Large in-plane Hall/Nernst effect generated by Berry curvature in Weyl semimetallic phase of indium doped Pb_1-xSn_xTe

The Hall/Nernst effects have led to interesting phenomena in modern physics such as Berry curvature. The conventional Hall/Nernst signals appear only when the magnetic field is applied perpendicular to the sample because the conventional Lorentz force vanishes when the magnetic field is applied in the plane.

Interestingly, in the Weyl semimetallic phase of indium doped Pn_1-xSn_xTe, large in-plane Hall/Nernst signals are observed. This suggests the existence of large Berry curvature coming from the Weyl nodes. When no magnetic field is applied, the time reversal symmetry requires the Weyl nodes to distribute such that Hall/Nernst signals vanish completely. As the magnetic field is turned on, the Weyl nodes move in the momentum space and generate the finite value of Hall/Nernst signals, even when the magnetic field is applied in the plane. The implication of the experimental data will be discussed.