Coupled wire models of interacting Dirac nodal superconductors

Article

关键词: INCOMPRESSIBLE QUANTUM FLUID;    SEMIMETAL;    QUANTIZATION;    DISCOVERY;    FERMIONS;   

DOI  :  10.1103/PhysRevB.98.184514

来源: SCIE

【 摘 要 】

Topological nodal superconductors possess gapless low energy excitations that are characterized by point or line nodal Fermi surfaces. In this work, using a coupled wire construction, we study topological nodal superconductors that have protected Dirac nodal points. In this construction, the low-energy electronic degrees of freedom are confined in a three-dimensional array of wires, which emerge as pairing vortices of a microscopic superconducting system. The vortex array harbors an antiferromagnetic time-reversal and a mirror glide symmetry that protect the massless Dirac fermion in the single-body noninteracting limit. Within this model, we demonstrate exact-solvable many-body interactions that preserve the underlying symmetries and introduce a finite excitation energy gap. These gapping interactions support fractionalization and generically lead to nontrivial topological order. We also construct a special case of N = 16 Dirac fermions where the corresponding gapping interaction leads to a trivial E-8 topological order that is closely related to the cancellation of the large gravitational anomaly.

【 授权许可】

Free