d-wave charge-4e superconductivity from fluctuating pair density waves
Source abstract
Abstract
We present a theory for charge-4 e superconductivity as a leading low-temperature instability with a nontrivial d -wave symmetry. We show that in several microscopic models for the pair-density-wave (PDW) state, when the PDW wave vectors connect special parts of the Fermi surface, the predominant interaction is in the bosonic pairing channel mediated by exchanging low-energy fermions. This bosonic pairing interaction is repulsive in the s -wave channel but attractive in the d -wave one, leading to a d -wave charge-4 e superconductor. By analyzing the Ginzburg-Landau free energy including higher-order fluctuation effects of PDW, we find that the charge-4 e superconductivity emerges as a vestigial order of PDW, and sets in via a first-order transition. Both the gap amplitude and the transition temperature decay monotonically with increasing superfluid stiffness of the PDW order. Our work provides a microscopic mechanism of higher-charge condensates with unconventional ordering symmetry in strongly-correlated materials.
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Research context
OpenAlex topics: Physics of Superconductivity and Magnetism · Organic and Molecular Conductors Research · High-pressure geophysics and materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (62)
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