Fermion zero mode and superfluid weight

TL;DR

This paper explores a theoretical mechanism involving fermion zero modes and meron vortices that explains the doping-independent decrease in superfluid weight in certain quantum systems.

Contribution

It introduces a novel SU(2) slave-boson effective field theory approach showing how isospin interactions lead to fermion zero modes and meron vortices affecting superfluid properties.

Findings

Fermion zero modes arise in instanton-hedgehog configurations due to isospin interactions.

Meron-type vortices are enabled, influencing superfluid behavior.

Superfluid weight decreases independently of doping levels, explained by vortex emergence.

Abstract

We propose one possible mechanism for deconfinement based on an SU(2) slave-boson theory. Resorting to an effective field theory approach, we show that introduction of an isospin interaction potential gives rise to a fermion zero mode in an instanton-hedgehog configuration. As a result, meron-type vortices are allowed. We demonstrate how emergence of such vortices results in the doping-independent decreasing ratio of superfluid weight.