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

Journal Article · · 2D Materials
 [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)

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1376528
Journal Information:
2D Materials, Vol. 4, Issue 2; ISSN 2053-1583
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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Cited By (6)

Dissociation of two-dimensional excitons in monolayer WSe2 journal April 2018
Upconverted electroluminescence via Auger scattering of interlayer excitons in van der Waals heterostructures journal May 2019
2D semiconductor nonlinear plasmonic modulators journal July 2019
Probing the exciton k-space dynamics in monolayer tungsten diselenides journal March 2019
Ultrafast nonequilibrium dynamics of strongly coupled resonances in the intrinsic cavity of W S 2 nanotubes journal October 2019
Moiré excitons: From programmable quantum emitter arrays to spin-orbit–coupled artificial lattices journal November 2017