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Manipulation of quantum geometrical properties in Weyl semimetal

ORAL

Abstract

Quantum materials with novel phases of matter are the key building blocks of energy efficient quantum electronics and powerful quantum computation. Exploiting control of those materials is fascinating to achieve new functionalities and information algorithm in future quantum devices. Quantum nanomaterials like layered materials, has revealed many exotic properties such as extremely large magnetoresistance (MR)1, type-II Weyl electron transport and diverging Berry curvature2. On the other hand, the nature of layered materials leads to ultra large tunability of physical properties via external stimuli.
Here we report the manipulation of quantum geometrical properties in layered Weyl semimetal devices. With such control and various characterization means, we observed substantial modulation in optical and electrical responses from the device. The observations indicate such changes are closely associated with the variation of topological and geometrical property. Our findings highlight the potential for the realization of topological quantum devices based on layered quantum materials.

1. Ali, M. N. et al. Large, non-saturating magnetoresistance in WTe2. Nature 514, 205–8 (2014).
2. Armitage, N. P. et al. A. Weyl and Dirac semimetals in three-dimensional solids. Rev. Mod. Phys. (2018).

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Presenters

  • Jun Xiao

    Stanford Univ, University of California, Berkeley

Authors

  • Jun Xiao

    Stanford Univ, University of California, Berkeley

  • Ying Wang

    University of California Berkeley

  • Hua Wang

    Texas A&M University, Texas A&M Univ

  • Sri Chaitanya Das Pemmaraju

    SLAC, SLAC - Natl Accelerator Lab

  • Siqi Wang

    University of California at Berkeley, University of California Berkeley

  • Philipp Karl Muscher

    Stanford Univ

  • Edbert Jarvis Sie

    Stanford Univ, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory

  • Clara M Nyby

    Stanford Univ

  • Thomas Devereaux

    Stanford Univ, Materials Science and Engineering, Stanford University, Stanford University, SLAC National Accelerator Laboratory, Photon Sciences, Stanford Linear Accelerator (SLAC), SIMES, SLAC, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA, SLAC National Accelerator Lab.

  • Xiaofeng Qian

    Texas A&M University, Texas A&M Univ

  • Xiang Zhang

    University of California at Berkeley, University of California Berkeley, University of California, Berkeley

  • Aaron Lindenberg

    Stanford Univ, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, SLAC National Accelerator Laboratory