Exciton-exciton annihilation in MoSe2 monolayers

被引：330

作者：

Kumar, Nardeep ^{[1
]}

Cui, Qiannan ^{[1
]}

Ceballos, Frank ^{[1
]}

He, Dawei ^{[2
]}

Wang, Yongsheng ^{[2
]}

Zhao, Hui ^{[1
]}

机构：

[1] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA

[2] Beijing Jiaotong Univ, Inst Optoelect Technol, Minist Educ, Key Lab Luminescence & Opt Informat, Beijing 100044, Peoples R China

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 12期

基金：

美国国家科学基金会;

关键词：

VALLEY POLARIZATION; INTEGRATED-CIRCUITS; COHERENCE;

D O I：

10.1103/PhysRevB.89.125427

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the excitonic dynamics in MoSe2 monolayer and bulk samples by femtosecond transient absorption. Excitons are resonantly injected by a 750-nm and 100-fs laser pulse, and are detected by measuring a differential reflection of a probe pulse tuned in the range 790-820 nm. We observe a strong density-dependent initial decay of the exciton population in monolayers, which can be well described by the exciton-exciton annihilation. Such a feature is not observed in a bulk sample under comparable conditions. We also observe the saturated absorption induced by excitons in both monolayers and the bulk in the differential reflection measurements, which indicates their potential applications as saturable absorbers.

引用

页数：6

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