Exciton dynamics in WSe2 bilayers

被引：52

作者：

Wang, G. ^{[1
]}

Marie, X. ^{[1
]}

Bouet, L. ^{[1
]}

Vidal, M. ^{[1
]}

Balocchi, A. ^{[1
]}

Amand, T. ^{[1
]}

Lagarde, D. ^{[1
]}

Urbaszek, B. ^{[1
]}

机构：

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

来源：

APPLIED PHYSICS LETTERS | 2014年 / 105卷 / 18期

关键词：

FEW-LAYER MOS2; VALLEY POLARIZATION; MONO LAYER; SPIN; COHERENCE; WS2;

D O I：

10.1063/1.4900945

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigate exciton dynamics in WSe2 bilayers in time-resolved photoluminescence (PL) spectroscopy. Fast PL emission times are recorded for both the direct exciton with tau(D) less than or similar to 3 ps and the indirect optical transition with tau(I) approximate to 25 ps. For temperatures between 4 to 150K tau(I) remains constant. Following polarized laser excitation, we observe for the direct exciton transition at the K point of the Brillouin zone efficient optical orientation and alignment during the short emission time tau(D). The evolution of the direct exciton polarization and intensity as a function of excitation laser energy is monitored in PL excitation experiments. (C) 2014 AIP Publishing LLC.

引用

页数：4

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