Pd*

In topological materials, there are topological surface states with chirality.  Certain topological materials are also topological triplet superconductors, such as β-Bi₂Pd [1,2], which host spin-polarized surface states as reported by angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy studies [3,4].  In this work, we investigate the transverse voltage to the applied magnetic field within the vortex phase to the upper critical field H_C2 [5]. The transverse drop is not odd-symmetric but even-symmetric to the applied magnetic field.  The sign of the transverse voltage is dictated not by the polarity of the magnetic field, but by the broken inversion symmetry at the interfaces. This key feature indicates the intrinsic chirality in the topological surface states in β-Bi₂Pd as revealed by transport measurements.

[1] Y Li, X Xu, M.-H Lee, M.-W Chu, C. L. Chien, Science 366, 238 (2019).

[2] X Xu, Y Li, C. L. Chien, arXiv:2210.08733 (2022).

[2] Y.-F Lv et al., Sci. Bull. 62, 852 (2017).

[3] K. Iwaya et al., Nat. Commun. 8, 976 (2017).

[4] X. Xu, Y. Li, C. L. Chien, Nat. Commun. 13, 5321 (2022).