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Partial chiral symmetry-breaking as a route to spectrally isolated topological defect states in two-dimensional artificial materials

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Partial chiral symmetry-breaking as a route to spectrally isolated topological defect states in two-dimensional artificial materials. / Poli, Charles Joseph; Schomerus, Henning Ulrich; Bellec, Matthieu; Kuhl, Ulrich; Mortessagne, Fabrice.

In: 2D Materials, Vol. 4, No. 2, 025008, 06.2017.

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@article{75986d5598494db0b3b5d4689b95ceff,
title = "Partial chiral symmetry-breaking as a route to spectrally isolated topological defect states in two-dimensional artificial materials",
abstract = "Bipartite quantum systems from the chiral universality classes admit topologically protected zero modes at point defects. However, in two-dimensional systems these states can be difficult to separate from compacton-like localized states that arise from flat bands, formed if the two sublattices support a different number of sites within a unit cell. Here we identify a natural reduction of chiral symmetry, obtained by coupling sites on the majority sublattice, which gives rise to spectrally isolated point-defect states, topologically characterized as zero modes supported by the complementary minority sublattice. We observe these states in a microwave realization of a dimerized Lieb lattice with next-nearest neighbour coupling, and also demonstrate topological mode selection via sublattice-staggered absorption.",
keywords = "defect states, topological materials, symmetries, mode selection, flat bands, Lieb lattice, Dirac points",
author = "Poli, {Charles Joseph} and Schomerus, {Henning Ulrich} and Matthieu Bellec and Ulrich Kuhl and Fabrice Mortessagne",
year = "2017",
month = jun,
language = "English",
volume = "4",
journal = "2D Materials",
issn = "2053-1583",
publisher = "IOP Publishing Ltd.",
number = "2",

}

RIS

TY - JOUR

T1 - Partial chiral symmetry-breaking as a route to spectrally isolated topological defect states in two-dimensional artificial materials

AU - Poli, Charles Joseph

AU - Schomerus, Henning Ulrich

AU - Bellec, Matthieu

AU - Kuhl, Ulrich

AU - Mortessagne, Fabrice

PY - 2017/6

Y1 - 2017/6

N2 - Bipartite quantum systems from the chiral universality classes admit topologically protected zero modes at point defects. However, in two-dimensional systems these states can be difficult to separate from compacton-like localized states that arise from flat bands, formed if the two sublattices support a different number of sites within a unit cell. Here we identify a natural reduction of chiral symmetry, obtained by coupling sites on the majority sublattice, which gives rise to spectrally isolated point-defect states, topologically characterized as zero modes supported by the complementary minority sublattice. We observe these states in a microwave realization of a dimerized Lieb lattice with next-nearest neighbour coupling, and also demonstrate topological mode selection via sublattice-staggered absorption.

AB - Bipartite quantum systems from the chiral universality classes admit topologically protected zero modes at point defects. However, in two-dimensional systems these states can be difficult to separate from compacton-like localized states that arise from flat bands, formed if the two sublattices support a different number of sites within a unit cell. Here we identify a natural reduction of chiral symmetry, obtained by coupling sites on the majority sublattice, which gives rise to spectrally isolated point-defect states, topologically characterized as zero modes supported by the complementary minority sublattice. We observe these states in a microwave realization of a dimerized Lieb lattice with next-nearest neighbour coupling, and also demonstrate topological mode selection via sublattice-staggered absorption.

KW - defect states

KW - topological materials

KW - symmetries

KW - mode selection

KW - flat bands

KW - Lieb lattice

KW - Dirac points

M3 - Journal article

VL - 4

JO - 2D Materials

JF - 2D Materials

SN - 2053-1583

IS - 2

M1 - 025008

ER -