Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological properties in the non-Hermitian tetramerized
  Su-Schrieffer-Heeger lattices   In this paper, we study the topological properties of the non-Hermitian
Su-Schrieffer-Heeger (SSH) lattice by periodically introducing onsite imaginary
potentials in the manner of ($i\gamma_1$, $-i\gamma_2$, $-i\gamma_1$,
$i\gamma_2$) where $\gamma_1$ and $\gamma_2$ are the imaginary potential
strengths. Results show that by changing the lattice to a tetramerized
non-Hermitian system, such imaginary potentials induce the nontrivial
transition of the topological properties of the SSH system. First, the
topologically-nontrivial region is extended, followed by the non-Hermitian
spontaneous breaking of the anti-$\cal PT$ symmetry. In addition, new edge
state appears, but its locality is different from the state induced by the
Hermitian SSH lattice. If such potentials are strong enough, the bulk states of
this system can become purely imaginary states. We believe that these imaginary
potentials play special roles in modulating the topological properties of the
non-Hermitian SSH lattice.

27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: gr-qc