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

Li, T; Geier, M; Ingham, J; D Scammell, H

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

Li, T Geier, M Ingham, J D Scammell, H

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Publisher:: IOP Publishing
Publication Type:: Journal Article
Citation:: 2D Materials, 2022, 9, (1), pp. 015031
Issue Date:: 2022-01-01

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Field	Value	Language
dc.contributor.author	Li, T
dc.contributor.author	Geier, M
dc.contributor.author	Ingham, J
dc.contributor.author	D Scammell, H
dc.date.accessioned	2023-03-10T02:10:52Z
dc.date.available	2023-03-10T02:10:52Z
dc.date.issued	2022-01-01
dc.identifier.citation	2D Materials, 2022, 9, (1), pp. 015031
dc.identifier.issn	2053-1583
dc.identifier.issn	2053-1583
dc.identifier.uri	http://hdl.handle.net/10453/166936
dc.description.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 AV3Sb5 (A = K, Rb, Cs) are discussed.
dc.language	en
dc.publisher	IOP Publishing
dc.relation.ispartof	2D Materials
dc.relation.isbasedon	10.1088/2053-1583/ac4060
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0303 Macromolecular and Materials Chemistry, 0912 Materials Engineering, 1007 Nanotechnology
dc.title	Higher-order topological superconductivity from repulsive interactions in kagome and honeycomb systems
dc.type	Journal Article
utslib.citation.volume	9
utslib.for	0303 Macromolecular and Materials Chemistry
utslib.for	0912 Materials Engineering
utslib.for	1007 Nanotechnology
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access	*
dc.date.updated	2023-03-10T02:10:50Z
pubs.issue	1
pubs.publication-status	Published
pubs.volume	9
utslib.citation.issue	1

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 AV3Sb5 (A = K, Rb, Cs) are discussed.

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http://hdl.handle.net/10453/166936