High-pressure induced Weyl semimetal phase in 2D Tellurium

Chang Niu, Zhuocheng Zhang, David Graf, Seungjun Lee, Mingyi Wang, Wenzhuo Wu, Tony Low, Peide D. Ye

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Relativistic Weyl fermion quasiparticles in Weyl semimetal bring the electron’s chirality degree of freedom into the electrical transport and give rise to exotic phenomena. A topological phase transition from a topological trivial phase to a topological non-trivial phase offers a route to control electronic devices through its topological properties. Here, we report the Weyl semimetal phase in hydrothermally grown two-dimensional Tellurium (2D Te) induced by high hydrostatic pressure (up to 2.47 GPa). The unique chiral crystal structure gives rise to chiral fermions with different topological chiral charges (C= − 1 , + 1 , and− 2). The highly tunable chemical potential in 2D Te provides comprehensive information for understanding the pressure-dependent electron band structure. The pressure-induced insulator-to-metal transition, two-carrier transport, and the non-trivial π Berry phase shift in quantum oscillations are observed in the 2D Te Weyl semimetal phase. Our work demonstrates the pressure-induced bandgap closing in the inversion asymmetric narrow bandgap semiconductor 2D Te.

Original languageEnglish (US)
Article number345
JournalCommunications Physics
Issue number1
StatePublished - Dec 2023
Externally publishedYes

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