Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
The Nernst effect in Corbino geometry. / Kavokin, A. V.; Altshuler, B. L.; Sharapov, S. G.; Grigoryev, P. S.; Varlamov, A. A.
в: Proceedings of the National Academy of Sciences of the United States of America, Том 117, № 6, 11.02.2020, стр. 2846-2851.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - The Nernst effect in Corbino geometry
AU - Kavokin, A. V.
AU - Altshuler, B. L.
AU - Sharapov, S. G.
AU - Grigoryev, P. S.
AU - Varlamov, A. A.
N1 - Publisher Copyright: © 2020 National Academy of Sciences. All rights reserved.
PY - 2020/2/11
Y1 - 2020/2/11
N2 - We study the manifestation of the Nernst effect in the Corbino disk subjected to the normal external magnetic field and to the radial temperature gradient. The Corbino geometry offers a precious opportunity for the direct measurement of the magnetization currents that are masked by kinetic contributions to the Nernst current in the conventional geometry. The magnetization currents, also referred to as the edge currents, are independent on the conductivity of the sample which is why they can be conveniently described within the thermodynamic approach. They can be related to the Landau thermodynamic potential for an infinite system. We demonstrate that the observable manifestation of this, purely thermodynamic, Nernst effect consists in the strong oscillations of the magnetic field measured in the center of the disk as a function of the external field. The oscillations depend on the temperature difference at the edges of the disk. Dirac fermions and 2D electrons with a parabolic spectrum are characterized by oscillations of different phase and frequency. We predict qualitatively different power dependencies of the magnitude of the Nernst signal on the chemical potential for normal and Dirac carriers.
AB - We study the manifestation of the Nernst effect in the Corbino disk subjected to the normal external magnetic field and to the radial temperature gradient. The Corbino geometry offers a precious opportunity for the direct measurement of the magnetization currents that are masked by kinetic contributions to the Nernst current in the conventional geometry. The magnetization currents, also referred to as the edge currents, are independent on the conductivity of the sample which is why they can be conveniently described within the thermodynamic approach. They can be related to the Landau thermodynamic potential for an infinite system. We demonstrate that the observable manifestation of this, purely thermodynamic, Nernst effect consists in the strong oscillations of the magnetic field measured in the center of the disk as a function of the external field. The oscillations depend on the temperature difference at the edges of the disk. Dirac fermions and 2D electrons with a parabolic spectrum are characterized by oscillations of different phase and frequency. We predict qualitatively different power dependencies of the magnitude of the Nernst signal on the chemical potential for normal and Dirac carriers.
KW - Corbino disk
KW - Magnetic oscillations
KW - Nernst effect
UR - http://www.scopus.com/inward/record.url?scp=85079324011&partnerID=8YFLogxK
U2 - 10.1073/pnas.1916567117
DO - 10.1073/pnas.1916567117
M3 - Article
C2 - 31992642
AN - SCOPUS:85079324011
VL - 117
SP - 2846
EP - 2851
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
SN - 0027-8424
IS - 6
ER -
ID: 49363296