Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Hermitian Dirac Cones   Non-Hermitian systems, which contain gain or loss, commonly host exceptional
point degeneracies rather than the diabolic points found in Hermitian systems.
We present a class of non-Hermitian lattice models with symmetry-stabilized
diabolic points, such as Dirac or Weyl points. They exhibit
non-Hermiticity-induced phenomena previously existing in the Hermitian regime,
including topological phase transitions, Landau levels induced by
pseudo-magnetic fields, and Fermi arc surface states. These behaviors are
controllable via gain and loss, with promising applications in tunable active
topological devices.

18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
2
The categories of this paper are: math
9
The categories of this paper are: nlin