Atomlike interaction and optically tunable giant band-gap renormalization in large-area atomically thin MoS2

Bera, Santu K.; Shrivastava, Meghanns; Bramhachari, Khamari; Zhang, Hanyu; Poonia, Ajay K.; Mandal, Dipendranath; Miller, Elisa M.; Beard, Matthew C.; Agarwal, Amit; Adarsh, K. V.

doi:10.1103/physrevb.104.l201404

Title: Atomlike interaction and optically tunable giant band-gap renormalization in large-area atomically thin MoS2

Journal Article · 11 November 2021 · Physical Review B

DOI: https://doi.org/10.1103/physrevb.104.l201404 · OSTI ID:1832860

Bera, Santu K. ^[1]; Shrivastava, Meghanns ^[1]; Bramhachari, Khamari ^[2]; Zhang, Hanyu ^[3]; Poonia, Ajay K. ^[1]; Mandal, Dipendranath ^[1]; Miller, Elisa M. ^[3];

^[3]; Agarwal, Amit ^[2];

^[1]

Indian Inst. of Science Education and Research, Bhopal (India)
Indian Inst. of Technology (IIT), Kanpur (India)
National Renewable Energy Lab. (NREL), Golden, CO (United States)

Coulomb interactions in atomically thin transition metal dichalcogenides can be dynamically engineered by exploiting the dielectric environment to control the optical and electronic properties. Here we demonstrate an optically tunable giant band-gap renormalization (BGR) ~1200 and 850 meV from the edge of the conduction band and complete suppression of the exciton absorption in large-area single-layer (1L) and three-layer (3L) MoS2, respectively. The observed giant BGR is two orders of magnitude larger than that in the conventional semiconductors, and it persists for tens of ps. Strikingly, our results demonstrate photoinduced transparency at the electronic band gap using an intense optical field at room temperature. Exciton bleach recovery in 1L and 3L show a contrasting fluence-dependent response, demonstrating the layer-dependent optical tuning of exciton lifetime in a way that would be both reversible and real time. We find that the optical band gap (exciton resonance peak) shows a transient redshift followed by an anomalous blueshift from the lowest energy point as a function of the photo-generated carrier density. The observed exciton energy shift is analogous to atom-atom interactions, and it varies as a Lennard-Jones like potential as a function of the interexciton separation.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

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

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1832860

Report Number(s):: NREL/JA-5900-79661; MainId:35882; UUID:21da61b0-b668-478b-8290-8d8bc429c53a; MainAdminID:63268; TRN: US2216795

Journal Information:: Physical Review B, Vol. 104, Issue 20; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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