Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Hermitian Floquet second order topological insulators in
  periodically quenched lattices   Higher-order topological phases are characterized by protected states
localized at the corners or hinges of the system. By applying time-periodic
quenches to a two-dimensional lattice with balanced gain and loss, we obtain a
rich variety of non-Hermitian Floquet second order topological insulating
phases. Each of the phases is characterized by a pair of integer topological
invariants, which predict the numbers of Floquet corner modes at zero and $\pi$
quasienergies. We establish the topological phase diagram of the model, and
find a series of non-Hermiticity induced transitions between different Floquet
second order topological phases. We further generalize the mean chiral
displacement to two-dimensional non-Hermitian systems, and use it to extract
the topological invariants of our model dynamically. This work thus extend the
study of higher-order topological matter to more generic nonequilibrium
settings, in which the interplay between Floquet engineering and
non-Hermiticity yields fascinating new phases.

9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
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
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an