbourne, Parkville, Vic. 3010, Australia

Доп.точки доступа:
Peng, J. L.; Bulcock, S.; Belobrov, P. I.; Белобров, Петр Иванович; Bursill, L. A.
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Vetrov, S. Y.
Localized electromagnetic modes and the transmission spectrum of a one-dimensional photonic crystal with lattice defects / S. Y. Vetrov, A. V. Shabanov // J. Exp. Theor. Phys. - 2001. - Vol. 93, Is. 5. - P. 977-984, DOI 10.1134/1.1427109. - Cited References: 26 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
BAND-GAP
   SPONTANEOUS EMISSION
   SUPERLATTICES
   WAVES
   PROPAGATION
   LIGHT
   EDGE
Аннотация: The properties of localized electromagnetic modes in a one-dimensional photonic crystal with a structural defect layer were studied. The role of the defect was played by an anisotropic nematic liquid crystal layer. The frequency and the damping factor of defect modes were shown to substantially depend on the defect layer thickness and the orientation of the optical axis of the nematic. The transmission spectra of photonic crystals with one and two lattice defects were studied. Taking into account the special feature of nematic liquid crystals distinguishing them from usual crystals, namely, large permittivity anisotropy, it was shown that the transmission spectrum of the photonic crystal could be controlled by varying the orientation of the optical axis of the nematic, for instance, under the action of an external electric field. (C) 2001 MAIK "Nauka/Interperiodica".

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Держатели документа:
Krasnoyarsk State Tech Univ, Krasnoyarsk 660074, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Shabanov, A. V.; Шабанов, Александр Васильевич
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10.

Bulgakov, E. N.
Spin rotation for ballistic electron transmission induced by spin-orbit interaction / E. N. Bulgakov, A. F. Sadreev // Phys. Rev. B. - 2002. - Vol. 66, Is. 7. - Ст. 75331, DOI 10.1103/PhysRevB.66.075331. - Cited References: 18 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
2-DIMENSIONAL ELECTRONS
WAVE-GUIDES
TRANSPORT
Аннотация: We study spin-dependent electron transmission through one- and two-dimensional curved waveguides and quantum dots with account of spin-orbit interaction. We prove that for a transmission through an arbitrary structure there is no spin polarization provided the electron transmits in an isolated energy subband and only two leads are attached to the structure. In particular there is no spin polarization in the one-dimensional wire, for which a spin-dependent solution is found analytically. The solution demonstrates the spin evolution as dependent on a length of wire. The numerical solution for transmission of electrons through the two-dimensional curved waveguides coincides with the solution for the one-dimensional wire if the energy of electron is within the first energy subband. In the vicinity of edges of the energy subbands there are sharp anomalies of spin flipping.

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Держатели документа:
Russian Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia
Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden
ИФ СО РАН
Institute of Physics, Academy of Sciences, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
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