Emergent loop current order from pair density wave superconductivity

Abstract

There is evidence that the pseudogap phase in the cuprates breaks time-reversal symmetry. Here we show that pair density wave (PDW) states give rise to a translational invariant nonsuperconducting order parameter that breaks time-reversal and parity symmetries, but preserves their product. This secondary order parameter has a different origin, but shares the same symmetry properties as a magnetoelectric loop current order that has been proposed earlier in the context of the cuprates to explain the appearance of intracell magnetic order. We further show that, due to fluctuations, this secondary loop current order, which breaks only discrete symmetries, can preempt PDW order, which breaks both continuous and discrete symmetries. In such a phase, the emergent loop current order coexists with spatial short-range superconducting order and possibly short-range charge density wave (CDW) order. Finally, we propose a PDW phase that accounts for intracell magnetic order and the Kerr effect, has CDW order consistent with x-ray scattering and nuclear magnetic resonance observations, and quasi-particle properties consistent with angle-resolved photoemission scattering.

Typos corrected and References updated

References in corpus (6)

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Cited by in corpus (5)

• Coexistence of charge-density-wave and pair-density-wave orders in underdoped cuprates
• Interplay between pair-density-wave and charge-density-wave orders in underdoped cuprates
• Checkerboard order in vortex cores from pair-density-wave superconductivity
• SU(2)-symmetry in a realistic spin-fermion model for cuprate superconductors
• Superconducting and charge-density-wave orders in the spin-fermion model: a comparative analysis