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DS: Fachverband Dünne Schichten

DS 20: Poster

DS 20.43: Poster

Donnerstag, 12. März 2026, 18:30–20:30, P2

High-Fermi velocity massless carriers in a triangular monolayer of Sb — Bing Liu^1,2, •Kilian Strauß^1,2, Philipp Eck^2,3, Jonas Erhardt^1,2, Tim Wagner^1,2, Philipp Keßler^1,2, Cedric Schmitt^1,2, Lukas Gehrig^1,2, Stefan Enzner^2,3, Martin Kamp^1,2, Jörg Schäfer^1,2, Giorgio Sangiovanni^2,3, Simon Moser^1,2, and Ralph Claessen^1,2 — ¹Physikalisches Institut, Universität Würzburg, D-97074 Würzburg, Germany — ²Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, D-97074 Würzburg, Germany — ³Institut für Theoretische Physik und Astrophysik, Universität Würzburg, D-97074 Würzburg, Germany

Two-dimensional (2D) quantum materials with high Fermi velocities are key candidates for ballistic transport and high-speed electronics. However, few 2D systems have the potential to demonstrate Fermi velocities exceeding that of graphene, remaining at the level of prediction. Here, we report the successful synthesis of a triangular monolayer of antimony (Sb) on the wide-gap semiconductor SiC. Using combined angle resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy (STM) in combination with density functional theory (DFT), we reveal orbital filtering that isolates broad-bandwidth, massless p_x and p_y states, yielding a compensated Fermi surface with an ultrahigh Fermi velocity surpassing that of pristine graphene. Linear dichroism in ARPES measurements confirm the orbital polarization of these high-velocity bands. This makes the triangular antimonene a compelling platform for next-generation quantum and high-speed electronic technologies.

Keywords: Antimonene; Triangular lattice; 2D Materials; High Fermi velocity