On the Sign of Fermion-Mediated Interactions
Mesoscale and Nanoscale Physics
2021-03-17 v3 High Energy Physics - Theory
Quantum Physics
Abstract
We develop a unified framework for understanding the sign of fermion-mediated interactions by exploiting the symmetry classification of Green's functions. In particular, we establish a theorem regarding the sign of fermion-mediated interactions in systems with chiral symmetry. The strength of the theorem is demonstrated within multiple examples with an emphasis on electron-mediated interactions in materials.
Keywords
Cite
@article{arxiv.2009.08095,
title = {On the Sign of Fermion-Mediated Interactions},
author = {Qing-Dong Jiang},
journal= {arXiv preprint arXiv:2009.08095},
year = {2021}
}
Comments
Published version with additional examples including twisted-bilayer models and SU(N) spin interactions