Probing the influence of dielectric environment on excitons in monolayer WSe2: Insight from high magnetic fields

Stier, Andreas V.; Wilson, Nathan P.; Clark, Genevieve; Xu, Xiaodong; Crooker, Scott A.

doi:10.1021/acs.nanolett.6b03276

Title: Probing the influence of dielectric environment on excitons in monolayer WSe₂: Insight from high magnetic fields

Journal Article · Wed Nov 09 00:00:00 EST 2016 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.6b03276· OSTI ID:1334154

^[1]; Wilson, Nathan P. ^[2]; Clark, Genevieve ^[2]; Xu, Xiaodong ^[2]; Crooker, Scott A. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Washington, Seattle, WA (United States)

Excitons in atomically thin semiconductors necessarily lie close to a surface, and therefore their properties are expected to be strongly influenced by the surrounding dielectric environment. However, systematic studies exploring this role are challenging, in part because the most readily accessible exciton parameter—the exciton’s optical transition energy—is largely unaffected by the surrounding medium. Here we show that the role of the dielectric environment is revealed through its systematic influence on the size of the exciton, which can be directly measured via the diamagnetic shift of the exciton transition in high magnetic fields. Using exfoliated WSe₂ monolayers affixed to single-mode optical fibers, we tune the surrounding dielectric environment by encapsulating the flakes with different materials and perform polarized low-temperature magneto-absorption studies to 65 T. The systematic increase of the exciton’s size with dielectric screening, and concurrent reduction in binding energy (also inferred from these measurements), is quantitatively compared with leading theoretical models. Furthermore, these results demonstrate how exciton properties can be tuned in future 2D optoelectronic devices.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1334154

Report Number(s):: LA-UR-16-27435

Journal Information:: Nano Letters, Vol. 16, Issue 11; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 160 works

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Dependence of the magnetic interactions in MoS$_2$ monolayer on Mn-doping configurations Smiri, Adlen; Gerber, Iann; Lounis, Samir arXiv https://doi.org/10.48550/arxiv.1904.12905	text	January 2019
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Magneto-spectroscopy of exciton Rydberg states in a CVD grown WSe2 monolayer Delhomme, A.; Butseraen, G.; Zheng, B. arXiv https://doi.org/10.48550/arxiv.1906.03013	text	January 2019
The impact of hexagonal boron nitride encapsulation on the structural and vibrational properties of few layer black phosphorus Birowska, Magdalena; Urban, Joanna; Baranowski, Michał arXiv https://doi.org/10.48550/arxiv.2002.10180	text	January 2020
Colloquium : Excitons in atomically thin transition metal dichalcogenides Wang, Gang; Chernikov, Alexey; Glazov, Mikhail M. Universität Regensburg https://doi.org/10.5283/epub.40518	text	January 2018

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Title: Probing the influence of dielectric environment on excitons in monolayer WSe2: Insight from high magnetic fields

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Title: Probing the influence of dielectric environment on excitons in monolayer WSe₂: Insight from high magnetic fields