Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of chiral quantum-Hall edge states in graphene   In this study, we determined the chiral direction of the quantum-Hall (QH)
edge states in graphene by adopting simple two-terminal conductance
measurements while grounding different edge positions of the sample. The edge
state with a smaller filling factor is found to more strongly interact with the
electric contacts. This simple method can be conveniently used to investigate
the chirality of the QH edge state with zero filling factor in graphene, which
is important to understand the symmetry breaking sequence in high magnetic
fields ($\gtrsim$25 T).

18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg