Transport Theory of Monolayer Transition-Metal Dichalcogenides through Symmetry

被引：212
|
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.
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页数：5
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