Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental evidence of robust acoustic valley Hall edge states in a
  non-resonant topological elastic waveguide   This paper presents experimental evidence of the existence of acoustic valley
Hall (AVHE) edge states in topological elastic waveguides. The fundamental
lattice is assembled based on a non-resonant unit where space inversion
symmetry (SIS) is broken by simply perturbing the underlying lattice geometry.
This aspect is in net contrast with existing elastic AVHE designs that exploit
locally-resonant units and require the addition of masses in order to break
SIS. The experimental results presented in this study validate findings so far
presented only at theoretical and numerical level. In particular, it is found
that edge modes can effectively propagate along domain walls between
topologically dissimilar domains and that disorder-induced backscattering is
substantially suppressed due to the weak coupling between oppositely
valley-polarized modes. The coupling between valley modes is also further
investigated and linked to an evident chiral flux of the mechanical energy.
Finally, we show that the weak coupling between the valleys can be exploited to
achieve selective mode injection at the domain wall, hence realizing a very
effective excitation strategy of the chiral edge states.

19
The categories of this paper are: eess
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
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph