Femtosecond exciton dynamics in WSe2 optical waveguides

被引：36

作者：

Sternbach, Aaron J. ^{[1
]}

Latini, Simone ^{[2
]}

Chae, Sanghoon ^{[3
]}

Huebener, Hannes ^{[2
]}

De Giovannini, Umberto ^{[2
]}

Shao, Yinming ^{[1
]}

Xiong, Lin ^{[1
]}

Sun, Zhiyuan ^{[1
]}

Shi, Norman ^{[1
]}

Kissin, Peter ^{[4
]}

Ni, Guang-Xin ^{[1
]}

Rhodes, Daniel ^{[3
]}

Kim, Brian ^{[3
]}

Yu, Nanfang ^{[1
]}

Millis, Andrew J. ^{[1
]}

Fogler, Michael M. ^{[4
]}

Schuck, Peter J. ^{[3
]}

Lipson, Michal ^{[5
]}

Zhu, X-Y ^{[6
]}

Hone, James ^{[3
]}

Averitt, Richard D. ^{[4
]}

Rubio, Angel ^{[2
,7
]}

Basov, D. N. ^{[1
]}

机构：

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

[2] Max Planck Inst Struct & Dynam Matter, Luruper Chaussee 149, D-22761 Hamburg, Germany

[3] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA

[4] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

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

[6] Columbia Univ, Dept Chem, New York, NY 10027 USA

[7] Flatiron Inst, Ctr Computat Quantum Phys CCQ, 162 Fifth Ave, New York, NY 10010 USA

来源：

NATURE COMMUNICATIONS | 2020年 / 11卷 / 01期

基金：

欧洲研究理事会;

关键词：

SPECTROSCOPY; POLARITONS;

D O I：

10.1038/s41467-020-17335-w

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Van-der Waals (vdW) atomically layered crystals can act as optical waveguides over a broad range of the electromagnetic spectrum ranging from Terahertz to visible. Unlike common Si-based waveguides, vdW semiconductors host strong excitonic resonances that may be controlled using non-thermal stimuli including electrostatic gating and photoexcitation. Here, we utilize waveguide modes to examine photo-induced changes of excitons in the prototypical vdW semiconductor, WSe2, prompted by femtosecond light pulses. Using time-resolved scanning near-field optical microscopy we visualize the electric field profiles of waveguide modes in real space and time and extract the temporal evolution of the optical constants following femtosecond photoexcitation. By monitoring the phase velocity of the waveguide modes, we detect incoherent A-exciton bleaching along with a coherent optical Stark shift in WSe2.

引用

页数：6

共 31 条

[1] Nano-optical imaging and spectroscopy of order, phases, and domains in complex solids [J].