Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 55: Topology and Symmetry Protected Materials (joint session O/TT)
TT 55.9: Vortrag
Mittwoch, 20. März 2024, 17:00–17:15, HL 001
Giant tunable out-of-plane spin polarization in topological antimonene — •Polina Sheverdyaeva1, Conor Hogan2,3, Gustav Bihlmayer4, Jun Fujii5, Ivana Vobornik5, Matteo Jugovac1,6, Asish K. Kundu1,7, Sandra Gardonio8, Zipporah Rini Benher8, Giovanni Di Santo9, Sara Gonzalez9, Luca Petaccia9, Carlo Carbone1, and Paolo Moras1 — 1ISM-CNR, Trieste, Italy — 2ISM-CNR, Roma, Italy — 3Dipartimento di Fisica, Università di Roma "Tor Vergata", Roma, Italy — 4PGI and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, Jülich, Germany — 5IOM-CNR, Trieste, Italy — 6PGI, Forschungszentrum Jülich, Jülich, Germany — 7ICTP, Trieste, Italy — 8University of Nova Gorica, Ajdovščina, Slovenia — 9Elettra - Sincrotrone Trieste S.C.p.A.,Trieste, Italy
We show first-principles calculations and angle- and spin- resolved photoemission studies of a heterointerface built of a single bilayer of β-antimonene and a bulk bismuth selenide. The trivial insulator β-antimonene inherits the topological surface state of the substrate as a result of a topological proximity effect. The new topological state exhibits an unusually high, almost complete out-of-plane spin polarization within the substrate gap, that we explain by a symmetry-protected band crossing of spin-polarized surface states. The spin polarization can be finely and reversibly tuned from nearly full out-of-plane to nearly full in-plane by electron doping. Our findings pave the way towards advanced spintronics applications exploiting the giant out-of-plane spin polarization of topological surface states.
Keywords: antimonene; ARPES; spin; topological surface states