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Fractional corner charges in spin-orbit coupled crystals
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- Schindler, Frank (author)
- Univ Zurich, Dept Phys, Winterthurerstr 190, CH-8057 Zurich, Switzerland.;Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA.
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- Brzezinska, Marta (author)
- Univ Zurich, Dept Phys, Winterthurerstr 190, CH-8057 Zurich, Switzerland.;Wroclaw Univ Sci & Technol, Fac Fundamental Problems Technol, Dept Theoret Phys, PL-50370 Wroclaw, Poland.
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- Benalcazar, Wladimir A. (author)
- Penn State Univ, Dept Phys, University Pk, PA 16802 USA.
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- Univ Zurich, Dept Phys, Winterthurerstr 190, CH-8057 Zurich, Switzerland;Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA. Univ Zurich, Dept Phys, Winterthurerstr 190, CH-8057 Zurich, Switzerland.;Wroclaw Univ Sci & Technol, Fac Fundamental Problems Technol, Dept Theoret Phys, PL-50370 Wroclaw, Poland. (creator_code:org_t)
- AMER PHYSICAL SOC, 2019
- 2019
- English.
- In: Physical Review Research. - : AMER PHYSICAL SOC. - 2643-1564. ; 1:3
- Journal article (peer-reviewed)
Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- Uppsala University
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