Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A note on topological insulator phase in non-hermitian quantum systems   Examples of non-hermitian quantum systems admitting topological insulator
phase are presented in one, two and three space dimensions. All of these
non-hermitian Hamiltonians have entirely real bulk eigenvalues and unitarity is
maintained with the introduction of appropriate inner-products in the
corresponding Hilbert spaces. The topological invariant characterizing a
particular phase is shown to be identical for a non-hermitian Hamiltonian and
its hermitian counterpart, to which it is related through a non-unitary
similarity transformation. A classification scheme for topological insulator
phases in pseudo-hermitian quantum systems is suggested.

11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg