Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coupled Spin and Pseudo-magnetic Field in Graphene Nanoribbons   Pseudo-magnetic field becomes an experimental reality after the observation
of zero-field Landau level-like quantization in strained graphene, but it is
not expected that the time-reversal symmetric pseudo-magnetic fields will have
any effect on the spin degree of freedom of the charge carriers. Here, we
demonstrate that spin-orbit coupling (SOC) could act as a bridge between
pseudo-magnetic field and spin. In quantum spin Hall (QSH) states, the
direction of the spin of edge states is tied to their direction of motion
because of the SOC. The pseudo-magnetic field affects the clockwise and
counter-clock-wise edge currents of the QSH states, and consequently lifts the
degenerate edge states of opposite spin orientation. Because of opposite signs
of the pseudo-magnetic field in two valleys of graphene, the one-dimensional
charge carriers at the two opposite edges have different group velocities, and
in some special cases the edge states can only propagate at one edge of the
nanoribbon and the group velocity at the other edge becomes zero.

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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: dg-ga
1
The categories of this paper are: cs
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys