Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron-electron interactions in bilayer graphene quantum dots   A parabolic quantum dot (QD) as realized by biasing nanostructured gates on
bilayer graphene is investigated in the presence of electron-electron
interaction. The energy spectrum and the phase diagram reveal unexpected
transitions as function of a magnetic field. For example, in contrast to
semiconductor QDs, we find a novel valley transition rather than only the usual
singlet-triplet transition in the ground state of the interacting system. The
origin of these new features can be traced to the valley degree of freedom in
bilayer graphene. These transitions have important consequences for cyclotron
resonance experiments.

1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn