arXiv Analytics

Sign in

arXiv:2403.19445 [cond-mat.supr-con]AbstractReferencesReviewsResources

Long-range Phase Coherence and Tunable Second Order $φ_0$-Josephson Effect in a Dirac Semimetal $1T-PtTe_2$

Pranava K. Sivakumar, Mostafa T. Ahari, Jae-Keun Kim, Yufeng Wu, Anvesh Dixit, George J. de Coster, Avanindra K. Pandeya, Matthew J. Gilbert, Stuart S. P. Parkin

Published 2024-03-28Version 1

Superconducting diode effects have recently attracted much attention for their potential applications in superconducting logic circuits. Several mechanisms such as magneto-chiral effects, finite momentum Cooper pairing, asymmetric edge currents have been proposed to give rise to a supercurrent diode effect in different materials. In this work, we establish the presence of a large intrinsic Josephson diode effect in a type-II Dirac semimetal $1T-PtTe_2$ facilitated by its helical spin-momentum locking and distinguish it from other extrinsic effects. The magnitude of the Josephson diode effect is shown to be directly correlated to the large second-harmonic component of the supercurrent that is induced by the significant contribution of the topological spin-momentum locked states that promote coherent Andreev processes in the junction. We denote such junctions, where the relative phase between the two harmonics corresponding to charge transfers of $2e$ and $4e$ can be tuned by a magnetic field, as second order ${\phi}_0$-junctions. The direct correspondence between the second harmonic supercurrent component and the diode effect in $1T-PtTe_2$ junctions makes topological semimetals with high transparency an ideal platform to study and implement the Josephson diode effect, while also enabling further research on higher order supercurrent transport in Josephson junctions.

Related articles: Most relevant | Search more
arXiv:1801.04365 [cond-mat.supr-con] (Published 2018-01-13)
π and 4π Josephson Effects Mediated by a Dirac Semimetal
arXiv:cond-mat/0401374 (Published 2004-01-20, updated 2004-05-27)
A New Approach to the Josephson Effect
arXiv:1702.01918 [cond-mat.supr-con] (Published 2017-02-07)
Josephson effect in a multi-orbital model for Sr$_{2}$RuO$_{4}$