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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University of Melbourne Researchers

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).