Manipulating Weyl quasiparticles by orbital-selective photoexcitation in WTe2

Meng-Xue Guan, En Wang, Pei-Wei You, Jia-Tao Sun () and Sheng Meng ()
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Meng-Xue Guan: Chinese Academy of Sciences
En Wang: Chinese Academy of Sciences
Pei-Wei You: Chinese Academy of Sciences
Jia-Tao Sun: Chinese Academy of Sciences
Sheng Meng: Chinese Academy of Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Optical control of structural and electronic properties of Weyl semimetals allows development of switchable and dissipationless topological devices at the ultrafast scale. An unexpected orbital-selective photoexcitation in type-II Weyl material WTe2 is reported under linearly polarized light (LPL), inducing striking transitions among several topologically-distinct phases mediated by effective electron-phonon couplings. The symmetry features of atomic orbitals comprising the Weyl bands result in asymmetric electronic transitions near the Weyl points, and in turn a switchable interlayer shear motion with respect to linear light polarization, when a near-infrared laser pulse is applied. Consequently, not only annihilation of Weyl quasiparticle pairs, but also increasing separation of Weyl points can be achieved, complementing existing experimental observations. In this work, we provide a new perspective on manipulating the Weyl node singularity and coherent control of electron and lattice quantum dynamics simultaneously.

Date: 2021
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DOI: 10.1038/s41467-021-22056-9

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