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.
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Relevant material, data and associated protocols, including code and scripts, are curated and archived at the Materials Data Facility (https://doi.org/10.18126/lram-eh2d) and made available to the public.
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Acknowledgements
This work was performed at the Center for Integrated Nanotechnologies at Los Alamos National Laboratory, a US Department of Energy, Office of Basic Energy Sciences user facility, under user proposal nos 2017BC0064 and 2019AU0167. Use of the Linac Coherent Light Source, SLAC National Accelerator Laboratory, is supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under contract no. DE-AC02-76SF00515. N.S. and R.P.P. gratefully acknowledge the support of the US Department of Energy through the Los Alamos National Laboratory LDRD programme. P.P.O., J.-X.Z. and D.A.Y. are supported by the Center for Advancement of Topological Semimetals, an Energy Frontier Research Center funded by the US Department of Energy Office of Science, Office of Basic Energy Sciences, through the Ames Laboratory under contract no. DE-AC02-07CH11358. T.A.C. and M.Z.H. acknowledge support from the US Department of Energy under grant DE-FG-02-05ER46200. Work at University of California, Los Angeles was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under award no. DE-SC0021117 for single-crystal growth and characterization. C.H. thanks the support of the Julian Schwinger Fellowship at University of California, Los Angeles. M.S.S. acknowledges support from the National Science Foundation under grant no. DMR-1664842. C.-C.L. acknowledges the Ministry of Science and Technology of Taiwan for financial support under contract no. MOST 108-2112-M-032-010-MY2. T.A.C. was supported by the National Science Foundation Graduate Research Fellowship Program under grant no. DGE-1656466. M.T. and S.W.T. were supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences through the Division of Materials Sciences and Engineering under contract no. DE-AC02-76SF00515. We thank Y.-M. Sheu for the helpful discussion.
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TaAs single crystals were grown and characterized by L.X.Z., G.F.C., B.X., R.Y., B.S., C.H., N.N. and X.G.Q., with additional sample characterization and physical insights provided by T.A.C. and M.Z.H.; N.S. and Y.M.D. performed the TR-SHG experiments with help from M.-C.L., P.P. and L.T.M.; N.S., S.W.T., M.T. and R.P.P. performed the time-resolved X-ray diffraction experiments with help from Linac Coherent Light Source staff. The data were analysed by N.S., P.P.O. and M.S.S. with a detailed symmetry analysis performed by P.P.O. and M.S.S. Ab initio calculations were carried out by C.-C.L. and H.L. with additional insight provided by J.-X.Z. The manuscript was written by N.S., P.P.O., M.S.S. and R.P.P. with added contributions from S.A.T., A.J.T. and D.A.Y.
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Sirica, N., Orth, P.P., Scheurer, M.S. et al. Photocurrent-driven transient symmetry breaking in the Weyl semimetal TaAs. Nat. Mater. 21, 62–66 (2022). https://doi.org/10.1038/s41563-021-01126-9
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DOI: https://doi.org/10.1038/s41563-021-01126-9
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