Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Substantial local variation of Seebeck coefficient in gold nanowires   Nanoscale structuring holds promise to improve thermoelectric properties of
materials for energy conversion and photodetection. We report a study of the
spatial distribution of the photothermoelectric voltage in thin-film nanowire
devices fabricated from single metal. A focused laser beam is used to locally
heat the metal nanostructure via a combination of direct absorption and
excitation of a plasmon resonance in Au devices. As seen previously, in
nanowires shorter than the spot size of the laser, we observe a thermoelectric
voltage distribution that is consistent with the local Seebeck coefficient
being spatially dependent on the width of the nanostructure. In longer
structures, we observe extreme variability of the net thermoelectric voltage as
the laser spot is scanned along the length of the nanowire. The sign and
magnitude of the thermoelectric voltage is sensitive to the structural defects,
metal grain structure, and surface passivation of the nanowire. This finding
opens the possibility of improved local control of the thermoelectric
properties at the nanoscale.

2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th