Coherent and Incoherent Coupling Dynamics between Neutral and Charged Excitons in Monolayer MoSe2

被引：92

作者：

Hao, Kai ^{[1
,2
]}

Xu, Lixiang ^{[1
,2
]}

Nagler, Philipp ^{[3
]}

Singh, Akshay ^{[1
,2
]}

Kha Tran ^{[1
,2
]}

Dass, Chandriker Kavir ^{[1
,2
]}

Schueller, Christian ^{[3
]}

Korn, Tobias ^{[3
]}

Li, Xiaoqin ^{[1
,2
]}

Moody, Galan ^{[4
]}

机构：

[1] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

[2] Univ Texas Austin, Ctr Complex Quantum Syst, Austin, TX 78712 USA

[3] Univ Regensburg, Dept Phys, D-93040 Regensburg, Germany

[4] NIST, Boulder, CO 80305 USA

来源：

NANO LETTERS | 2016年 / 16卷 / 08期

基金：

美国国家科学基金会;

关键词：

Quantum beats; coherent coupling; exciton; trion; two-dimensional materials; QUANTUM BEATS; VALLEY COHERENCE; ENERGY-TRANSFER; LASER; PHOTOLUMINESCENCE; SEMICONDUCTOR; INTERFERENCE; TRANSITIONS; INVERSION; SPIN;

D O I：

10.1021/acs.nanolett.6b02041

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The optical properties of semiconducting transition metal dichalcogenides are dominated by both neutral excitons (electron hole pairs) and charged excitons (trions) that are stable even at room temperature. While trions directly influence charge transport properties in optoelectronic devices, excitons may be relevant through exciton-trion coupling and conversion phenomena. In this work, we reveal the coherent and incoherent nature of exciton-trion coupling and the relevant time scales in monolayer MoSe2 using optical two-dimensional coherent spectroscopy. Coherent interaction between excitons and trions is definitively identified as quantum beating of cross peaks in the spectra that persists for a few hundred femtoseconds. For longer times up to 10 ps, surprisingly, the relative intensity of the cross peaks increases, which is attributed to incoherent energy transfer likely due to phonon-assisted up-conversion and down-conversion processes that are efficient even at cryogenic temperature.

引用

页码：5109 / 5113

页数：5

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