Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-thermal response of YBCO thin films to picosecond THz pulses   The photoresponse of YBa2Cu3O7-d thin film microbridges with thicknesses
between 15 and 50 nm was studied in the optical and terahertz frequency range.
The voltage transients in response to short radiation pulses were recorded in
real time with a resolution of a few tens of picoseconds. The bridges were
excited by either femtosecond pulses at a wavelength of 0.8 \mu m or broadband
(0.1 - 1.5 THz) picosecond pulses of coherent synchrotron radiation. The
transients in response to optical radiation are qualitatively well explained in
the framework of the two-temperature model with a fast component in the
picosecond range and a bolometric nanosecond component whose decay time depends
on the film thickness. The transients in the THz regime showed no bolometric
component and had amplitudes up to three orders of magnitude larger than the
two-temperature model predicts. Additionally THz-field dependent transients in
the absence of DC bias were observed. We attribute the response in the THz
regime to a rearrangement of vortices caused by high-frequency currents.

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The categories of this paper are: eess
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: math
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an