Manipulation of quantum geometrical properties in Weyl semimetal

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).