Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Crossover from Room-temperature Double-channel Ballistic Transport to
  Single-channel Ballistic Transport in Zigzag Graphene Nanoribbons   Very recently, it was demonstrated explicitly that a zigzag graphene
nanoribbon (GNR) exhibits a crossover of conductance from G0 to G0/2 with
increasing the length (G0 = 2e2/h is the quantum of conductance) even at
room-temperature [Baringhaus, et al. Nature 506, 349 (2014)]. Such a result is
puzzling as none of previous theories seem to match the experimental
observations. Here, we propose a model to explain the crossover from
double-channel to single-channel ballistic transport in zigzag GNR. The sp3
distortion of carbon atoms at the GNR edges induces a large spin-orbit coupling
on the edges atoms, which enhances spin-flip scattering of edge states of the
zigzag GNR. With sufficient spin-flip scattering, the wave-function of edge
states becomes a superposition of the spin-up and spin-down components. Then
the coupling of the two edges becomes important. This removes the edge degree
of freedom in the zigzag GNR and results in the evolution of the conductance
from G0 to G0/2 with increasing the length.

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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: physics
2
The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph