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Condensed Matter > Materials Science
Title: Seebeck Coefficient of Two-dimensional Dirac Electrons in Organic Conductor under Pressure
(Submitted on 2 Nov 2022 (v1), last revised 10 May 2023 (this version, v2))
Abstract: The Seebeck coefficient, which is proportional to a ratio of the thermoelectric conductivity to electrical conductivity has been examined for Dirac electrons in the organic conductor $\alpha$-(BEDT-TTF)$_2$I$_3$ [BEDT-TTF denotes a molecule given by bis(ethylenedithio)tetrathiafulvalene] under a uniaxial pressure using a two-dimensional tight-binding model with both impurity and electron--phonon (e--p) scatterings. We calculate an anomalous temperature ($T$) dependence of the Seebeck coefficient $S_{\nu}$ with $\nu = x$ (perpendicular to the molecular stacking axis) and $y$, which shows $S_\nu > 0$ with a maximum at high temperatures and $S_{\nu} < 0$ with a minimum at low temperatures.The microscopic mechanism of such a sign change of $S_\nu$ is clarified in terms of the spectral conductivity. The result is compared with experiments on $\alpha$-(BEDT-TTF)$_2$I$_3$.
Submission history
From: Yoshikazu Suzumura [view email][v1] Wed, 2 Nov 2022 09:13:24 GMT (390kb)
[v2] Wed, 10 May 2023 05:41:45 GMT (435kb)
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