Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Q59: Theoretical Methods for Topological Insulators
3:00 PM–6:00 PM,
Wednesday, March 16, 2022
Room: Hyatt Regency Hotel -DuSable AB
Sponsoring
Unit:
DCMP
Chair: Frank Schindler, Princeton University
Abstract: Q59.00010 : Statistical learning of engineered topological phases in the kagome superlattice of AV3Sb5
4:48 PM–5:00 PM
Presenter:
Paul Wunderlich
(Goethe University Frankfurt)
Authors:
Paul Wunderlich
(Goethe University Frankfurt)
Thomas Mertz
(Goethe University Frankfurt)
Shinibali Bhattacharyya
(Goethe University Frankfurt)
Francesco Ferrari
(Goethe University Frankfurt)
Roser Valenti
(Goethe University Frankfurt)
Motivated by a plethora of experimental evidence for unconventional charge orders in the enlarged (2×2) unit-cell of the vanadium based kagome metals, we investigate the type of topological phases that can manifest within the electronic parameter space of such kagome superlattices.
Unlike conventional theoretical approaches, we employ a recently introduced statistical method capable of constructing topological models for any generic lattice, in an unbiased way without prior knowledge of its phase diagram.
By extracting physically meaningful information from large datasets of randomized hopping parameters for the kagome superlattice, we find possible real-space manifestations of charge and bond modulations and associated flux patterns for different topological classes.
Our results agree with contemporary theoretical propositions and experimental observations for the AV3Sb5 family.
Simultaneously, we predict new higher-order topological phases that may be realized by appropriately manipulating the currently known systems.
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