Higher-order topological superconductivity from repulsive interactions in kagome and honeycomb systems

Research output: Contribution to journal › Journal article › Research › peer-review

Standard

Higher-order topological superconductivity from repulsive interactions in kagome and honeycomb systems. / Li, Tommy; Geier, Max; Ingham, Julian; Scammell, Harley D.

In: 2D Materials, Vol. 9, No. 1, 015031, 01.2022.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Li, T, Geier, M, Ingham, J & Scammell, HD 2022, 'Higher-order topological superconductivity from repulsive interactions in kagome and honeycomb systems', 2D Materials, vol. 9, no. 1, 015031. https://doi.org/10.1088/2053-1583/ac4060

APA

Li, T., Geier, M., Ingham, J., & Scammell, H. D. (2022). Higher-order topological superconductivity from repulsive interactions in kagome and honeycomb systems. 2D Materials, 9(1), [015031]. https://doi.org/10.1088/2053-1583/ac4060

Vancouver

Li T, Geier M, Ingham J, Scammell HD. Higher-order topological superconductivity from repulsive interactions in kagome and honeycomb systems. 2D Materials. 2022 Jan;9(1). 015031. https://doi.org/10.1088/2053-1583/ac4060

Author

Li, Tommy ; Geier, Max ; Ingham, Julian ; Scammell, Harley D. / Higher-order topological superconductivity from repulsive interactions in kagome and honeycomb systems. In: 2D Materials. 2022 ; Vol. 9, No. 1.

Bibtex

@article{d6357b3fd47d420e9a6797269abdc399,
title = "Higher-order topological superconductivity from repulsive interactions in kagome and honeycomb systems",
abstract = "We discuss a pairing mechanism in interacting two-dimensional multipartite lattices that intrinsically leads to a second order topological superconducting state with a spatially modulated gap. When the chemical potential is close to Dirac points, oppositely moving electrons on the Fermi surface undergo an interference phenomenon in which the Berry phase converts a repulsive electron-electron interaction into an effective attraction. The topology of the superconducting phase manifests as gapped edge modes in the quasiparticle spectrum and Majorana Kramers pairs at the corners. We present symmetry arguments which constrain the possible form of the electron-electron interactions in these systems and classify the possible superconducting phases which result. Exact diagonalization of the Bogoliubov-de Gennes Hamiltonian confirms the existence of gapped edge states and Majorana corner states, which strongly depend on the spatial structure of the gap. Possible applications to vanadium-based superconducting kagome metals AV(3)Sb(5) (A = K, Rb, Cs) are discussed.",
keywords = "higher order topology, topological materials, unconventional superconductivity, topological superconductivity, BEHAVIOR, FERMIONS, STATES",
author = "Tommy Li and Max Geier and Julian Ingham and Scammell, {Harley D.}",
year = "2022",
month = jan,
doi = "10.1088/2053-1583/ac4060",
language = "English",
volume = "9",
journal = "2D Materials",
issn = "2053-1583",
publisher = "IOP Publishing",
number = "1",

}

RIS

TY - JOUR

T1 - Higher-order topological superconductivity from repulsive interactions in kagome and honeycomb systems

AU - Li, Tommy

AU - Geier, Max

AU - Ingham, Julian

AU - Scammell, Harley D.

PY - 2022/1

Y1 - 2022/1

N2 - We discuss a pairing mechanism in interacting two-dimensional multipartite lattices that intrinsically leads to a second order topological superconducting state with a spatially modulated gap. When the chemical potential is close to Dirac points, oppositely moving electrons on the Fermi surface undergo an interference phenomenon in which the Berry phase converts a repulsive electron-electron interaction into an effective attraction. The topology of the superconducting phase manifests as gapped edge modes in the quasiparticle spectrum and Majorana Kramers pairs at the corners. We present symmetry arguments which constrain the possible form of the electron-electron interactions in these systems and classify the possible superconducting phases which result. Exact diagonalization of the Bogoliubov-de Gennes Hamiltonian confirms the existence of gapped edge states and Majorana corner states, which strongly depend on the spatial structure of the gap. Possible applications to vanadium-based superconducting kagome metals AV(3)Sb(5) (A = K, Rb, Cs) are discussed.

AB - We discuss a pairing mechanism in interacting two-dimensional multipartite lattices that intrinsically leads to a second order topological superconducting state with a spatially modulated gap. When the chemical potential is close to Dirac points, oppositely moving electrons on the Fermi surface undergo an interference phenomenon in which the Berry phase converts a repulsive electron-electron interaction into an effective attraction. The topology of the superconducting phase manifests as gapped edge modes in the quasiparticle spectrum and Majorana Kramers pairs at the corners. We present symmetry arguments which constrain the possible form of the electron-electron interactions in these systems and classify the possible superconducting phases which result. Exact diagonalization of the Bogoliubov-de Gennes Hamiltonian confirms the existence of gapped edge states and Majorana corner states, which strongly depend on the spatial structure of the gap. Possible applications to vanadium-based superconducting kagome metals AV(3)Sb(5) (A = K, Rb, Cs) are discussed.

KW - higher order topology

KW - topological materials

KW - unconventional superconductivity

KW - topological superconductivity

KW - BEHAVIOR

KW - FERMIONS

KW - STATES

U2 - 10.1088/2053-1583/ac4060

DO - 10.1088/2053-1583/ac4060

M3 - Journal article

VL - 9

JO - 2D Materials

JF - 2D Materials

SN - 2053-1583

IS - 1

M1 - 015031

ER -

ID: 302389222