Excitons and optical absorption on the surface of a strong topological insulator with a magnetic energy gap

被引：40

作者：

Garate, Ion ^{[1
,2
]}

Franz, M. ^{[1
]}

机构：

[1] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[2] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 04期

关键词：

GAAS QUANTUM-WELLS;

D O I：

10.1103/PhysRevB.84.045403

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a theoretical study of interacting electron-hole pairs located on a magnetized surface of a strong topological insulator (TI). The excitonic energy levels and the optical absorption on such a surface display unique and potentially measurable features such as (i) an enhanced binding energy for excitons whose total angular momentum is aligned with the magnetic exchange field, (ii) a stark dependence of the optical absorption on the direction of the magnetic exchange field as well as on the chirality of the incident light, and (iii) a tunable center-of-mass motion of spinful excitons induced by particle-hole asymmetry in the exchange field. Our predictions are relevant to surfaces of magnetically doped TIs or surfaces coated with magnetic films, in addition to TI nanowires placed under longitudinal magnetic fields.

引用

页数：11

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