English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We re-examined the angular dependence of the radiation from the intrinsicJosephson junctions in rectangular mesas of Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$,in order to determine if the cavity mode part of the radiation arises fromwaves across the width $w$ or along the length $\ell$ of the mesas, associatedwith ``hot spots'' [Wang {\it et al.}, Phys. Rev. Lett. {\bf 105}, 057002(2010)]. We derived analytic forms for the angular dependence expected in bothcases for a general cavity mode in which the width of the mesa corresponds toan integer multiple of one-half the wavelength of the radiation. Assuming thecoherent radiation from the $ac$ Josephson current source and the cavitymagnetic surface current density source combine incoherently, fits to the dataof Kadowaki {\it et al.} [J. Phys. Soc. Jpn. {\bf 79}, 023703 (2010)] on a mesawith mean $\ell/w=5.17$ for both wave directions using two models for theincoherent combination were made, which correspond to standing and travelingwaves, respectively. The results suggest that the combined output from theuniform $ac$ Josephson current source plus a cavity wave forming along therectangle length is equally probable as that of the combined output from theuniform $ac$ Josephson current plus a cavity wave across the width. However,for mesas in which $n\ell/2w$ is integral, where $n$ is the index of therectangular TM$^z_{n,0}$ mode, it is shown that standing cavity mode wavesalong the length of the mesa do not radiate in the $xz$ plane perpendicular tothe length of the mesa, suggesting experiments on such mesas could help toresolve the question.

Cavity mode waves during terahertz radiation from rectangular Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ mesas