The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation

被引：175

作者：

Ruppert, Claudia ^{[1
,2
,3
]}

Chernikov, Alexey ^{[1
,2
,4
]}

Hill, Heather M. ^{[1
,2
,5
,6
]}

Rigosi, Albert F. ^{[1
,2
,5
,6
]}

Heinz, Tony F. ^{[1
,2
,5
,6
]}

机构：

[1] Columbia Univ, Dept Phys, New York, NY 10027 USA

[2] Columbia Univ, Dept Elect Engn, New York, NY 10027 USA

[3] Tech Univ Dortmund, Dept Phys, D-44227 Dortmund, Germany

[4] Univ Regensburg, Dept Phys, D-93053 Regensburg, Germany

[5] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[6] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

来源：

NANO LETTERS | 2017年 / 17卷 / 02期

基金：

美国国家科学基金会;

关键词：

Atomically thin 2D materials; ultrafast spectroscopy; carrier and phonon dynamics; FEW-LAYER MOS2; MONO LAYER; BANDGAP RENORMALIZATION; EXCITON DYNAMICS; VALLEY; COHERENCE; SPIN; PHOTOLUMINESCENCE; TRANSITIONS; GENERATION;

D O I：

10.1021/acs.nanolett.6b03513

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Transient changes of the optical response of WS2 monolayers are studied by femtosecond broadband pump probe spectroscopy. Time-dependent absorption spectra are analyzed by tracking the line width broadening, bleaching, and energy shift of the main exciton resonance as a function of time delay after the excitation. Two main sources for the pump-induced changes of the optical response are identified. Specifically, we find an interplay between modifications induced by many-body interactions from photoexcited carriers and by the subsequent transfer of the excitation to the phonon system followed by cooling of the material through the heat transfer to the substrate.

引用

页码：644 / 651

页数：8

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