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DOE OSTI · 2587329

Overcoming the challenges of accessing topological hallmarks in Sb(112)

Åsland, A. C. [Norwegian University of Science and Technology, Trondheim (Norway)] (ORCID:0000000328376133)·Bakkelund, J. [Norwegian University of Science and Technology, Trondheim (Norway)]·Cooil, S. P. [University of Oslo (Norway)]·Røst, H. I. [University of Bergen (Norway)] (ORCID:0000000218538349)·Hu, J. [Norwegian University of Science and Technology, Trondheim (Norway)] (ORCID:0000000222328440)·Vescovo, Elio [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)] (ORCID:0000000303503861)·Rajapitamahuni, A. [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)]·Mazzola, F. [Consiglio Nazionale delle Ricerche (CNR), Trieste (Italy). Istituto Officina dei Materiali (IOM); Ca' Foscari University of Venice (Italy)]·Wells, J. W. [Norwegian University of Science and Technology, Trondheim (Norway); University of Oslo (Norway)] (ORCID:000000016366366X)
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Abstract

Sb is topologically non-trivial and semi-metallic, but differs from many topological semi-metals because of its continuous band gap. By measuring its (112) surface using angle- and spin-resolved photoemission spectroscopy, Sb(112) was shown to have 1D spin-polarised surface states resembling those on vicinal Bi surfaces and many topological insulators and topological semi-metals. The shape and spin-polarisation of the measured features and the calculated bands agreed. However, the measured features had a slightly steeper energy dispersion and different Fermi-momenta than the calculated bands. Both theoretical and experimental methods were necessary when determining the topology of Sb(112). The presence of projected bulk states near the Fermi-level and varying surface localisation of the electronic states meant it was challenging to deduce the topology of Sb(112) from the number of bands crossing the Fermi-level or a continuous contour in the bulk band gap. Ultimately, the calculations and measurements suggest that there are topological surface states on the Sb(112) surface.

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36 MATERIALS SCIENCEARPESantimonyspin polarisationtopologyvicinal surfaces

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Åsland, A. C. [Norwegian University of Science and Technology, Trondheim (Norway)] (ORCID:0000000328376133), Bakkelund, J. [Norwegian University of Science and Technology, Trondheim (Norway)], Cooil, S. P. [University of Oslo (Norway)], Røst, H. I. [University of Bergen (Norway)] (ORCID:0000000218538349), Hu, J. [Norwegian University of Science and Technology, Trondheim (Norway)] (ORCID:0000000222328440), Vescovo, Elio [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)] (ORCID:0000000303503861), Rajapitamahuni, A. [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)], Mazzola, F. [Consiglio Nazionale delle Ricerche (CNR), Trieste (Italy). Istituto Officina dei Materiali (IOM); Ca' Foscari University of Venice (Italy)], Wells, J. W. [Norwegian University of Science and Technology, Trondheim (Norway); University of Oslo (Norway)] (ORCID:000000016366366X). 2025-08-19. Overcoming the challenges of accessing topological hallmarks in Sb(112). https://doi.org/10.1088/2516-1075%2Fadf384

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