Spatial extent of the excited exciton states in WS2 monolayers from diamagnetic shifts

Zipfel, Jonas; Holler, Johannes; Mitioglu, Anatolie A.; Ballottin, Mariana V.; Nagler, Philipp; Stier, Andreas V.; Taniguchi, Takashi; Watanabe, Kenji; Crooker, Scott A.; Christianen, Peter C. M.; Korn, Tobias; Chernikov, Alexey

doi:10.1103/PhysRevB.98.075438

Title: Spatial extent of the excited exciton states in ${WS}_{2}$ monolayers from diamagnetic shifts

Journal Article · Fri Aug 31 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.98.075438· OSTI ID:1471368

Zipfel, Jonas ^[1]; Holler, Johannes ^[1]; Mitioglu, Anatolie A. ^[2]; Ballottin, Mariana V. ^[2]; Nagler, Philipp ^[1];

^[3]; Taniguchi, Takashi ^[4]; Watanabe, Kenji ^[4];

^[3]; Christianen, Peter C. M. ^[2]; Korn, Tobias ^[1]; Chernikov, Alexey ^[1]

Univ. of Regensburg, Regensburg (Germany)
Radboud Univ., Nijmegen (The Netherlands)
National High Magnetic Field Lab., Los Alamos, NM (United States)
National Institute for Materials Science, Ibaraki (Japan)

Here, we experimentally study the radii of excitons in hBN-encapsulated WS₂ monolayers by means of magneto-optical reflectance spectroscopy at cryogenic temperatures in magnetic fields up to 29 T. We observe field-induced energy shifts of the exciton ground and excited states due to valley Zeeman and diamagnetic effects. We find the g factor of the first excited state of –4.2 ± 0.1 to be essentially equal to that of the ground state of –4.35 ± 0.1. From diamagnetic shifts, we determine the root mean square radii of the excitons. The radius of the first excited state is found to be 5–8 nm and that of the ground state around 2 nm. Our results further confirm the Wannier-Mott nature of the exciton quasiparticles in monolayer semiconductors and the assignment of the optical resonances in absorption-type measurements. They also provide additional support for the applicability of the effective mass hydrogenlike models in these systems.

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

Sponsoring Organization:: National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1471368

Report Number(s):: LA-UR-18-27842; PRBMDO

Journal Information:: Physical Review B, Vol. 98, Issue 7; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 37 works

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