Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin transport in graphene nanostructures   Graphene is an interesting material for spintronics, showing long spin
relaxation lengths even at room temperature. For future spintronic devices it
is important to understand the behavior of the spins and the limitations for
spin transport in structures where the dimensions are smaller than the spin
relaxation length. However, the study of spin injection and transport in
graphene nanostructures is highly unexplored. Here we study the spin injection
and relaxation in nanostructured graphene with dimensions smaller than the spin
relaxation length. For graphene nanoislands, where the edge length to area
ratio is much higher than for standard devices, we show that enhanced spin-flip
processes at the edges do not seem to play a major role in the spin relaxation.
On the other hand, contact induced spin relaxation has a much more dramatic
effect for these low dimensional structures. By studying the nonlocal spin
transport through a graphene quantum dot we observe that the obtained values
for spin relaxation are dominated by the connecting graphene islands and not by
the quantum dot itself. Using a simple model we argue that future nonlocal
Hanle precession measurements can obtain a more significant value for the spin
relaxation time for the quantum dot by using high spin polarization contacts in
combination with low tunneling rates.

32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph