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 $Z_2$ time-reversal symmetry has been recently reported in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ with a doping level $x\approx 0.8$. 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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Cited by in corpus (10)

• Weak-Coupling Theory of Pair Density-Wave Instabilities in Transition Metal Dichalcogenides
• Calorimetric evidence for two phase transitions in Ba${}_{1-\mathrm{x}}$K${}_{\mathrm{x}}$Fe${}_2$As${}_2$ with fermion pairing and quadrupling states
• Prediction of time-reversal-symmetry breaking fermionic quadrupling condensate in twisted bilayer graphene
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• Cooper quartets in interacting hybrid superconducting systems
• Exactly Solvable Model of Randomly Coupled Twisted Superconducting Bilayers
• Microscopic theory of electron quadrupling condensates
• Ultrasound evidence for multicomponent superconducting order parameter in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ with electron quadrupling phase
• Microscopic properties of fractional vortices and domain walls in three-band $s+is$ superconductors
• Revisiting vestigial order in nematic superconductors: gauge-field mechanisms and model constraints