Poster In-Person
28 Oct 2023
In the presence of spacially anti-symmetric out-of-plane magnetic fields, charged particles follow snake-like trajectories at the field boundary due to the coexistence of opposite-direction gauge potentials along the transport channel [1]. Previous works have shown that such configuration of gauge potentials can also be obtained with anti-symmetric pseudo-magnetic fields [2] or by applying a uniform magnetic field in the presence of a p-n junction [3]. The transport properties of snake states have been widely investigated in consideration of two-dimensional Dirac materials which generally respect crystal symmetry and exhibit isotropic energy dispersion. Here we calculate particle trajectories considering anisotropic Weyl semimetal with broken crystal symmetry and applied electrostatic potential where the barrier interface is parallel to the transport direction as illustrated in Fig. 1 (a). In the proposed model, the applied electrical potential (i.e., V0 = 2 EF, where Ef is the Fermi energy) effectively changes the carrier concentration on the half of the channel as illustrated in Fig. 1 (b) and results in Klein tunneling transport between electron and hole particles of which Fermi surfaces are shown in Fig. 1 (c). As a result, it is shown that the tilted anisotropic band structure of such materials breaks the valley degeneracy of snake state trajectories and thus two valleys with opposite chirality follow different paths with different velocities as shown in Fig. 1 (a).References: [1] L. Oroszlány, P. Rakyta, and A. Kormányos et al. Phys. Rev. B 77, 081403(R), (2008) [2] L. S. Cavalcante, A. Chaves, D. R. da Costa, et al. Physical Review B, 94, 075432 (2016) [3] T. Taychatanapat, Jun You Tan, and Y. Yeo, et al. Nature Communications, 6, 6093 (2015)
