Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intrinsic Negative Poisson's Ratio for Single-Layer Graphene   Negative Poisson's ratio (NPR) materials have drawn significant interest
because the enhanced toughness, shear resistance and vibration absorption that
typically are seen in auxetic materials may enable a range of novel
applications. In this work, we report that single-layer graphene exhibits an
intrinsic NPR, which is robust and independent of its size and temperature. The
NPR arises due to the interplay between two intrinsic deformation pathways (one
with positive Poisson's ratio, the other with NPR), which correspond to the
bond stretching and angle bending interactions in graphene. We propose an
energy-based deformation pathway criteria, which predicts that the pathway with
NPR has lower energy and thus becomes the dominant deformation mode when
graphene is stretched by a strain above 6%, resulting in the NPR phenomenon.

23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg