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The ac Josephson relation and inhomogeneous temperature distributions in large Bi2Sr2CaCu2O8+δmesas for THz emission
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Benseman, T. M., Koshelev, A. E., Kwok, W-K., Welp, U., Kadowaki, K., Cooper, J. R. and Balakrishnan, G. (2013) The ac Josephson relation and inhomogeneous temperature distributions in large Bi2Sr2CaCu2O8+δmesas for THz emission. Superconductor Science and Technology, Volume 26 (Number 8). Article number 085016. doi:10.1088/0953-2048/26/8/085016 ISSN 0953-2048.
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Official URL: http://dx.doi.org/10.1088/0953-2048/26/8/085016
Abstract
We have studied the terahertz emission from a 720 × 60 × 1.2 μm3 mesa patterned from under-doped Bi2Sr2CaCu2O8+δ. This device has an S-shaped current–voltage characteristic due to self-heating, allowing us to compare its THz emission behaviours at up to three different bias currents for the same voltage. The THz frequency generated along the lowest current branch follows the expected Josephson relation for a stack of intrinsic Josephson junctions connected in series. However, in the high current regimes, THz emission occurs at a significantly lower frequency than expected. We show that this behaviour is consistent with strongly non-uniform self-heating of the mesa at high bias currents.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Superconductor Science and Technology | ||||
Publisher: | Institute of Physics Publishing Ltd. | ||||
ISSN: | 0953-2048 | ||||
Official Date: | August 2013 | ||||
Dates: |
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Volume: | Volume 26 | ||||
Number: | Number 8 | ||||
Page Range: | Article number 085016 | ||||
DOI: | 10.1088/0953-2048/26/8/085016 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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