Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Aharonov-Bohm effect in graphene   We investigate experimentally transport through ring-shaped devices etched in
graphene and observe clear Aharonov-Bohm conductance oscillations. The
temperature dependence of the oscillation amplitude indicates that below 1 K
the phase coherence length is comparable to or larger than the size of the
ring. An increase in the amplitude is observed at high magnetic field, when the
cyclotron diameter becomes comparable to the width of the arms of the ring. By
measuring the dependence on gate voltage, we also observe an unexpected linear
dependence of the oscillation amplitude on the ring conductance, which had not
been reported earlier in rings made using conventional metals or semiconducting
heterostructures.

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The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: eess