Exciton fine structure and spin decoherence in monolayers of transition metal dichalcogenides

被引：260

作者：

Glazov, M. M. ^{[1
]}

Amand, T. ^{[2
]}

Marie, X. ^{[2
]}

Lagarde, D. ^{[2
]}

Bouet, L. ^{[2
]}

Urbaszek, B. ^{[2
]}

机构：

[1] RAS, Ioffe Phys Tech Inst, St Petersburg 194021, Russia

[2] Univ Toulouse, INSA CNRS UPS, LPCNO, F-31077 Toulouse, France

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 20期

关键词：

VALLEY POLARIZATION; DYNAMICS; MOS2;

D O I：

10.1103/PhysRevB.89.201302

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the neutral exciton energy spectrum fine structure and its spin dephasing in transition metal dichalcogenides such as MoS2. The interaction of the mechanical exciton with its macroscopic longitudinal electric field is taken into account. The splitting between the longitudinal and transverse excitons is calculated by means of the both electrodynamical approach and k center dot p perturbation theory. This long-range exciton exchange interaction can induce valley polarization decay. The estimated exciton spin dephasing time is in the picosecond range, in agreement with available experimental data.

引用

页数：5

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