Realization of Weyl semimetal phase in a non-centrosymmetric superlattice in Kane-Mele model

Jiseon Shin; Gun Sang Jeon

doi:10.1088/1361-648X/ab0ceb

Realization of Weyl semimetal phase in a non-centrosymmetric superlattice in Kane-Mele model

Jiseon Shin, Gun Sang Jeon

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We investigate a superlattice alternately composed of quantum spin Hall insulators in Kane - Mele model and two-dimensional normal insulators due to the staggered lattice potential. The staggered lattice potential in normal insulators as a spacer layer has a role of breaking an inversion symmetry in current study. We show a realization of Weyl semimetal (WSM) phase in a finite region and a phase transition to a weak topological insulator. We estimate Z₂ topological invariants by means of Wannier charge center method which is practical for non-centrosymmetric topological insulators. We also discuss Fermi arcs and chiral charges of WSM phase in surface Brillouin zone.

Original language	English
Article number	255502
Journal	Journal of Physics Condensed Matter
Volume	31
Issue number	25
DOIs	https://doi.org/10.1088/1361-648X/ab0ceb
State	Published - 2019

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea through Grant No. 2013R1A1A2007959 and Grant No. 2018R1D1A1B07048749.

Publisher Copyright:
© 2019 IOP Publishing Ltd Printed in the UK.

Keywords

Superlattice
Wannier charge center
Weyl semimetal
Z topological insulator

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10.1088/1361-648X/ab0ceb

Cite this

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title = "Realization of Weyl semimetal phase in a non-centrosymmetric superlattice in Kane-Mele model",

abstract = "We investigate a superlattice alternately composed of quantum spin Hall insulators in Kane - Mele model and two-dimensional normal insulators due to the staggered lattice potential. The staggered lattice potential in normal insulators as a spacer layer has a role of breaking an inversion symmetry in current study. We show a realization of Weyl semimetal (WSM) phase in a finite region and a phase transition to a weak topological insulator. We estimate Z2 topological invariants by means of Wannier charge center method which is practical for non-centrosymmetric topological insulators. We also discuss Fermi arcs and chiral charges of WSM phase in surface Brillouin zone.",

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AU - Shin, Jiseon

AU - Jeon, Gun Sang

N1 - Funding Information: This work was supported by the National Research Foundation of Korea through Grant No. 2013R1A1A2007959 and Grant No. 2018R1D1A1B07048749. Publisher Copyright: © 2019 IOP Publishing Ltd Printed in the UK.

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N2 - We investigate a superlattice alternately composed of quantum spin Hall insulators in Kane - Mele model and two-dimensional normal insulators due to the staggered lattice potential. The staggered lattice potential in normal insulators as a spacer layer has a role of breaking an inversion symmetry in current study. We show a realization of Weyl semimetal (WSM) phase in a finite region and a phase transition to a weak topological insulator. We estimate Z2 topological invariants by means of Wannier charge center method which is practical for non-centrosymmetric topological insulators. We also discuss Fermi arcs and chiral charges of WSM phase in surface Brillouin zone.

AB - We investigate a superlattice alternately composed of quantum spin Hall insulators in Kane - Mele model and two-dimensional normal insulators due to the staggered lattice potential. The staggered lattice potential in normal insulators as a spacer layer has a role of breaking an inversion symmetry in current study. We show a realization of Weyl semimetal (WSM) phase in a finite region and a phase transition to a weak topological insulator. We estimate Z2 topological invariants by means of Wannier charge center method which is practical for non-centrosymmetric topological insulators. We also discuss Fermi arcs and chiral charges of WSM phase in surface Brillouin zone.

KW - Superlattice

KW - Wannier charge center

KW - Weyl semimetal

KW - Z topological insulator

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JO - Journal of Physics Condensed Matter

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M1 - 255502

ER -

Realization of Weyl semimetal phase in a non-centrosymmetric superlattice in Kane-Mele model

Abstract

Bibliographical note

Keywords

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