Transport Theory of Monolayer Transition-Metal Dichalcogenides through Symmetry

被引：221

作者：

Song, Yang ^{[1
]}

Dery, Hanan ^{[1
,2
]}

机构：

[1] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

[2] Univ Rochester, Dept Elect & Comp Engn, Rochester, NY 14627 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 02期

基金：

美国国家科学基金会;

关键词：

VALLEY POLARIZATION; MOS2; MOBILITY;

D O I：

10.1103/PhysRevLett.111.026601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a theory that elucidates the major momentum and spin relaxation processes for electrons, holes, and hot excitons in monolayer transition-metal dichalcogenides. We expand on spin flips induced by flexural phonons and show that the spin relaxation is ultrafast for electrons in free-standing membranes while being mitigated in supported membranes. This behavior due to interaction with flexural phonons is universal in two-dimensional membranes that respect mirror symmetry, and it leads to a counterintuitive inverse relation between mobility and spin relaxation.

引用

页数：5

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