Polarization and time-resolved photoluminescence spectroscopy of excitons in MoSe2 monolayers

被引：160

作者：

Wang, G. ^{[1
]}

Palleau, E. ^{[1
]}

Amand, T. ^{[1
]}

Tongay, S. ^{[2
]}

Marie, X. ^{[1
]}

Urbaszek, B. ^{[1
]}

机构：

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

[2] Arizona State Univ, Sch Engn Matter Transport & Energy, Tempe, AZ 85287 USA

来源：

APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 11期

关键词：

VALLEY POLARIZATION; SPIN DYNAMICS; COHERENCE; STATES;

D O I：

10.1063/1.4916089

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigate valley exciton dynamics in MoSe2 monolayers in polarization-and time-resolved photoluminescence (PL) spectroscopy at 4K. Following circularly polarized laser excitation, we record a low circular polarization degree of the PL of typically <= 5%. This is about 10 times lower than the polarization induced under comparable conditions in MoS2 and WSe2 monolayers. The evolution of the exciton polarization as a function of excitation laser energy and power is monitored in PL excitation experiments. Fast PL emission times are recorded for both the neutral exciton of <= 3 ps and for the charged exciton (trion) of 12 ps. (C) 2015 AIP Publishing LLC.

引用

页数：4

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