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Title: Many-body effects in nonlinear optical responses of 2D layered semiconductors

Abstract

We performed ultrafast degenerate pump-probe spectroscopy on monolayer WSe2 near its exciton resonance. The observed differential reflectance signals exhibit signatures of strong many-body interactions including the exciton-exciton interaction and free carrier induced band gap renormalization. The exciton-exciton interaction results in a resonance blue shift which lasts for the exciton lifetime (several ps), while the band gap renormalization manifests as a resonance red shift with several tens ps lifetime. Our model based on the many-body interactions for the nonlinear optical susceptibility ts well the experimental observations. The power dependence of the spectra shows that with the increase of pump power, the exciton population increases linearly and then saturates, while the free carrier density increases superlinearly, implying that exciton Auger recombination could be the origin of these free carriers. Our model demonstrates a simple but efficient method for quantitatively analyzing the spectra, and indicates the important role of Coulomb interactions in nonlinear optical responses of such 2D materials.

Authors:
 [1];  [2];  [1];  [3];  [3];  [1];  [2];  [1]
  1. Univ. of Washington, Seattle, WA (United States)
  2. Univ. of Hong Kong (China)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1376528
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
2D Materials
Additional Journal Information:
Journal Volume: 4; Journal Issue: 2; Journal ID: ISSN 2053-1583
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Aivazian, Grant, Yu, Hongyi, Wu, Sanfeng, Yan, Jiaqiang, Mandrus, David G., Cobden, David, Yao, Wang, and Xu, Xiaodong. Many-body effects in nonlinear optical responses of 2D layered semiconductors. United States: N. p., 2017. Web. doi:10.1088/2053-1583/aa56f1.
Aivazian, Grant, Yu, Hongyi, Wu, Sanfeng, Yan, Jiaqiang, Mandrus, David G., Cobden, David, Yao, Wang, & Xu, Xiaodong. Many-body effects in nonlinear optical responses of 2D layered semiconductors. United States. https://doi.org/10.1088/2053-1583/aa56f1
Aivazian, Grant, Yu, Hongyi, Wu, Sanfeng, Yan, Jiaqiang, Mandrus, David G., Cobden, David, Yao, Wang, and Xu, Xiaodong. Thu . "Many-body effects in nonlinear optical responses of 2D layered semiconductors". United States. https://doi.org/10.1088/2053-1583/aa56f1. https://www.osti.gov/servlets/purl/1376528.
@article{osti_1376528,
title = {Many-body effects in nonlinear optical responses of 2D layered semiconductors},
author = {Aivazian, Grant and Yu, Hongyi and Wu, Sanfeng and Yan, Jiaqiang and Mandrus, David G. and Cobden, David and Yao, Wang and Xu, Xiaodong},
abstractNote = {We performed ultrafast degenerate pump-probe spectroscopy on monolayer WSe2 near its exciton resonance. The observed differential reflectance signals exhibit signatures of strong many-body interactions including the exciton-exciton interaction and free carrier induced band gap renormalization. The exciton-exciton interaction results in a resonance blue shift which lasts for the exciton lifetime (several ps), while the band gap renormalization manifests as a resonance red shift with several tens ps lifetime. Our model based on the many-body interactions for the nonlinear optical susceptibility ts well the experimental observations. The power dependence of the spectra shows that with the increase of pump power, the exciton population increases linearly and then saturates, while the free carrier density increases superlinearly, implying that exciton Auger recombination could be the origin of these free carriers. Our model demonstrates a simple but efficient method for quantitatively analyzing the spectra, and indicates the important role of Coulomb interactions in nonlinear optical responses of such 2D materials.},
doi = {10.1088/2053-1583/aa56f1},
journal = {2D Materials},
number = 2,
volume = 4,
place = {United States},
year = {Thu Jan 05 00:00:00 EST 2017},
month = {Thu Jan 05 00:00:00 EST 2017}
}

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Cited by: 33 works
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Works referencing / citing this record:

Dissociation of two-dimensional excitons in monolayer WSe2
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Upconverted electroluminescence via Auger scattering of interlayer excitons in van der Waals heterostructures
journal, May 2019


2D semiconductor nonlinear plasmonic modulators
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Probing the exciton k-space dynamics in monolayer tungsten diselenides
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Ultrafast nonequilibrium dynamics of strongly coupled resonances in the intrinsic cavity of W S 2 nanotubes
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Upconverted electroluminescence via Auger scattering of interlayer excitons in van der Waals heterostructures
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2D semiconductor nonlinear plasmonic modulators
journal, July 2019