Atomlike Interaction and Optically Tunable Giant Band-Gap Renormalization in Large-Area Atomically Thin MoS2

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

Research output: Contribution to journalArticlepeer-review

16 Scopus Citations

Abstract

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.

Original languageAmerican English
Article numberArticle No. L201404
Number of pages6
JournalPhysical Review B
Volume104
Issue number20
DOIs
StatePublished - 15 Nov 2021

Bibliographical note

Publisher Copyright:
© 2021 American Physical Society.

NREL Publication Number

  • NREL/JA-5900-79661

Keywords

  • 2D semiconductors
  • solar-photochemistry

Fingerprint

Dive into the research topics of 'Atomlike Interaction and Optically Tunable Giant Band-Gap Renormalization in Large-Area Atomically Thin MoS2'. Together they form a unique fingerprint.

Cite this