Abstract
Microcavity exciton-polaritons based on transition metal dichalcogenide monolayers (TMDs) are a promising platform for coherent valleytronics, exhibiting valley-dependent phenomena at roomerature. Using polarization-dependent transient reflectance, we demonstrate the valley-exclusive nature of the optical Stark effect in WS2 exciton-polaritons. We observe a simultaneous shift of both polariton branches when pump and probe are co-polarized and no appreciable shift when they are cross-polarized, demonstrating a polarization-selective stark shift in exciton-polaritons. This work highlights how the unique features of TMD exciton-polaritons can give rise to new polaritonic phenomena.
Original language | English (US) |
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Title of host publication | 2D Photonic Materials and Devices III |
Editors | Arka Majumdar, Carlos M. Torres, Hui Deng |
Publisher | SPIE |
ISBN (Electronic) | 9781510633278 |
DOIs | |
State | Published - 2020 |
Event | 2D Photonic Materials and Devices III 2020 - San Francisco, United States Duration: Feb 5 2020 → Feb 6 2020 |
Publication series
Name | Proceedings of SPIE - The International Society for Optical Engineering |
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Volume | 11282 |
ISSN (Print) | 0277-786X |
ISSN (Electronic) | 1996-756X |
Conference
Conference | 2D Photonic Materials and Devices III 2020 |
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Country/Territory | United States |
City | San Francisco |
Period | 2/5/20 → 2/6/20 |
Funding
The research described here has been supported by the U.S. Department of Energy, Oce of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award No. DE-SC0012130 (cavity excitonpolaritons) and the Oce of Naval Research under grant number N00014-16-1-3055 (ultrafast valley manipulation). This work utilized Northwestern University Micro/Nano Fabrication Facility (NUFAB), which is partially supported by Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205), the Materials Research Science and Engineering Center (DMR-1720139), the State of Illinois, and Northwestern University.
Keywords
- 2D Semiconductor
- Exciton-Polariton
- Optical Stark Effect
- Valleytronics
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering