%0 Journal Article
%A Sheverdyaeva, Polina M.
%A Hogan, Conor
%A Bihlmayer, Gustav
%A Fujii, Jun
%A Vobornik, Ivana
%A Jugovac, Matteo
%A Kundu, Asish K.
%A Gardonio, Sandra
%A Benher, Zipporah Rini
%A Santo, Giovanni Di
%A Gonzalez, Sara
%A Petaccia, Luca
%A Carbone, Carlo
%A Moras, Paolo
%T Giant and Tunable Out-of-Plane Spin Polarization of Topological Antimonene
%J Nano letters
%V 23
%N 14
%@ 1530-6984
%C Washington, DC
%I ACS Publ.
%M FZJ-2023-02920
%P 6277 - 6283
%D 2023
%X Topological insulators are bulk insulators with metallic and fully spin-polarized surface states displaying Dirac-like band dispersion. Due to spin-momentum locking, these topological surface states (TSSs) have a predominant in-plane spin polarization in the bulk fundamental gap. Here, we show by spin-resolved photoemission spectroscopy that the TSS of a topological insulator interfaced with an antimonene bilayer exhibits nearly full out-of-plane spin polarization within the substrate gap. We connect this phenomenon to a symmetry-protected band crossing of the spin-polarized surface states. The nearly full out-of-plane spin polarization of the TSS occurs along a continuous path in the energy–momentum space, and the spin polarization within the gap can be reversibly tuned from nearly full out-of-plane to nearly full in-plane by electron doping. These findings pave the way to advanced spintronics applications that exploit the giant out-of-plane spin polarization of TSSs.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 37459226
%U <Go to ISI:>//WOS:001030480300001
%R 10.1021/acs.nanolett.3c00153
%U https://juser.fz-juelich.de/record/1009615