Photocurrent-driven transient symmetry breaking in the Weyl semimetal TaAs

doi:10.1038/s41563-021-01126-9

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/121801

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題名:	Photocurrent-driven transient symmetry breaking in the Weyl semimetal TaAs
作者:	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. Zhu;M. Z. Hasan;N. Ni;X. G. Qiu;A. J. Taylor;D. A. Yarotski;R. P. Prasankumar
日期:	2021-11-08
上傳時間:	2021-12-25 12:10:20 (UTC+8)
摘要:	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.
關聯:	Nature Materials 21, p.62-66
DOI:	10.1038/s41563-021-01126-9
顯示於類別:	[物理學系暨研究所] 期刊論文

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