Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Absence of in-gap modes in charge density wave edge dislocations of the
  Weyl semimetal (TaSe$_4$)$_2$I   Axion electrodynamics in condensed matter could emerge from the formation of
charge density waves (CDWs) in Weyl semimetals. (TaSe$_4$)$_2$I was proposed to
be the first material platform for realizing axionic CDW that may host
topological defects with one-dimensional in-gap modes. The real-space
modulation of the CDW phase and the existence of in-gap modes remain elusive.
Here, we present a comprehensive scanning tunneling microscopic and
spectroscopic study of a CDW on a (TaSe$_4$)$_2$I (110) surface. The tunneling
spectroscopic measurements reveal a CDW gap of $\sim 200$ meV, in good
agreement with prior studies, while the spectroscopy of CDW edge dislocation
shows no indication of in-gap states. The bias-dependent scanning tunneling
microscopy images indicate that the CDW in(TaSe$_4$)$_2$I is dominated by a
large periodic lattice distortion instead of charge modulation, suggesting a
non-Peierls mechanism of the CDW instability.

34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs