Journal article
Impurity bound states as detectors of topological band structures revisited
Seydou-Samba Diop, Lars Fritz, Matthias Vojta, Stephan Rachel
Physical Review B | AMER PHYSICAL SOC | Published : 2020
Abstract
Band structures of topological insulators are characterized by nonlocal topological invariants. Consequently, proposals for the experimental detection using local probes are rare. A recent paper [R.-J. Slager et al., Phys. Rev. B 92, 085126 (2015)] has argued, based on theoretical results for a particular class of models, that insulators with topologically trivial and nontrivial band structures in two space dimensions display a qualitatively different response to pointlike impurities. Here, we present a comprehensive investigation of the impurity response of a large set of models of noninteracting electrons on the honeycomb lattice, driven insulating by either broken inversion, broken time-r..
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Grants
Awarded by National Science Foundation
Awarded by Australian Research Council
Awarded by Deutsche Forschungsgemeinschaft (DFG)
Awarded by Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter-ct.qmat
Funding Acknowledgements
We acknowledge discussions with D. P. Arovas, R.-J. Slager, and M. Maksymenko and earlier collaborations with D. P. Arovas and I. Goethel. This research was supported in part by the National Science Foundation under Grant No. NSF PHY-1748958. S.R. acknowledges hospitality from KITP St. Barbara and support from the Australian Research Council through Grants No. FT180100211 and No. DP200101118. M.V. acknowledges support from the Deutsche Forschungsgemeinschaft (DFG) through SFB 1143 (Project ID No. 247310070) and the Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter-ct.qmat (EXC 2147, Project ID No. 39085490).