Impact of substrates and quantum effects on exciton line shapes of 2D semiconductors at room temperature

van de Groep, Jorik; Li, Qitong; Song, Jung-Hwan; Kik, Pieter G.; Brongersma, Mark L.

doi:10.1515/nanoph-2023-0193

Impact of substrates and quantum effects on exciton line shapes of 2D semiconductors at room temperature

Journal Article · Tue Jun 20 00:00:00 EDT 2023 · Nanophotonics (Online)

DOI:https://doi.org/10.1515/nanoph-2023-0193· OSTI ID:2420985

^[1]; Li, Qitong ^[2]; Song, Jung-Hwan ^[2]; Kik, Pieter G. ^[3]; ^[2]

Stanford Univ., CA (United States); Univ. of Amsterdam (Netherlands); University of Amsterdam, Amsterdam (The Netherlands)
Stanford Univ., CA (United States)
Univ. of Central Florida, Orlando, FL (United States)

Exciton resonances in monolayer transition-metal dichalcogenides (TMDs) provide exceptionally strong light–matter interaction at room temperature. Their spectral line shape is critical in the design of a myriad of optoelectronic devices, ranging from solar cells to quantum information processing. However, disorder resulting from static inhomogeneities and dynamical fluctuations can significantly impact the line shape. Many recent works experimentally evaluate the optical properties of TMD monolayers placed on a substrate and the line shape is typically linked directly to the material’s quality. Here, we highlight that the interference of the substrate and TMD reflections can strongly influence the line shape. We further show how basic, room-temperature reflection measurements allow investigation of the quantum mechanical exciton dynamics by systematically controlling the substrate reflection with index-matching oils. By removing the substrate contribution with properly chosen oil, we can extract the excitonic decay rates including the quantum mechanical dephasing rate. The results provide valuable guidance for the engineering of exciton line shapes in layered nanophotonic systems.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Photonics at Thermodynamic Limits (PTL); Stanford Univ., CA (United States)

Sponsoring Organization:: National Research Foundation of Korea (NRF); National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC)

Grant/Contract Number:: SC0019140

OSTI ID:: 2420985

Journal Information:: Nanophotonics (Online), Journal Name: Nanophotonics (Online) Journal Issue: 16 Vol. 12; ISSN 2192-8614

Publisher:: de GruyterCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Impact of substrates and quantum effects on exciton line shapes of 2D semiconductors at room temperature

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