Impurity entropy of junctions of multiple quantum wires
Strongly Correlated Electrons
2016-07-20 v2
Abstract
We calculate the zero-temperature impurity entropy of a junction of multiple quantum wires of interacting spinless fermions. Starting from a given single-particle S-matrix representing a fixed point of the renormalization group (RG) flows, we carry out fermionic perturbation theory in the bulk interactions, with the perturbation series summed in the random phase approximation (RPA). The results agree completely with boundary conformal field theory (BCFT) predictions of the ground state degeneracy, and also with known RG flows through the g-theorem.
Keywords
Cite
@article{arxiv.1602.00068,
title = {Impurity entropy of junctions of multiple quantum wires},
author = {Zheng Shi},
journal= {arXiv preprint arXiv:1602.00068},
year = {2016}
}
Comments
21 pages, 4 figures