Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transport properties of graphene quantum dots   In this work we present a theoretical study of transport properties of a
double crossbar junction composed by segments of graphene ribbons with
different widths forming a graphene quantum dot structure. The systems are
described by a single-band tight binding Hamiltonian and the Green's function
formalism using real space renormalization techniques. We show calculations of
the local density of states, linear conductance and I-V characteristics. Our
results depict a resonant behavior of the conductance in the quantum dot
structures which can be controlled by changing geometrical parameters such as
the nanoribbon segments widths and relative distance between them. By applying
a gate voltage on determined regions of the structure, it is possible to
modulate the transport response of the systems. We show that negative
differential resistance can be obtained for low values of gate and bias
voltages applied.

8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs