Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tunable Valley Splitting due to Topological Orbital Magnetic Moment in
  Bilayer Graphene Quantum Point Contacts   In multivalley semiconductors, the valley degree of freedom can be
potentially used to store, manipulate and read quantum information, but its
control remains challenging. The valleys in bilayer graphene can be addressed
by a perpendicular magnetic field which couples by the valley g-factor.
However, control over the valley g-factor has not been demonstrated yet. We
experimentally determine the energy spectrum of a quantum point contact
realized by a suitable gate geometry in bilayer graphene. Using finite bias
spectroscopy we measure the energy scales arising from the lateral confinement
as well as the Zeeman splitting and find a spin g-factor of 2. The valley
g-factor can be tuned by a factor of 3 using vertical electric fields, reaching
values between 40 and 120. The results are quantitatively explained by a
calculation considering topological magnetic moment and its dependence on
confinement and the vertical displacement field.

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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ph
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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th