Superconductivity from the condensation of topological defects in a quantum spin-Hall insulator.

Abstract:

:The discovery of quantum spin-Hall (QSH) insulators has brought topology to the forefront of condensed matter physics. While a QSH state from spin-orbit coupling can be fully understood in terms of band theory, fascinating many-body effects are expected if it instead results from spontaneous symmetry breaking. Here, we introduce a model of interacting Dirac fermions where a QSH state is dynamically generated. Our tuning parameter further allows us to destabilize the QSH state in favour of a superconducting state through proliferation of charge-2e topological defects. This route to superconductivity put forward by Grover and Senthil is an instance of a deconfined quantum critical point (DQCP). Our model offers the possibility to study DQCPs without a second length scale associated with the reduced symmetry between field theory and lattice realization and, by construction, is amenable to large-scale fermion quantum Monte Carlo simulations.

journal_name

Nat Commun

journal_title

Nature communications

authors

Liu Y,Wang Z,Sato T,Hohenadler M,Wang C,Guo W,Assaad FF

doi

10.1038/s41467-019-10372-0

subject

Has Abstract

pub_date

2019-06-14 00:00:00

pages

2658

issue

1

issn

2041-1723

pii

10.1038/s41467-019-10372-0

journal_volume

10

pub_type

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