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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Aksenov S. V., Ulanov E. A.
Заглавие : Inelastic tunnel transport of electrons through an anisotropic magnetic structure in an external magnetic field
Коллективы : Russian Foundation for Basic Research [13-02-00523, 13-02-98013, 14-02-31280]; Russian Federation [MK-526-526.2013.2, SP-6361.2013.5]
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 119, Is. 1. - P.124-137. - ISSN 1063-7761, DOI 10.1134/S1063776114060065. - ISSN 1090-6509
Примечания : Cited References: 35. - This work was performed under the Program "Quantum Mesoscopic and Disordered Systems" of the Presidium of the Russian Academy of Sciences and supported financially by the Russian Foundation for Basic Research (project nos. 13-02-00523, 13-02-98013, and 14-02-31280). The work of one of coauthors (S. V. A.) was supported by grant no. MK-526-526.2013.2 of the President of the Russian Federation and scholarship SP-6361.2013.5 of the President of the Russian Federation.
Предметные рубрики: SINGLE-MOLECULE
SPECTROSCOPY
ATOM
STATE
Аннотация: Quantum transport of electrons through a magnetic impurity located in an external magnetic field and affected by a substrate is considered using the Keldysh diagram technique for the Fermi and Hubbard operators. It is shown that in a strongly nonequilibrium state induced by multiple reflections of electrons from the impurity, the current-voltage (I-V) characteristic of the system contains segments with a negative conductivity. This effect can be controlled by varying the anisotropy parameter of the impurity center as well as the parameters of coupling between the magnetic impurity and metal contacts. The application of the magnetic field is accompanied by an increase in the number of Coulomb steps in the I-V curve of the impurity. The effect of appreciable magnetoresistance appears in this case. We demonstrate the possibility of switching between magnetic impurity states with different total spin projection values in the regime of asymmetric coupling of this impurity with the contacts.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Aksenov S. V., Ulanov E. A.
Заглавие : Quantum transport through a multilevel magnetic structure with multiple inelastic scattering in a magnetic field taken into account
Коллективы : Program of the Presidium of RAS "Quantum mesoscopic and disordered systems"; Russian Foundation for Basic Research [13-02-00523, 13-02-98013, 14-02-31280], Russian Federation [MK-526.2013.2, SP-6361.2013.5]
Место публикации : Low Temp. Phys.: American Institute of Physics, 2015. - Vol. 41, Is. 2. - P.98-105. - ISSN 1063, DOI 10.1063/1.4913204. - ISSN 10906517(eISSN)
Примечания : Cited References:33. - This work was supported by the Program of the Presidium of RAS "Quantum mesoscopic and disordered systems" and Russian Foundation for Basic Research (Grant Nos. 13-02-00523, 13-02-98013, and 14-02-31280).One of the authors (S.V.A.) is grateful to the grant of the President of the Russian Federation MK-526.2013.2 and the scholarship of the President of the Russian Federation SP-6361.2013.5 for the support.
Предметные рубрики: SINGLE-MOLECULE
SPECTROSCOPY
ATOM
ANISOTROPY
Аннотация: We present a solution for the problem of quantum electron transport through a magnetic atom adsorbed inside a break junction with paramagnetic metal electrodes. In agreement with experimental data, it was assumed that the conduction electrons experience inelastic scattering by the adsorbate due to s–d(f)-exchange interaction. The Keldysh technique was employed to obtain a general expression describing a current through the multilevel structure at finite temperatures in terms of the nonequilibrium Green's function. The use of the atomic representation allowed to exactly account for the non-equidistant structure of the energy spectrum of a magnetic atom and to simplify substantially the application of the Wick theorem for construction of the nonequilibrium diagrammatic technique for the Hubbard operators. The calculation of the current-voltage characteristics of the magnetic adatom in the tunnel regime at low temperatures revealed the presence of regions with a negative differential conductance in a magnetic field.
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