Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Manifestation of the shape and edge effects in spin-resolved transport
  through graphene quantum dots   We report on theoretical studies of transport through graphene quantum dots
weakly coupled to external ferromagnetic leads. The calculations are performed
by exact diagonalization of a tight-binding Hamiltonian with finite Coulomb
correlations for graphene sheet and by using the real-time diagrammatic
technique in the sequential and cotunneling regimes. The emphasis is put on the
role of graphene flake shape and spontaneous edge magnetization in transport
characteristics, such as the differential conductance, tunneling
magnetoresistance (TMR) and the shot noise. It is shown that for certain shapes
of the graphene dots a negative differential conductance and nontrivial
behavior of the TMR effect can occur.

32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat