posted on 2024-01-26, 18:09authored byJingyuan Zhong, Ming Yang, Jianfeng Wang, Yaqi Li, Chen Liu, Dan Mu, Yundan Liu, Ningyan Cheng, Zhixiang Shi, Lexian Yang, Jincheng Zhuang, Yi Du, Weichang Hao
The
confinement of electrons in one-dimensional (1D) space highlights
the prominence of the role of electron interactions or correlations,
leading to a variety of fascinating physical phenomena. The quasi-1D
electron states can exhibit a unique spin texture under spin–orbit
interaction (SOI) and thus could generate a robust spin current by
forbidden electron backscattering. Direct detection of such 1D spin
or SOI information, however, is challenging due to complicated techniques.
Here, we identify an anomalous planar Hall effect (APHE) in the magnetotransport
of quasi-1D van der Waals (vdW) topological materials as exemplified
by Bi4Br4, which arises from the quantum interference
correction of 1D weak antilocalization (WAL) to the ordinary planar
Hall effect and demonstrates a deviation from the usual sine and cosine
curves. The occurrence of 1D WAL is correlated to the line-shape Fermi
surface and persistent spin texture of (100) topological surface states
of Bi4Br4, as revealed by both our angle-resolved
photoemission spectroscopy and first-principles calculations. By generalizing
the observation of APHE to other non-vdW bulk materials, this work
provides a possible characteristic of magnetotransport for identifying
the spin/SOI information and quantum interference behavior of 1D states
in 3D topological material.