Transverse Meissner Physics of Planar Superconductors with Columnar Pins

TL;DR

This paper investigates the non-Hermitian quantum phase transition related to the destruction of the Bose glass phase in tilted magnetic fields of Type II superconductors, providing exact results in (1+1)-dimensions.

Contribution

It introduces an exact analysis of the non-Hermitian quantum phase transition in (1+1)-dimensions, considering both site and bond randomness in the context of vortex line physics.

Findings

Exact solutions for the non-Hermitian transition in (1+1)-dimensions.

Analysis of the effects of site and bond randomness.

Application of real space renormalization group methods to non-Hermitian models.

Abstract

The statistical mechanics of thermally excited vortex lines with columnar defects can be mapped onto the physics of interacting quantum particles with quenched random disorder in one less dimension. The destruction of the Bose glass phase in Type II superconductors, when the external magnetic field is tilted sufficiently far from the column direction, is described by a poorly understood non-Hermitian quantum phase transition. We present here exact results for this transition in (1+1)-dimensions, obtained by mapping the problem in the hard core limit onto one-dimensional fermions described by a non-Hermitian tight binding model. Both site randomness and the relatively unexplored case of bond randomness are considered. Analysis near the mobility edge and near the band center in the latter case is facilitated by a real space renormalization group procedure used previously for Hermitian quantum problems with quenched randomness in one dimension.