Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: THz-circuits driven by photo-thermoelectric graphene-junctions   For future on-chip communication schemes, it is essential to integrate
nanoscale materials with an ultrafast optoelectronic functionality into
high-frequency circuits. The atomically thin graphene has been widely
demonstrated to be suitable for photovoltaic and optoelectronic devices because
of its broadband optical absorption and its high electron mobility. Moreover,
the ultrafast relaxation of photogenerated charge carriers has been verified in
graphene. Here, we show that dual-gated graphene junctions can be functional
parts of THz-circuits. As the underlying optoelectronic process, we exploit
ultrafast photo-thermoelectric currents. We describe an immediate
photo-thermoelectric current of the unbiased device following a femtosecond
laser excitation. For a picosecond time-scale after the optical excitation, an
additional photo-thermoelectric contribution shows up, which exhibits the
fingerprint of a spatially inverted temperature profile. The latter can be
understood by the different time-constants and thermal coupling mechanisms of
the electron and phonon baths within graphene to the substrate and the metal
contacts. The interplay of the processes gives rise to ultrafast
electromagnetic transients in high-frequency circuits, and it is equally
important for a fundamental understanding of graphene-based ultrafast
photodetectors and switches.

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The categories of this paper are: hep-ph
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an