On the Sign of Fermion-Mediated Interactions
arXiv:2009.08095 · doi:10.1103/PhysRevB.103.L121107
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.
arXiv commentPublished version with additional examples including twisted-bilayer models and SU(N) spin interactions
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