Design and realization of topological Dirac fermions on a triangular lattice

• URL: http://arxiv.org/abs/2106.16025v1
• Date: Wed, 30 Jun 2021 12:46:28 GMT
• Title: Design and realization of topological Dirac fermions on a triangular lattice
• Authors: Maximilian Bauernfeind, Jonas Erhardt, Philipp Eck, Pardeep K. Thakur, Judith Gabel, Tien-Lin Lee, J\"org Sch\"afer, Simon Moser, Domenico Di Sante, Ralph Claessen, Giorgio Sangiovanni
• Abstract summary: Large-gap quantum spin Hall insulators are promising materials for room-temperature applications based on Dirac fermions. Key to engineer the topologically non-trivial band ordering and sizable band gaps is strong spin-orbit interaction. Here, we conceive and realize "indenene", a triangular monolayer of indium on SiC exhibiting non-trivial valley physics driven by local spin-orbit coupling.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Large-gap quantum spin Hall insulators are promising materials for room-temperature applications based on Dirac fermions. Key to engineer the topologically non-trivial band ordering and sizable band gaps is strong spin-orbit interaction. Following Kane and Mele's original suggestion, one approach is to synthesize monolayers of heavy atoms with honeycomb coordination accommodated on templates with hexagonal symmetry. Yet, in the majority of cases, this recipe leads to triangular lattices, typically hosting metals or trivial insulators. Here, we conceive and realize "indenene", a triangular monolayer of indium on SiC exhibiting non-trivial valley physics driven by local spin-orbit coupling, which prevails over inversion-symmetry breaking terms. By means of tunneling microscopy of the 2D bulk we identify the quantum spin Hall phase of this triangular lattice and unveil how a hidden honeycomb connectivity emerges from interference patterns in Bloch $p_x \pm ip_y$-derived wave functions.

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