A Cantilever Torque Magnetometry Method for the Measurement of Hall Conductivity of Highly Resistive Samples

Mumford, Samuel; Paul, Tiffany; Lee, Seung Hwan; Yacoby, Amir; Kapitulnik, A.

doi:10.48550/arxiv.1908.10857

Cited by 1 publication

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“…For the recent experimental work on the measurement of the Hall conductivity in Corbino geometry by a sensible magnetometer we refer the reader to Ref. (35). We show that this field experiences pronounced unharmonic oscillations as a function of the external field B.…”

Section: Significance Statementmentioning

confidence: 70%

The Nernst effect in Corbino geometry

Kavokin

Altshuler

Sharapov

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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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. Nernst effect | Corbino disk| magnetic oscillationsA Corbino disk represents one of the most important exper-

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Section: Significance Statementmentioning

confidence: 70%