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Journal Articles Physical Review Letters Year : 2022

Effective Model and Magnetic Properties of the Resistive Electron Quadrupling State

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Julien Garaud

Abstract

Recent experiments [Grinenko et al. Nat. Phys. 17, 1254 (2021)] reported the observation of a condensate of four-fermion composites. This is a resistive state that spontaneously breaks the time-reversal symmetry, leading to unconventional magnetic properties, detected in muon spin rotation experiments and by the appearance of a spontaneous Nernst effect. In this Letter, we derive an effective model for the four-fermion order parameter that describes the observed spontaneous magnetic fields in this state. We show that this model, which is alike to the Faddeev-Skyrme model can host skyrmions: magnetic-flux-carrying topological excitations.
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Dates and versions

hal-03482066 , version 1 (07-12-2022)

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Julien Garaud, Egor Babaev. Effective Model and Magnetic Properties of the Resistive Electron Quadrupling State. Physical Review Letters, 2022, 129 (8), pp.087602. ⟨10.1103/PhysRevLett.129.087602⟩. ⟨hal-03482066⟩
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