SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: Poster Session: Topology
TT 25.17: Poster
Donnerstag, 30. September 2021, 13:30–16:00, P
On the origin of the corner modes of the breathing kagome lattice — •Miguel Angel Jimenez Herrera1,2, María Blanco de Paz2, Aitzol García Etxarri2,3, and Dario Bercioux2,3 — 1Centro de Física de Materiales (CFM-MPC) Centro Mixto CSIC-UPV/EHU, 20018 Donostia-San Sebastián, Basque Country, Spain — 2Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain — 3IKERBASQUE, Basque Foundation for Science, Euskadi Plaza, 5, 48009 Bilbao, Spain
Quantum simulating techniques conform a perfect laboratory to study low-dimensional systems, such as the Su-Schrieffer-Heeger model, in 1D, or the breathing kagome model, in 2D [1]. Here, we address the realization of latter model using the muffin tin method, a first-principles-like technique based on planar wave expansion of the Bloch wave function. We study the standard kagome model and the two breathing phases using topological and symmetry markers. We claim that such breathing phases are both atomic limits: one shows zero bulk polarization, while the other, also called obstructed atomic limit, displays a finite value. We have performed a topological quantum chemistry [2] analysis and we have obtained the same result, supporting our results.
[1] Kempkes et al., Nat. Mater. 18, 1292 (2019)
[2] Bradlyn et al., Nature 547, 298 (2017)