Revealing the Hidden Spin-Polarized Bands in a Superconducting Tl Bilayer Crystal
Journal article, 2023
The interplay of spin-orbit coupling and crystal symmetry can generate spin-polarized bands in materials only a few atomic layers thick, potentially leading to unprecedented physical properties. In the case of bilayer materials with global inversion symmetry, locally broken inversion symmetry can generate degenerate spin-polarized bands, in which the spins in each layer are oppositely polarized. Here, we demonstrate that the hidden spins in a Tl bilayer crystal are revealed by growing it on Ag(111) of sizable lattice mismatch, together with the appearance of a remarkable phenomenon unique to centrosymmetric hidden-spin bilayer crystals: a novel band splitting in both spin and space. The key to success in observing this novel splitting is that the interaction at the interface has just the right strength: it does not destroy the original wave functions of the Tl bilayer but is strong enough to induce an energy separation.
spintronics
superconductor
hidden spin
bilayer material
photoelectron spectroscopy
Author
Takahiro Kobayashi
Osaka University
Yuichiro Toichi
Osaka University
Koichiro Yaji
National Institute for Materials Science (NIMS)
Yoshitaka Nakata
Chiba University
Yuchi Yaoita
Chiba University
Mutsuki Iwaoka
Chiba University
Mariko Koga
Chiba University
Yituo Zhang
Chiba University
J. Fujii
Laboratorio Nazionale TASC
Shimpei Ono
Central Research Institute of Electric Power Industry (CRIEPI)
Yasmine Sassa
Chalmers, Physics, Materials Physics
Yasuo Yoshida
University of Tokyo
Yukio Hasegawa
University of Tokyo
Fumio Komori
University of Tokyo
Shik Shin
University of Tokyo
Satoru Ichinokura
University of Tokyo
Ryota Akiyama
University of Tokyo
Shuji Hasegawa
University of Tokyo
Tatsuya Shishidou
University of Wisconsin Milwaukee
Michael Weinert
University of Wisconsin Milwaukee
Kazuyuki Sakamoto
Center for Spintronics Research Network
Osaka University
Nano Letters
1530-6984 (ISSN) 1530-6992 (eISSN)
Vol. 23 16 7675-7682Realization of Novel Low‐Dimensional Skyrmion Systems
Swedish Research Council (VR) (2017-05078), 2019-06-01 -- 2021-12-31.
Subject Categories
Condensed Matter Physics
DOI
10.1021/acs.nanolett.3c02387
PubMed
37578323