Magnetic-breakdown oscillations of the thermoelectric field in layered conductors


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The response of an electron system to nonuniform heating of layered conductors with an arbitrary quasi-two-dimensional electron energy spectrum in a strong magnetic field B is investigated theoretically in the case when cyclotron frequency ωc is much higher than the frequency 1/τ of collisions between charge carriers. In the case of a multisheet Fermi surface (FS), we calculate the dependence of the thermoelectric coefficients on the magnitude and orientation of the magnetic field in the vicinity of the Lifshitz topological transition when the FS connectivity changes under the action of an external force (e.g., pressure) on the conductor. Upon a decrease in the spacing between individual pockets (sheets) of the FS, conduction electrons can tunnel as a result of the magnetic breakdown from one FS sheet to another; their motion over magneticbreakdown trajectories becomes complicated and entangled. The thermoelectric field exhibits a peculiar dependence on the magnetic field: for a noticeable deviation of vector B from the normal through angle ϑ to the layers, the thermoelectric field oscillates as a function of tanϑ. The period of these oscillations contains important information on the distance between individual FS sheets and their corrugation.

作者简介

V. Peschanskii

Karazin Kharkov National University; Verkin Institute for Low-Temperature Physics and Engineering

编辑信件的主要联系方式.
Email: vpeschansky@ilt.kharkov.ua
乌克兰, Kharkov, 61022; Kharkov, 61103

O. Galbova

St. Cyril and Methodium University

Email: vpeschansky@ilt.kharkov.ua
马其顿,前南斯拉夫共和国, Skopie, 1000

R. Hasan

Karazin Kharkov National University; Physics Department

Email: vpeschansky@ilt.kharkov.ua
乌克兰, Kharkov, 61022; Birzeit, West Bank

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