Effects of intercomponent couplings on the appearance of time-reversal symmetry breaking fermion quadrupling state in two-component London models
Abstract
A detection of bosonic metallic state that breaks the Z2 time-reversal symmetry has been recently reported in Ba1-xKxFe2As2 with a doping level x ≈ 0.8. This is a metallic state of fermionic quadruplets that breaks time-reversal symmetry. As such, it has no condensate of Cooper pairs but has a long-range order between fermionic quartets. In the present manuscript, we investigate the emergence of this phase in a two-component London model via Monte Carlo simulations as a function of various intercomponent couplings.
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