Phonon-drag magnetothermopower in Rashba spin-split two-dimensional electron systems
Abstract
We study phonon-drag contribution to the thermoelectric power in a quasi-two-dimensional electron system confined in GaAs/AlGaAs heterostructure in presence of both Rashba spin-orbit interaction and perpendicular magnetic field at very low temperature. It is observed that the peaks in the phonon-drag thermopower split into two when the Rashba spin-orbit coupling constant is strong. This splitting is a direct consequence of the Rashba spin-orbit interaction. We show the dependence of phonon-drag thermopower on both magnetic field and temperature numerically. A power-law dependence of phonon-drag magnetothermopower on the temperature in the Bloch-Gruneisen regime is found. We also extract the exponent of the temperature dependence of phonon-drag thermopower for different parameters like electron density, magnetic field, and the spin-orbit coupling constant.
Keywords
Cite
@article{arxiv.1305.3745,
title = {Phonon-drag magnetothermopower in Rashba spin-split two-dimensional electron systems},
author = {Tutul Biswas and Tarun Kanti Ghosh},
journal= {arXiv preprint arXiv:1305.3745},
year = {2013}
}