Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Correlations in non-Hermitian systems and Diagram techniques for the
  steady state   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.

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The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int