Disentangling the magnetoelectric and thermoelectric transport in topological insulator thin films

Article

关键词: SINGLE DIRAC CONE;    PERFORMANCE;    DISTORTION;    BI2SE3;    POWER;   

DOI  :  10.1103/PhysRevB.91.075431

来源: SCIE

【 摘 要 】

We report transport studies on (Bi1-x Sb-x)(2)Te-3 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.

【 授权许可】

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