Dynamical Josephson Effect Between a Singlet and a Triplet Superconductor
Pith reviewed 2026-06-28 12:05 UTC · model grok-4.3
The pith
A time-dependent gate voltage induces an oscillatory cos φ Josephson current between singlet and triplet superconductors that is absent when the voltage is static.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
Modeling a Josephson junction between a spin-singlet and a spin-triplet superconductor separated by a 2DEG shows that harmonic modulation of the gate voltage generates an oscillatory cos φ Josephson component through the time-dependent spin-orbit coupling; this component is forbidden and vanishes in the static limit. The total charge current then includes both dissipationless and dissipative parts, with the dissipative part strongly suppressed at low temperatures.
What carries the argument
Time-dependent gate-controlled spin-orbit coupling in the 2DEG, treated as a perturbation that changes the symmetry selection rules for the Josephson current.
If this is right
- A cos φ Josephson component appears under dynamic conditions even when singlet-triplet symmetry rules forbid it in equilibrium.
- The total charge current acquires both dissipationless and dissipative contributions under gate modulation.
- The dissipative contribution is strongly suppressed at low temperatures.
- The effect enables use of such junctions as sources of spin-triplet currents and as platforms for proximity effects.
- Dynamic control via gate voltage can be applied to qubit architectures that rely on Josephson junctions.
Where Pith is reading between the lines
- The same time-dependent perturbation approach may apply to other hybrid junctions where static symmetry forbids current flow.
- Experimental tests could focus on the temperature dependence of the dissipative component to isolate the dynamical contribution.
- If the modulation frequency can be tuned independently of decoherence rates, the effect might provide a new handle on phase coherence in hybrid devices.
Load-bearing premise
Gate-controlled spin-orbit coupling in the 2DEG can be modeled as a time-dependent perturbation that alters symmetry rules without introducing decoherence or heating that would eliminate the new current component.
What would settle it
Apply a harmonic gate-voltage modulation across the junction and check whether an oscillatory cos φ term appears in the measured current-phase relation but disappears when the modulation amplitude is set to zero.
Figures
read the original abstract
Phase-sensitive Josephson effect has long been central to identifying unconventional pairing symmetries in superconductors. Although the selection rules governing Josephson junctions (JJs) are generally determined by the symmetries of the constituent superconductors, we demonstrate that this paradigm is modified in the dynamic regime. By modeling a JJ where spin-singlet and spin-triplet superconductors are separated by a two-dimensional electron gas, we show that a time-dependent gate voltage qualitatively changes the underlying selection rules. This modification arises as a consequence of the gate-controlled spin-orbit coupling. A harmonic modulation of the gate voltage generates an oscillatory $\cos \phi$ Josephson component which vanishes in the static limit. The resulting charge current contains both dissipationless and dissipative components, with the latter strongly suppressed at low temperatures. This dynamical Josephson effect could transform the use of JJs in qubits, as sources of spin-triplet currents, and as platforms for proximity effects.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript models a Josephson junction between a spin-singlet and a spin-triplet superconductor separated by a 2DEG. It claims that harmonic modulation of a gate voltage, acting through time-dependent spin-orbit coupling, generates an oscillatory cos φ Josephson current component absent in the static limit. The total charge current contains both dissipationless and dissipative contributions, with the dissipative part strongly suppressed at low temperatures. This is presented as a consequence of modified symmetry selection rules under the dynamic perturbation.
Significance. If the central derivation holds, the result identifies a mechanism for dynamically altering Josephson selection rules without static symmetry breaking, which could enable new control protocols for superconducting qubits and triplet-current sources. The explicit vanishing of the cos φ term in the static limit and the low-temperature suppression of dissipation are falsifiable signatures that strengthen the claim.
major comments (2)
- [modeling section] The modeling section deriving the current from the time-dependent SOC Hamiltonian must explicitly demonstrate that the cos φ term arises only from the dynamic term and vanishes identically when the modulation amplitude is set to zero; without this step the central claim that the effect is absent in the static limit remains unverified.
- [modeling section] The treatment of the gate voltage as a clean time-dependent perturbation (no heating or decoherence channels) is load-bearing for the survival of the oscillatory component; the manuscript should quantify the frequency and amplitude regime where this approximation remains valid relative to the superconducting gap and relaxation rates.
minor comments (2)
- [abstract] The abstract states modeling results but supplies no equations or error estimates; a one-sentence summary of the Hamiltonian or the order of the perturbative treatment would improve accessibility.
- Notation for the phase difference φ and the modulation frequency should be defined at first use and kept consistent throughout the text and figures.
Simulated Author's Rebuttal
We thank the referee for the positive evaluation and the recommendation of minor revision. The two comments identify useful clarifications in the modeling section. We address each point below and will incorporate the requested additions in the revised manuscript.
read point-by-point responses
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Referee: [modeling section] The modeling section deriving the current from the time-dependent SOC Hamiltonian must explicitly demonstrate that the cos φ term arises only from the dynamic term and vanishes identically when the modulation amplitude is set to zero; without this step the central claim that the effect is absent in the static limit remains unverified.
Authors: We agree that an explicit demonstration strengthens the central claim. In the revised manuscript we will add a short subsection (or appendix paragraph) that takes the static limit by setting the modulation amplitude to zero and shows analytically that the cos φ component vanishes identically, recovering the known selection rules for the static singlet-triplet junction. revision: yes
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Referee: [modeling section] The treatment of the gate voltage as a clean time-dependent perturbation (no heating or decoherence channels) is load-bearing for the survival of the oscillatory component; the manuscript should quantify the frequency and amplitude regime where this approximation remains valid relative to the superconducting gap and relaxation rates.
Authors: We concur that the validity regime of the clean-perturbation approximation should be quantified. In the revision we will insert a paragraph that compares the modulation frequency and amplitude to the superconducting gap Δ and to typical quasiparticle relaxation rates in 2DEG systems, thereby delineating the parameter window in which the oscillatory cos φ term survives. revision: yes
Circularity Check
No significant circularity; derivation follows from time-dependent perturbation model
full rationale
The paper presents a model of a Josephson junction with time-dependent gate voltage modulating spin-orbit coupling between singlet and triplet superconductors. The oscillatory cos φ component is derived as a direct consequence of the dynamic term altering symmetry selection rules, explicitly vanishing in the static limit. No self-definitional steps, fitted inputs renamed as predictions, load-bearing self-citations, or ansatzes imported via prior work are present. The central claim is a modeled outcome of the time-dependent Hamiltonian without reduction to its own inputs by construction. This is the expected non-circular outcome for a theoretical proposal based on explicit perturbation modeling.
Axiom & Free-Parameter Ledger
Reference graph
Works this paper leans on
-
[1]
B. D. Josephson, Possible new effects in superconductive tunnelling, Phys. Lett.1, 251 (1962)
1962
-
[2]
Tafuri (ed.),Fundamentals and Frontiers of the Josephson Effect(Springer Nature, Cham, 2019)
F. Tafuri (ed.),Fundamentals and Frontiers of the Josephson Effect(Springer Nature, Cham, 2019)
2019
-
[3]
R. F. Voss and R. A. Webb, Macroscopic quantum tun- neling in 1−µm Nb Josephson junctions, Phys. Rev. Lett. 265, 47 (1981)
1981
-
[4]
M. H. Devoret, J. M. Martinis, and J. Clarke, Mea- surement of macroscopic quantum tunneling out of a zero-voltage state of a current-biased Josephson junction, Phys. Rev. Lett.55, 1908 (1985)
1908
-
[5]
Krantz, M
P. Krantz, M. Kjaergaard, F. Yan, T. P. Orlando, S. Gus- tavsson, and W. D. Oliver, A quantum engineer’s guide to superconducting qubits, Appl. Phys. Rev.6, 021318 (2019)
2019
-
[6]
H. Kim, G. Jang, S. Jin, D. Shin, H.-J. Shin, J. Luo, I. Siddiqi, Y. Kim, H. Hahn Yoon, and L. B. Nguyen, Josephson junctions in the age of quantum discovery, arXiv:2505.12724 (2025)
work page internal anchor Pith review Pith/arXiv arXiv 2025
-
[7]
ˇZuti´ c, J
I. ˇZuti´ c, J. Fabian, and S. Das Sarma, Spintronics: Fun- damentals and applications, Rev. Mod. Phys.76, 323 (2004)
2004
-
[8]
L. P. Gor’kov and E. I. Rashba, Superconducting 2D sys- tem with lifted spin degeneracy: Mixed singlet-triplet state, Phys. Rev. Lett.87, 037004 (2001)
2001
-
[9]
Linder and J
J. Linder and J. W. A. Robinson, Superconducting spin- tronics, Nat. Phys.11, 307 (2015)
2015
-
[10]
Amundsen, J
M. Amundsen, J. Linder, J. W. A. Robinson, I. ˇZuti´ c, and N. Banerjee, Colloquium: Spin-orbit effects in su- perconducting hybrid structures, Rev. Mod. Phys.96, 021003 (2024)
2024
-
[11]
Eschrig, Spin-polarized supercurrents for spintronics, Phys
M. Eschrig, Spin-polarized supercurrents for spintronics, Phys. Today64, 43 (2011)
2011
-
[12]
Martinez, P
I. Martinez, P. H¨ ogl, C. Gonz´ alez-Ruano, J. P. Cascales, C. Tiusan, Y. Lu, M. Hehn, A. Matos-Abiague, J. Fabian, I. ˇZuti´ c, and F. G. Aliev, Interfacial spin-orbit coupling: A platform for superconducting spintronics, Phys. Rev. Applied13, 014030 (2020)
2020
-
[13]
Nadeem, M
M. Nadeem, M. S. Fuhrer, and X. Wang, The supercon- ducting diode effect, Nat. Rev. Phys.5, 558 (2023)
2023
-
[14]
M. C. Dartiailh, W. Mayer, J. Yuan, K. S. Wickra- masinghe, A. Matos-Abiague, I. ˇZuti´ c, and J. Shabani, Phase signature of topological transition in Josephson junctions, Phys. Rev. Lett.126, 036802 (2021)
2021
-
[15]
H. Ren, F. Pientka, S. Hart, A. T. Pierce, M. Kosowsky, L. Lunczer, R. Schlereth, B. Scharf, E. M. Hankiewicz, L. W. Molenkamp, B. I. Halperin, and A. Yacoby, Topo- logical superconductivity in a phase-controlled Josephson junction, Nature569, 93 (2019)
2019
-
[16]
Fornieri, A
A. Fornieri, A. M. Whiticar, F. Setiawan, E. Por- tol´ es, A. C. C. Drachmann, A. Keselman, S. Gronin, C. Thomas, T. Wang, R. Kallaher, G. C. Gardner, E. Berg, M. J. Manfra, A. Stern, C. M. Marcus, and F. Nichele, Evidence of topological superconductivity in planar Josephson junctions, Nature569, 89 (2019)
2019
-
[17]
Das Sarma, M
S. Das Sarma, M. Freedman, and C. Nayak, Majorana zero modes and topological quantum computation, npj Quant. Inf.1, 150001 (2015)
2015
-
[18]
Flensberg, F
K. Flensberg, F. von Oppen, and A. Stern, Engineered platforms for topological superconductivity and Majo- rana zero modes, Nat. Rev. Mater.6, 944 (2021)
2021
-
[19]
T. Zhou, M. C. Dartiailh, K. Sardashti, J. E. Han, A. Matos-Abiague, J. Shabani, and I. ˇZuti´ c, Fusion of Majorana bound states with mini-gate control in two- dimensional systems, Nat. Commun.13, 1738 (2022)
2022
-
[20]
ˇZuti´ c, A
I. ˇZuti´ c, A. Matos-Abiague, B. Scharf, H. Dery, and 6 K. Belashchenko, Proximitized materials, Mater. Today 22, 85 (2019)
2019
-
[21]
A. I. Buzdin, Proximity effects in superconductor- ferromagnet heterostructures, Rev. Mod. Phys.77, 935 (2005)
2005
-
[22]
H. R. Ott, H. Rudigier, Z. Fisk, and J. L. Smith, UBe 13: An unconventional actinide superconductor, Phys. Rev. Lett.50, 1595 (1983)
1983
-
[23]
G. R. Stewart, Z. Fisk, J. O. Willis, and J. L. Smith, Pos- sibility of coexistence of bulk superconductivity and spin fluctuations in UPt 3, Phys. Rev. Lett.52, 679 (1984)
1984
-
[24]
S. S. Saxena, P. Agarwal, K. Ahilan, F. M. Grosche, R. K. W. Haselwimmer, M. J. Steiner, E. Pugh, I. R. Walker, S. R. Julian, P. Monthoux, G. G. Lonzarich, A. Huxley, I. Sheikin, D. Braithwaite, and J. Flouquet, Superconductivity on the border of itinerant-electron fer- romagnetism in UGe 2, Nature406, 587 (2000)
2000
-
[25]
S. Ran, C. Eckberg, Q.-P. Ding, Y. Furukawa, T. Metz, S. R. Saha, I.-L. Liu, M. Zic, H. Kim, J. Paglione, and N. P. Butch, Nearly ferromagnetic spin-triplet supercon- ductivity, Science365, 684 (2019)
2019
-
[26]
L. Jiao, S. Howard, S. Ran, Z. Wang, J. O. Rodriguez, M. Sigrist, Z. Wang, N. P. Butch, and V. Madhavan, Chiral superconductivity in heavy-fermion metal UTe 2, Nature579, 523 (2020)
2020
-
[27]
Kinjo, H
K. Kinjo, H. Fujibayashi, H. Matsumura, F. Hori, S. Kitagawa, K. Ishida, Y. Tokunaga, H. Sakai, S. Kambe, A. Nakamura, Y. Shimizu, Y. Homma, D. Li, F. Honda, and D. Aoki, Superconducting spin reorien- tation in spin-triplet multiple superconducting phases of UTe2, Science Advances9, eadg2736 (2023)
2023
-
[28]
H. Yoon, Y. S. Eo, J. Park, J. A. Horn, R. G. Dor- man, S. R. Saha, I. M. Hayes, I. Takeuchi, P. M. R. Brydon, and J. Paglione, Probingp-wave superconduc- tivity in UTe2 via point-contact junctions, npj Quantum Mater.9, 91 (2024)
2024
-
[29]
Z. Li, C. M. Moir, N. J. McKee, E. Lee-Wong, R. E. Baumbach, M. B. Maple, and Y. Liu, Observation of odd- parity superconductivity in UTe2, Proc. Natl. Acad. Sci. U.S.A.122(2025)
2025
-
[30]
L. V. Levitin, J. Knapp, P. Knappov´ a, M. Lucas, J. Ny´ eki, P. Heikkinen, V. Antonov, A. Casey, A. F. Ho, P. Coleman, C. Geibel, A. Steppke, K. Kliemt, C. Krell- ner, M. Brando, and J. Saunders, Odd-parity supercon- ductivity underpinned by antiferromagnetism in heavy fermion metal YbRh 2Si2, arXiv:2502.06420
-
[31]
J. A. Pals and W. van Haeringen, On the Josephson ef- fect between superconductors in singlet and triplet spin- pairing states, Physica B+C92, 360 (1977)
1977
-
[32]
heavy-fermion
V. B. Geshkenbein, A. I. Larkin, and A. Barone, Vor- tices with half magnetic flux quanta in “heavy-fermion” superconductors, Phys. Rev. B36, 235 (1987)
1987
-
[33]
K. D. Nelson, Z. Q. Mao, Y. Maeno, and Y. Liu, Odd- Parity Superconductivity in Sr2RuO4, Science306, 1151 (2004)
2004
-
[34]
ˇZuti´ c and I
I. ˇZuti´ c and I. Mazin, Phase-sensitive tests of the pairing state symmetry in Sr2RuO4, Phys. Rev. Lett.95, 217004 (2005)
2005
-
[35]
X. Xu, Y. Li, and C. L. Chien, Observation of odd-parity superconductivity with the Geshkenbein-Larkin-Barone composite rings, Phys. Rev. Lett.132, 056001 (2024)
2024
-
[36]
Yamaki and Y
K. Yamaki and Y. Asano, Singlet/triplet Josephson junc- tion on a substrate, Phys. Rev. B111, 214505 (2025)
2025
-
[37]
Linder and A
J. Linder and A. V. Balatsky, Odd-frequency supercon- ductivity, Rev. Mod. Phys.91, 045005 (2019)
2019
-
[38]
Triola and A
C. Triola and A. V. Balatsky, Odd-frequency supercon- ductivity in driven systems, Phys. Rev. B94, 094518 (2016)
2016
-
[39]
Triola and A
C. Triola and A. V. Balatsky, Pair symmetry conversion in driven multiband superconductors, Phys. Rev. B95, 224518 (2017)
2017
-
[40]
Cayao, C
J. Cayao, C. Triola, and A. M. Black-Schaffer, Floquet engineering bulk odd-frequency superconducting pairs, Phys. Rev. B103, 104505 (2021)
2021
-
[41]
Mayer, M
W. Mayer, M. C. Dartiailh, J. Yuan, K. S. Wickramas- inghe, E. Rossi, and J. Shabani, Gate controlled anoma- lous phase shift in Al/InAs Josephson junctions, Nat. Commun95, 212 (2020)
2020
-
[42]
Monroe, M
D. Monroe, M. Alidoust, and I. ˇZuti´ c, Tunable planar Josephson junctions driven by time-dependent spin-orbit coupling, Phys. Rev. Appl.18, L031001 (2022)
2022
-
[43]
Monroe, C
D. Monroe, C. Shen, D. Tringali, M. Alidoust, T. Zhou, and I. ˇZuti´ c, Phase jumps in Josephson junctions with time-dependent spin–orbit coupling, Appl. Phys. Lett. 125, 012601 (2024)
2024
-
[44]
S. J. Papadakis, E. P. De Poortere, H. C. Manoharan, M. Shayegan, and R. Winkler, The effect of spin splitting of a two-dimensional system, Science283, 2056 (1999)
2056
-
[45]
Van Tuan, B
D. Van Tuan, B. Scharf, Z. Wang, J. Shan, K. F. Mak, I. ˇZuti´ c, and H. Dery, Probing many-body interactions in monolayer transition-metal dichalcogenides, Phys. Rev. B99, 085301 (2019)
2019
-
[46]
Zhang, R
Y. Zhang, R. Polski, A. Thomson, E. Lantagne- Hurtubise, C. Lewandowski, H. Zhou, K. Watan- abe, T. Taniguchi, J. Alicea, and S. Nadj-Perge, En- hanced superconductivity in spin–orbit proximitized bi- layer graphene, Nature613, 268 (2023)
2023
-
[47]
G. D. Mahan,Many-Particle Physics, 3rd ed. (Springer, New York, NY, 2000)
2000
-
[48]
Abramowitz and I
M. Abramowitz and I. A. Stegun,Handbook of Mathe- matical Functions, illustrated ed. (Martino Fine Books, 2014)
2014
-
[49]
See Supplemental Material for a discussion of feasible material parameters, a detailed derivation of the current, and results for thes-wave–d-wave Josephson effect
-
[50]
A. M. Zagoskin,Quantum Theory of Many-Body Sys- tems, 2nd ed. (Springer, New York, NY, 2014)
2014
-
[51]
Ambegaokar and A
V. Ambegaokar and A. Baratoff, Tunneling Between Su- perconductors, Phys. Rev. Lett.10, 486 (1963)
1963
-
[52]
R. C. Dynes, V. Narayanamurti, and J. P. Garno, Di- rect measurement of quasiparticle-lifetime broadening in a strong-coupled superconductor, Phys. Rev. Lett.41, 1509 (1978)
1978
-
[53]
Zhang, W.-Y
X. Zhang, W.-Y. Shan, and D. Xiao, Optical selection rule of excitons in gapped chiral fermion systems, Phys. Rev. Lett.120, 077401 (2018)
2018
-
[54]
T. Cao, M. Wu, and S. G. Louie, Unifying optical selec- tion rules for excitons in two dimensions: Band topol- ogy and winding numbers, Phys. Rev. Lett.120, 087402 (2018)
2018
-
[55]
G. Xu, T. Zhou, B. Scharf, and I.ˇZuti´ c, Optically probing tunable band topology in atomic monolayers, Phys. Rev. Lett.125, 157402 (2020)
2020
- [56]
-
[57]
Scharf, F
B. Scharf, F. Pientka, H. Ren, A. Yacoby, and E. M. Han- 7 kiewicz, Tuning topological superconductivity in phase- controlled Josephson junctions with Rashba and Dressel- haus spin-orbit coupling, Phys. Rev. B99, 214503 (2019)
2019
-
[58]
Alidoust, C
M. Alidoust, C. Shen, and I. ˇZuti´ c, Cubic spin-orbit cou- pling and anomalous Josephson effect in planar junctions, Phys. Rev. B103, L060503 (2021)
2021
-
[59]
Y.-M. Xie, E. Lantagne-Hurtubise, A. F. Young, S. Nadj- Perge, and J. Alicea, Gate-defined topological Josephson junctions in bernal bilayer graphene, Phys. Rev. Lett. 131, 146601 (2023)
2023
-
[60]
Kontos, M
T. Kontos, M. Aprili, J. Lesueur, and X. Grison, Os- cillations of the superconducting order parameter in a ferromagnet, Phys. Rev. Lett.86, 304 (2001)
2001
-
[61]
Banerjee, J
N. Banerjee, J. W. A. Robinson, and M. G. Blamire, Reversible control of spin-polarised supercurrents in fer- romagnetic Josephson junctions, Nat. Commun.5, 4771 (2014)
2014
-
[62]
J. W. A. Robinson, N. Banerjee, and M. G. Blamire, Triplet pair correlations and nonmonotonic supercurrent decay with Cr thickness in Nb/Cr/Fe/Nb Josephson de- vices, Phys. Rev. B89, 104505 (2014)
2014
-
[63]
Singh, S
A. Singh, S. Voltan, K. Lahabi, and J. Aarts, Colossal proximity effect in a superconducting triplet spin valve based on the half-metallic ferromagnet CrO 2, Phys. Rev. X5, 021019 (2015)
2015
-
[64]
F. S. Bergeret, A. F. Volkov, and K. B. Efetov, Odd triplet superconductivity and related phenomena in superconductor-ferromagnet structures, Rev. Mod. Phys. 77, 1321 (2005)
2005
-
[65]
K.-R. Jeon, B. K. Hazra, J.-K. Kim, J.-C. Jeon, H. Han, H. L. Meyerheim, T. Kontos, A. Cottet, and S. S. P. Parkin, Chiral antiferromagnetic Josephson junctions as spin-triplet supercurrent spin valves and d.c. SQUIDs, Nat. Nanotechnol.18, 747 (2023)
2023
-
[66]
J. A. Ouassou, A. Brataas, and J. Linder, dc Joseph- son effect in altermagnets, Phys. Rev. Lett.131, 076003 (2023)
2023
- [67]
-
[68]
F. Amet, C. T. Ke, I. V. Borzenets, Y.-M. Wang, K. Watanabe, T. Taniguchi, R. S. Deacon, M. Ya- mamoto, Y. Bomze, S. Tarucha, and G. Finkelstein, Su- percurrent in the quantum Hall regime, Science352, 966 (2016)
2016
-
[69]
Gonz´ alez-Ruano, C
C. Gonz´ alez-Ruano, C. Shen, P. Tuero, C. Tiusan, Y. Lu, J. E. Han, I. ˇZuti´ c, and F. G. Aliev, Giant shot noise in superconductor/ferromagnet junctions with orbital- symmetry-controlled spin-orbit coupling, Nat. Commun. 16, 9524 (2025)
2025
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