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Ultrafast investigation and control of Dirac and Weyl semimetals

机译：超快调查和控制Dirac和Weyl Semimetals

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摘要

Ultrafast experiments using sub-picosecond pulses of light are poised to play an important role in the study and use of topological materials and, particularly, of the three-dimensional Dirac and Weyl semimetals. Many of these materials' characteristic properties-their linear band dispersion, Berry curvature, near-vanishing density of states at the Fermi energy, and sensitivity to crystalline and time-reversal symmetries-are closely related to their sub- and few-picosecond response to light. Ultrafast measurements offer the opportunity to explore excitonic instabilities and transient photocurrents, the latter depending on the Berry curvature and possibly quantized by fundamental constants. Optical pulses may, through Floquet effects, controllably and reversibly move, split, merge, or gap the materials' Dirac and Weyl nodes; coherent phonons launched by an ultrafast pulse offer alternate mechanisms for similar control of the nodal structure. This Perspective will briefly summarize the state of research on the ultrafast properties of Dirac and Weyl semimetals, emphasizing important open questions. It will describe the challenges confronting each of these experimental opportunities and suggest what research is needed for ultrafast pulses to achieve their potential of controlling and illuminating the physics of Dirac and Weyl semimetals.
机译：超快实验使用次微皮秒的光脉冲有望在研究和使用拓扑材料中起着重要作用，并且特别是三维Dirac和Weyl半定。这些材料的特征性质 - 它们的线性带分散，浆果曲率，态度的近消失密度，以及对晶体和时间反转对称的敏感性 - 与它们的次级和几乎 - 皮秒响应密切相关光。超快测量提供了探索兴奋性稳定性和瞬态光电流的机会，后者取决于浆果曲率，可能是由基本常数量化的。光学脉冲可以通过浮子效应，可控地和可逆地移动，分裂，合并或间隙材料的DIRAC和Weyl节点;由超快脉冲发射的相干声音提供交替机构，用于类似于节点结构的类似控制。这种观点将简要概括对Dirac和Weyl Semimetals超快性质的研究状态，强调重要的开放问题。它将描述每个实验机会面临的挑战，并表明超快脉冲需要哪些研究，以实现其控制和照射Dirac和Weyl半定态物理学的潜力。

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  • 来源
    《Journal of Applied Physics》 |2021年第7期|070901.1-070901.13|共13页
  • 作者

    Chris P. Weber;

  • 作者单位

    Department of Physics Santa Clara University 500 Ei Camino Real Santa Clara California 95053-0315 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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