TY - JOUR
T1 - Long-range phase coherence and tunable second order φ0-Josephson effect in a Dirac semimetal 1T-PtTe2
AU - Sivakumar, Pranava K.
AU - Ahari, Mostafa T.
AU - Kim, Jae Keun
AU - Wu, Yufeng
AU - Dixit, Anvesh
AU - de Coster, George J.
AU - Pandeya, Avanindra K.
AU - Gilbert, Matthew J.
AU - Parkin, Stuart S.P.
N1 - P.K.S. would like to thank Niels Schr\u00F6ter for useful discussions. S.S.P.P. acknowledges support from the European Union (European Research Council Advanced Grant SUPERMINT, project number 101054860). Views and opinions expressed are however those of the authors only and do not necessarily reflect those of the European Union or the European Research Council. Neither the European Union nor the granting authority can be held responsible for them. M.T.A. acknowledges support from the NSF through the University of Illinois at Urbana-Champaign Materials Research Science and Engineering Center DMR-1720633.
PY - 2024/12
Y1 - 2024/12
N2 - Superconducting diode effects have recently attracted much attention for their potential applications in superconducting logic circuits. Several pathways have been proposed to give rise to non-reciprocal critical currents in various superconductors and Josephson junctions. In this work, we establish the presence of a large Josephson diode effect in a type-II Dirac semimetal 1T-PtTe2 facilitated by its helical spin-momentum locking and distinguish it from extrinsic geometric effects. The magnitude of the Josephson diode effect is shown to be directly correlated to the large second-harmonic component of the supercurrent. We denote such junctions, where the relative phase between the two harmonics can be tuned by a magnetic field, as ‘tunable second order φ0-junctions’. The direct correspondence between the second harmonic supercurrents and the diode effect in 1T-PtTe2 junctions at relatively low magnetic fields makes it an ideal platform to study the Josephson diode effect and Cooper quartet transport in Josephson junctions.
AB - Superconducting diode effects have recently attracted much attention for their potential applications in superconducting logic circuits. Several pathways have been proposed to give rise to non-reciprocal critical currents in various superconductors and Josephson junctions. In this work, we establish the presence of a large Josephson diode effect in a type-II Dirac semimetal 1T-PtTe2 facilitated by its helical spin-momentum locking and distinguish it from extrinsic geometric effects. The magnitude of the Josephson diode effect is shown to be directly correlated to the large second-harmonic component of the supercurrent. We denote such junctions, where the relative phase between the two harmonics can be tuned by a magnetic field, as ‘tunable second order φ0-junctions’. The direct correspondence between the second harmonic supercurrents and the diode effect in 1T-PtTe2 junctions at relatively low magnetic fields makes it an ideal platform to study the Josephson diode effect and Cooper quartet transport in Josephson junctions.
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U2 - 10.1038/s42005-024-01825-0
DO - 10.1038/s42005-024-01825-0
M3 - Article
C2 - 39478871
AN - SCOPUS:85208140860
SN - 2399-3650
VL - 7
JO - Communications Physics
JF - Communications Physics
IS - 1
M1 - 354
ER -