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  • Letter

Ultrafast nonequilibrium dynamics and high-harmonic generation in two-dimensional quantum spin Hall materials

Rajesh K. Malla1,2,3, Dasol Kim4,5, Dong Eon Kim4,5, Alexis Chacón4,5, and Wilton J. M. Kort-Kamp1,*

  • 1Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 2Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 3Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 4Department of Physics and Center for Attosecond Science and Technology, POSTECH, 7 Pohang 37673, South Korea
  • 5Max Planck POSTECH/KOREA Research Initiative, Pohang 37673, South Korea

  • *kortkamp@lanl.gov
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Phys. Rev. Materials 7, L051201 – Published 15 May, 2023

DOI: https://doi.org/10.1103/PhysRevMaterials.7.L051201

Abstract

We develop the theoretical framework of nonequilibrium ultrafast photonics in monolayer quantum spin Hall insulators supporting a multitude of topological states. In these materials, ubiquitous strong light-matter interactions in the femtosecond scale lead to nonadiabatic quantum dynamics, resulting in topology-dependent nonlinear optoelectronic transport phenomena. We investigate the mechanism driving topological Dirac fermions interacting with strong ultrashort light pulses and uncover various experimentally accessible physical quantities that encode fingerprints of the quantum material's topological electronic state from the high-harmonic generated spectrum. Our work sets the theoretical cornerstones to realize the full potential of time-resolved harmonic spectroscopy for understanding nonequilibrium processes in quantum topological systems and identifying topological invariants in two-dimensional quantum spin Hall solid state systems.

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Phys. Rev. Materials 7, L051201– Published 15 May, 2023
  • Received 26 July 2022
  • Revised 11 January 2023
  • Accepted 26 April 2023
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