Critical fluctuations at a many-body exceptional point

Abstract

This paper proposes a non-Hermitian class of dynamic critical phenomenon beyond the classification by Hohenberg and Halperin triggered by the coalescence of the collective eigenmodes to the Goldstone mode. The authors find an anomalous enhancement of fluctuations that diverge at $d\ensuremath{\le}4$, and many-body correlation effects that become relevant at $d<8$.

Topics & Concepts