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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

$ $The critical current of a Josephson junction is an oscillatory function ofthe enclosed magnetic flux $\Phi$, because of quantum interference modulatedwith periodicity $h/2e$. We calculate these Fraunhofer oscillations in atwo-dimensional (2D) ballistic superconductor--normal-metal--superconductor(SNS) junction. For a Fermi circle the amplitude of the oscillations decays as$1/\Phi$ or faster. If the Fermi circle is strongly warped, as it is on asquare lattice near the band center, we find that the amplitude decays slower$\propto 1/\sqrt\Phi$ when the magnetic length $l_m=\sqrt{\hbar/eB}$ dropsbelow the separation $L$ of the NS interfaces. The crossover to the slow decayof the critical current is accompanied by the appearance of a 2D array ofcurrent vortices and antivortices in the normal region, which form a bipartiterectangular lattice with lattice constant $\simeq l_m^2/L$. The 2D latticevanishes for a circular Fermi surface, when only the usual single row ofJosephson vortices remains.

physical review. b./physical review. b

Two-dimensional Josephson vortex lattice and anomalously slow decay of  the Fraunhofer oscillations in a ballistic SNS junction with a warped Fermi  surface