Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electrically tunable charge and spin transitions in Landau levels of
  interacting Dirac fermions in trilayer graphene   Trilayer graphene in the fractional Quantum Hall Effect regime displays a set
of unique interaction-induced transitions that can be tuned entirely by the
applied bias voltage. These transitions occur near the anti-crossing points of
two Landau levels. In a large magnetic field ($> 8$ T) the electron-electron
interactions close the anti-crossing gap, resulting in some unusual transitions
between different Landau levels. For the filling factor $\nu=\frac23$, these
transitions are accompanied by a change of spin polarization of the ground
state. For a small Zeeman energy, this provides an unique opportunity to
control the spin polarization of the ground state by fine tuning the bias
voltage.

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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
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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: chao-dyn
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio