Thermal and electrical quantum Hall effects in ferromagnet/topological insulator/ferromagnet junction
Year: 2015
Type: article
Abstract: We present a theoretical description for a class of experimental setups that measure quantum Hall coefficients in ferromagnet/topological insulator/ferromagnet (FM-TI-FM) junctions. We predict that, varying the magnetization direction in ferromagnets, one can change the induced Hall voltage and transverse temperature gradient from the maximal values, corresponding to the quantized Hall coefficients, down to their complete suppression to zero. We provide detailed analysis of thermal and electrical Hall resistances as functions of the magnetization directions in ferromagnets, the spin scattering time in TI, and geometrical positions of FM leads and measurement contacts. We find a special symmetric configuration of the experimental setup, at which the quantum Hall coefficients are independent of spin scattering.
Source: Physical Review B
Authors: A. L. Chudnovskiy, V. Kagalovsky
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: Deutsche Forschungsgemeinschaft
OpenAlex ID: W1606643611