Notes on parafermionic QFT's with boundary interaction

TL;DR

This paper derives an analytical expression for the partition function of the circular brane model with boundary interactions, relevant for condensed matter physics, and connects it to boundary parafermionic sine-Gordon models.

Contribution

It provides a novel analytical solution for the partition function of the circular brane model at any topological angle, linking it to boundary parafermionic sine-Gordon models.

Findings

Analytical expression for the partition function derived.

Numerical Monte Carlo simulations confirm the analytical results.

Model applications include quantum dots and quantum wire junctions.

Abstract

The main result of these notes is an analytical expression for the partition function of the circular brane model for arbitrary values of the topological angle. The model has important applications in condensed matter physics. It is related to the dissipative rotator (Ambegaokar-Eckern-Schon) model and describes a ``weakly blocked'' quantum dot with an infinite number of tunneling channels under a finite gate voltage bias. A numerical check of the analytical solution by means of Monte Carlo simulations has been performed recently. To derive the main result we study the so-called boundary parafermionic sine-Gordon model. The latter is of certain interest to condensed matter applications, namely as a toy model for a point junction in the multichannel quantum wire.