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24 April 2024

» arxiv » 1502.7794

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Disentangling the magnetoelectric and thermoelectric transport in topological insulator thin films
Jinsong Zhang ; Xiao Feng ; Yong Xu ; Minghua Guo ; Zuocheng Zhang ; Yunbo Ou ; Yang Feng ; Kang Li ; Haijun Zhang ; Lili Wang ; Xi Chen ; Zhongxue Gan ; Shou-Cheng Zhang ; Ke He ; Xucun Ma ; Qi-Kun Xue ; Yayu Wang ;
Date:	27 Feb 2015
Abstract:	We report transport studies on (Bi,Sb)2Te3 topological insulator thin films with tunable electronic band structure. We find a doping and temperature regime in which the Hall coefficient is negative indicative of electron-type carriers, whereas the Seebeck coefficient is positive indicative of hole-type carriers. This sign anomaly is due to the distinct transport behaviors of the bulk and surface states: the surface Dirac fermions dominate magnetoelectric transport while the thermoelectric effect is mainly determined by the bulk states. These findings may inspire new ideas for designing topological insulator-based high efficiency thermoelectric devices.
Source:	arXiv, 1502.7794
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