Pseudo-spin Skyrmions in the Phase Diagram of Cuprate Superconductors

Abstract

Topological states of matter are at the root of some of the most fascinating phenomena in condensed matter physics. Here we argue that skyrmions in the pseudo-spin space related to an emerging SU(2) symmetry enlighten many mysterious properties of the pseudogap phase in under-doped cuprates. We detail the role of the SU(2) symmetry in controlling the phase diagram of the cuprates, in particular how a cascade of phase transitions explains the arising of the pseudogap, superconducting and charge modulation phases seen at low temperature. We specify the structure of the charge modulations inside the vortex core below $T_c$, as well as in a wide temperature region above $T_c$, which is a signature of the skyrmion topological structure. We argue that the underlying SU(2) symmetry is the main structure controlling the emergent complexity of excitations at the pseudogap scale $T^{\ast }$. The theory yields a gapping of a large part of the anti-nodal region of the Brillouin zone, along with $q=0$ phase transitions, of both nematic and loop currents characters.

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Cited by in corpus (5)

• Fractionalized pair density wave in the pseudo-gap phase of cuprate superconductors
• Building traps for skyrmions by the incorporation of magnetic defects into nanomagnets: pinning and scattering traps by magnetic properties engineering
• Loop currents in quantum matter
• Orientation of the intra-unit-cell magnetic moment in the high-Tc superconductor HgBa2CuO${}_{4+\delta }$
• Evidence for Intra-Unit Cell Magnetism in Superconducting Cuprates: a Technical Assessment