@article{Schindler:2019:10.1103/physrevresearch.1.033074,
author = {Schindler, F and Brzeziska, M and Benalcazar, WA and Iraola, M and Bouhon, A and Tsirkin, SS and Vergniory, MG and Neupert, T},
doi = {10.1103/physrevresearch.1.033074},
journal = {Physical Review Research},
pages = {1--20},
title = {Fractional corner charges in spin-orbit coupled crystals},
url = {http://dx.doi.org/10.1103/physrevresearch.1.033074},
volume = {1},
year = {2019}
}

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TY  - JOUR
AB  - We study two-dimensional spinful insulating phases of matter that are protected by time-reversal and crystalline symmetries. To characterize these phases, we employ the concept of corner charge fractionalization: corners can carry charges that are fractions of even multiples of the electric charge. The charges are quantized and topologically stable as long as all symmetries are preserved. We classify the different corner charge configurations for all point groups, and match them with the corresponding bulk topology. For this we employ symmetry indicators and (nested) Wilson loop invariants. We provide formulas that allow for a convenient calculation of the corner charge from Bloch wave functions and illustrate our results using the example of arsenic and antimony monolayers. Depending on the degree of structural buckling, these materials can exhibit two distinct obstructed atomic limits. We present density functional theory calculations for open flakes to support our findings.
AU  - Schindler,F
AU  - Brzeziska,M
AU  - Benalcazar,WA
AU  - Iraola,M
AU  - Bouhon,A
AU  - Tsirkin,SS
AU  - Vergniory,MG
AU  - Neupert,T
DO  - 10.1103/physrevresearch.1.033074
EP  - 20
PY  - 2019///
SN  - 2643-1564
SP  - 1
TI  - Fractional corner charges in spin-orbit coupled crystals
T2  - Physical Review Research
UR  - http://dx.doi.org/10.1103/physrevresearch.1.033074
UR  - http://hdl.handle.net/10044/1/105874
VL  - 1
ER  - 

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