Photocurrent-driven transient symmetry breaking in the Weyl semimetal TaAs

N. Sirica, P. P. Orth, M. S. Scheurer, Y. M. Dai, M. C. Lee, P. Padmanabhan, L. T. Mix, S. W. Teitelbaum, M. Trigo, L. X. Zhao, G. F. Chen, B. Xu, R. Yang, B. Shen, C. Hu, C. C. Lee, H. Lin, T. A. Cochran, S. A. Trugman, J. X. ZhuM. Z. Hasan, N. Ni, X. G. Qiu, A. J. Taylor, D. A. Yarotski, R. P. Prasankumar

Research output: Contribution to journalArticlepeer-review

Abstract

Symmetry plays a central role in conventional and topological phases of matter, making the ability to optically drive symmetry changes a critical step in developing future technologies that rely on such control. Topological materials, like topological semimetals, are particularly sensitive to a breaking or restoring of time-reversal and crystalline symmetries, which affect both bulk and surface electronic states. While previous studies have focused on controlling symmetry via coupling to the crystal lattice, we demonstrate here an all-electronic mechanism based on photocurrent generation. Using second harmonic generation spectroscopy as a sensitive probe of symmetry changes, we observe an ultrafast breaking of time-reversal and spatial symmetries following femtosecond optical excitation in the prototypical type-I Weyl semimetal TaAs. Our results show that optically driven photocurrents can be tailored to explicitly break electronic symmetry in a generic fashion, opening up the possibility of driving phase transitions between symmetry-protected states on ultrafast timescales.

Original languageEnglish (US)
Pages (from-to)62-66
Number of pages5
JournalNature materials
Volume21
Issue number1
DOIs
StatePublished - Jan 2022
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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