Meissner effect without superconductivity from a chiral d-density wave

TL;DR

This paper shows that a chiral d-density wave state can produce a topological Meissner effect similar to superconductivity, explaining enhanced diamagnetism in cuprates' pseudogap phase without requiring superconductivity.

Contribution

It introduces a topological Meissner effect arising from a chiral d-density wave, providing an alternative explanation for diamagnetic signals in non-superconducting cuprate regimes.

Findings

Chiral d-density wave induces a topological Meissner effect

The effect occurs only for magnetic fields perpendicular to the plane

Explains diamagnetic signals in cuprates' pseudogap phase

Abstract

We demonstrate that the formation of a chiral d-density wave (CDDW) state generates a Topological Meissner effect (TME) in the absence of any kind of superconductivity. The TME is identical to the usual superconducting Meissner effect but it appears only for magnetic fields perpendicular to the plane while it is absent for in plane fields. The observed enhanced diamagnetic signals in the non-superconducting pseudogap regime of the cuprates may find an alternative interpretation in terms of a TME, originating from a chiral d-density wave pseudogap.