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Title: Dynamic Control of Temperature Distributions in Stacks of Intrinsic Josephson Junctions in Bi[2]Sr[2]CaCu[2]O[8+δ] for Intense Terahertz Radiation
Authors: Tsujimoto, M.
Kambara, H.
Maeda, Y.
Yoshioka, Y.
Nakagawa, Y.
Kakeya, I.
Author's alias: 辻本, 学
掛谷, 一弘
Issue Date: 29-Oct-2014
Publisher: American Physical Society
Journal title: Physical Review Applied
Volume: 2
Issue: 4
Thesis number: 044016
Abstract: We study the universal relationship between the hot-spot size and the intensity of terahertz emission from intrinsic Josephson junctions by dynamically controlling the temperature distributions in mesas of Bi[2]Sr[2]CaCu[2]O[8+δ]. The uniform current bias leads to a significant increase in local temperature compared to the nonuniform current bias. The thermal response of emission differs between the high- and low-bias regimes. We find a strong positive correlation between the emission intensity and the volume of the superconducting parts in the emitting stack. We identify the remarkable increase in the emission intensity by up to 20% by eliminating the excess Joule heat from the mesa.
Description: 高温超伝導体を用いた新しいテラヘルツ光源における温度分布の可視化と制御に成功 -小型コヒーレントテラヘルツ光源の実現につながる重要な手がかり-. 京都大学プレスリリース. 2014-10-22.
Rights: © 2014 American Physical Society
URI: http://hdl.handle.net/2433/191073
DOI(Published Version): 10.1103/PhysRevApplied.2.044016
Related Link: http://www.kyoto-u.ac.jp/ja/research/research_results/2014/141022_1.html
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