- Physical Review Journals
All JournalsPhysics Magazine

Physical Review B

Export citation

Export citation

Choose format for download:

Download Citation
  • Letter

Exciton-driven renormalization of quasiparticle band structure in monolayer MoS2

Yi Lin1,*, Yang-hao Chan1,†, Woojoo Lee2, Li-Syuan Lu4,5, Zhenglu Li1, Wen-Hao Chang4,5, Chih-Kang Shih2, Robert A. Kaindl1,‡, Steven G. Louie1,3 et al.

Alessandra Lanzara1,3,§

  • 1Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 2Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA
  • 3Department of Physics, University of California, Berkeley, California 94720, USA
  • 4Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
  • 5Research Center for Applied Sciences, Academia Sinica, Nankang, Taipei 11529, Taiwan

  • *yilin@lbl.gov
  • †Current address: Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan.
  • ‡Current address: Department of Physics and CXFEL Laboratory, Arizona State University, Tempe, Arizona 85287, USA.
  • §ALanzara@lbl.gov
PDF

Phys. Rev. B 106, L081117 – Published 18 August, 2022

DOI: https://doi.org/10.1103/PhysRevB.106.L081117

Abstract

Optical excitation serves as a powerful approach to control the electronic structure of layered van der Waals materials via many-body screening effects, induced by photoexcited free carriers, or via light-driven coherence, such as optical Stark and Bloch-Siegert effects. Although theoretical work has also pointed to an exotic mechanism of renormalizing band structure via excitonic correlations in bound electron-hole pairs (excitons), experimental observation of such exciton-driven band renormalization and the full extent of their implications is still lacking, largely due to the limitations of optical probes and the impact of screening effects. Here, by using extreme-ultraviolet time-resolved angle-resolved photoemission spectroscopy together with excitonic many-body theoretical calculations, we directly unmask the band renormalization effects driven by excitonic correlations in a monolayer semiconductor. We revealed a surprising bandgap opening, increased by 40 meV, and a simultaneous enhancement of band effective mass. Our findings unmask the exciton-driven mechanism toward the band engineering in photoexcited semiconducting materials, opening a playground to manipulate the transient energy states in layered quantum materials via optical controls of excitonic many-body correlations.

View figure in article

Physics Subject Headings (PhySH)

Authorization Required

We need you to provide your credentials before accessing this content.
Article Available via CHORUS
Download Accepted Manuscript

Other Options

Supplemental Material (Subscription Required)

References (Subscription Required)

Outline

Information

Phys. Rev. B 106, L081117– Published 18 August, 2022
  • Received 28 May 2021
  • Revised 24 July 2022
  • Accepted 3 August 2022
Crossmark - Check for updates button

©2022 American Physical Society

Sign In to Your Journals Account

Filter

Filter

Article Lookup

Enter a citation