Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of bulk boundary correspondence breakdown in topolectrical
  circuits   The study of the laws of nature has traditionally been pursued in the limit
of isolated systems, where energy is conserved. This is not always a valid
approximation, however, as the inclusion of features like gain and loss, or
periodic driving, qualitatively amends these laws. A contemporary frontier of
meta-material research is the challenge open systems pose to the established
characterization of topological matter. There, one of the most relied upon
principles is the bulk-boundary correspondence (BBC), which intimately relates
the properties of the surface states to the topological classification of the
bulk. The presence of gain and loss, in combination with the violation of
reciprocity, has recently been predicted to affect this principle dramatically.
Here, we report the experimental observation of BBC violation in a
non-reciprocal topolectric circuit. The circuit admittance spectrum exhibits an
unprecedented sensitivity to the presence of a boundary, displaying an
extensive admittance mode localization despite a translationally invariant
bulk. Intriguingly, we measure a non-local voltage response due to broken BBC.
Depending on the AC current feed frequency, the voltage signal accumulates at
the left or right boundary, and increases as a function of nodal distance to
the current feed.

2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio