拓扑绝缘体 Bi2Te3 的磁热输运测量中的量子振荡。

Quantum oscillations in magnetothermopower measurements of the topological insulator Bi2Te3.

机构信息

Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

出版信息

Phys Rev Lett. 2012 Dec 14;109(24):246602. doi: 10.1103/PhysRevLett.109.246602. Epub 2012 Dec 10.

DOI:10.1103/PhysRevLett.109.246602

Abstract

We report the magnetothermopower measurements of the nonmetallic topological insulator Bi(2)Te(3) in magnetic fields up to 35 T. Quantum oscillations arising from surface states are observed in both thermoelectric and conductivity tensors. The inferred surface thermopower has a peak magnitude ~1 mV/K possibly as a result of surface electron and bulk phonon interaction. At the n = 1 Landau level, we resolve additional quantum oscillations signaling Landau sublevels.

摘要

我们报告了非金属拓扑绝缘体 Bi(2)Te(3)在高达 35 T 的磁场中的磁热功率测量结果。在热电和电导率张量中都观察到了源于表面态的量子振荡。推断出的表面热功率具有约 1 mV/K 的峰值幅度，这可能是由于表面电子和体声子相互作用的结果。在 n = 1 朗道能级，我们分辨出了表明朗道亚能级的附加量子振荡。