Title

Spectral Investigation Of Hot Spot And Cavity Resonance Effects On The Terahertz Radiation From High-Tc Superconducting Bi2Sr2Cacu 2O8+Δ Mesas

Keywords

high temperature superconductivity; hot spots; Josephson junctions; mesa arrays; synchronization; terahertz emission

Abstract

Terahertz (THz) electromagnetic radiation emitted from single and series-connected rectangular mesa devices of high-Tc superconducting Bi2Sr2CaCu2O8+δ is investigated spectroscopically during simultaneous temperature distribution observations using a microcrystalline SiC photoluminescence technique. In single mesas, a hot-spot region with its temperature T locally exceeding Tc was observed to jump suddenly in position under small current I-bias changes. Although these hot-spot position jumps cause large changes in the output power with small changes in I, as long as the voltage V per junction number N is kept constant, they do not affect the output frequency f, which is given by the ac Josephson frequency fJ f can lock onto that of a particular mesa cavity resonance frequency fc, which enhances the emission power and serves as the primary mechanism for the synchronization of the emissions from each of the intrinsic Josephson junctions in the mesa. © 2014 IOP Publishing Ltd.

Publication Date

4-30-2014

Publication Title

Journal of Physics Condensed Matter

Volume

26

Issue

17

Number of Pages

-

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1088/0953-8984/26/17/172201

Socpus ID

84901741996 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84901741996

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