Strain tuning of excitons in monolayer
Abstract
Here, we investigate excitonic absorption and emission in monolayer (1L) WSe2 under tensile strain. We observe a redshift of 100 meV in the A exciton energy and a decrease of 25 meV in its estimated binding energy under 2.1% strain. Surprisingly, the linewidth of the A exciton decreases by almost a factor of two under strain, from 42 to 24 meV at room temperature. We explain this effect as the result of suppression of phonon-mediated exciton scattering channels. We show that such a suppression results from the relative shift under strain of a secondary valley in the conduction band that is nearly degenerate with the K valley where the A exciton is formed.
- Authors:
-
- Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1562880
- Alternate Identifier(s):
- OSTI ID: 1474105; OSTI ID: 1474195
- Grant/Contract Number:
- DMR-1420634; AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 98; Journal Issue: 11; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY; excitons; phonons; 2-dimensional systems; transition-metal dichalcogenides; monolayer films; optical absorption and photoluminescence spectroscopy; strain engineering
Citation Formats
Aslan, Ozgur Burak, Deng, Minda, and Heinz, Tony F. Strain tuning of excitons in monolayer WSe2. United States: N. p., 2018.
Web. doi:10.1103/physrevb.98.115308.
Aslan, Ozgur Burak, Deng, Minda, & Heinz, Tony F. Strain tuning of excitons in monolayer WSe2. United States. https://doi.org/10.1103/physrevb.98.115308
Aslan, Ozgur Burak, Deng, Minda, and Heinz, Tony F. Thu .
"Strain tuning of excitons in monolayer WSe2". United States. https://doi.org/10.1103/physrevb.98.115308. https://www.osti.gov/servlets/purl/1562880.
@article{osti_1562880,
title = {Strain tuning of excitons in monolayer WSe2},
author = {Aslan, Ozgur Burak and Deng, Minda and Heinz, Tony F.},
abstractNote = {Here, we investigate excitonic absorption and emission in monolayer (1L) WSe2 under tensile strain. We observe a redshift of 100 meV in the A exciton energy and a decrease of 25 meV in its estimated binding energy under 2.1% strain. Surprisingly, the linewidth of the A exciton decreases by almost a factor of two under strain, from 42 to 24 meV at room temperature. We explain this effect as the result of suppression of phonon-mediated exciton scattering channels. We show that such a suppression results from the relative shift under strain of a secondary valley in the conduction band that is nearly degenerate with the K valley where the A exciton is formed.},
doi = {10.1103/physrevb.98.115308},
journal = {Physical Review B},
number = 11,
volume = 98,
place = {United States},
year = {2018},
month = {9}
}
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Cited by: 7 works
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Figures / Tables:
FIG. 1: (a) Absorption spectra of 2.1% strained and unstrained 1L WSe2. (b) Strain-dependent PL spectra of 1L WSe2 (offset). Strain dependence of the strength of (c) absorption and (d) PL due to the $A$1s exciton; (e) $E$2s−1s , and A exciton binding energy; (f) $E$B−A. Hollow circles are datamore »
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