Type II Weyl Semimetals

Type II Weyl Semimetals

December 1, 2015 | Alexey A. Soluyanov1, Dominik Gresch1, Zhijun Wang2, QuanSheng Wu1, Matthias Troyer1, Xi Dai2, and B. Andrei Bernevig3
The paper introduces a new type of Weyl fermion, a particle with unique properties, that emerges at the boundary between electron and hole pockets in a novel Weyl semimetal phase. This particle, which was missed by Weyl due to its breaking of Lorentz symmetry, is predicted to exist in the material WTe$_2$. The authors provide evidence that WTe$_2$ hosts eight Type-II Weyl points, characterized by an open Fermi surface and distinct thermodynamic properties compared to traditional point-like Weyl points. They demonstrate that the material exhibits a topological phase with a finite density of states at the Weyl nodes, leading to unique physical phenomena such as open Fermi arcs on the surface and different magnetotransport anomalies. The study also explores the effects of hydrostatic pressure on the Weyl points, showing that compressive strain can drive a transition from Type-II to Type-I Weyl points. The findings highlight the importance of considering the anisotropic properties of Weyl semimetals and their potential for novel electronic and magnetic behaviors.The paper introduces a new type of Weyl fermion, a particle with unique properties, that emerges at the boundary between electron and hole pockets in a novel Weyl semimetal phase. This particle, which was missed by Weyl due to its breaking of Lorentz symmetry, is predicted to exist in the material WTe$_2$. The authors provide evidence that WTe$_2$ hosts eight Type-II Weyl points, characterized by an open Fermi surface and distinct thermodynamic properties compared to traditional point-like Weyl points. They demonstrate that the material exhibits a topological phase with a finite density of states at the Weyl nodes, leading to unique physical phenomena such as open Fermi arcs on the surface and different magnetotransport anomalies. The study also explores the effects of hydrostatic pressure on the Weyl points, showing that compressive strain can drive a transition from Type-II to Type-I Weyl points. The findings highlight the importance of considering the anisotropic properties of Weyl semimetals and their potential for novel electronic and magnetic behaviors.
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