Correlations in non-Hermitian systems and Diagram techniques for the steady state

Abstract

We describe a diagrammatic technique for non-Hermitian fermionic systems that is applicable in the steady state, and which allows addressing correlations effects by systematic expansion. Applying this method to exceptional points or rings, we find that nodal objects in non-Hermitian systems are generically displaced in momentum-space due to interactions. This in turn can be connected to the fact that exceptional points invariably break a class of orthonormal symmetries that are generally present for nodal points in Hermitian systems, and which protect the integrity of the node at low energy scales.

arXiv comment4 pages

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Cited by in corpus (8)

• Exceptional Topology of Non-Hermitian Systems
• Non-Hermitian Edge Burst
• Exceptional Spin Liquids from Couplings to the Environment
• Non-Hermitian skin effect in one-dimensional interacting Bose gas
• Interaction induced dynamical $\mathcal{P}\mathcal{T}$ symmetry breaking in dissipative Fermi-Hubbard models
• Chiral metals and entrapped insulators in a one-dimensional topological non-Hermitian system
• Unconventional steady states and topological phases in an open two-level non-Hermitian system
• Short-time behavior of a system ruled by non-Hermitian time-dependent Hamiltonians