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28 March 2024
 
  » arxiv » 1811.2583

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Superconductivity from the Condensation of Topological Defects in a Quantum Spin-Hall Insulator
Yuhai Liu ; Zhenjiu Wang ; Toshihiro Sato ; Martin Hohenadler ; Chong Wang ; Wenan Guo ; Fakher F. Assaad ;
Date 6 Nov 2018
AbstractThe discovery that spin-orbit coupling can generate a new state of matter in the form of quantum spin-Hall (QSH) insulators has brought topology to the forefront of condensed matter physics. While QSH states from spin-orbit coupling can be fully understood in terms of band theory, fascinating many-body effects are expected if the state instead results from interaction-generated symmetry breaking. In particular, topological defects of the corresponding order parameter provide a route to exotic quantum phase transitions. Here, we introduce a model in which the condensation of skyrmion defects in an interaction-generated QSH insulator produces a superconducting (SC) phase. Because vortex excitations of the latter carry a spin-$1/2$ degree of freedom numbers, the SC order may be understood as emerging from a gapless spin liquid normal state. The QSH-SC transition is an example of a deconfined quantum critical point (DQCP), for which we provide an improved model with only a single length scale that is accessible to large-scale quantum Monte Carlo simulations.
Source arXiv, 1811.2583
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