Thermodynamic and dynamical properties of a model of Dirac fermions with a deconfined quantum critical point (DQCP) separating an interaction-generated quantum spin-Hall insulator from an s-wave superconductor [Nature Comm.~{\bf 10}, 2658 (2019)] are studied by quantum Monte Carlo simulations. Inside the deconfined quantum critical region bound by the single-particle gap, spinons and spinless charge-2e skyrmions emerge. Since the model conserves total spin and charge, and has a single length scale, these excitations lead to a characteristic linear temperature dependence of the uniform spin and charge susceptibilities. At the DQCP, the order parameter dynamic structure factors show remarkable similarities that support emergent Lorentz symmetry. Above a critical temperature, superconductivity is destroyed by the proliferation of spin-1/2 vortices.
@article{arxiv.2110.07963,
title = {Thermodynamic and Dynamical Signatures of a Quantum Spin-Hall Insulator to Superconductor Transition},
author = {Martin Hohenadler and Yuhai Liu and Toshihiro Sato and Zhenjiu Wang and Wenan Guo and Fakher F. Assaad},
journal= {arXiv preprint arXiv:2110.07963},
year = {2022}
}