0–
                    <i>π</i>
                    transition induced by the barrier strength in spin superconductor Josephson junctions

Zeng, W.; Shen, R.

doi:10.1088/1674-1056/27/9/097401

Cited by 5 publications

(5 citation statements)

References 36 publications

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“…In contrast to the internode BCS pairing, the condensation in the FFLO case occurs in each Weyl cone independently. Therefore, the Andreev bound energies for the two Weyl nodes are different, which are written as (27) with…”

Section: Andreev Bound Statementioning

confidence: 99%

“…[17,20] Josephson current can be an effective method to probe the superconducting pairing mechanism. [21][22][23][24][25][26][27][28][29][30][31] Recently, there are several works focus on the Josephson effect and superconducting pairing mechanisms based on Weyl semimetal supercon-ductor heterostructures. The influence of the chiral anomaly induced chiral charge imbalance on the Josephson current in a Weyl superconductor-Weyl semimetal-Weyl superconductor junction has been theoretically studied.…”

Section: Introductionmentioning

confidence: 99%

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Josephson current in an irradiated Weyl semimetal junction*

Wang¹,

Shen²

2021

Chinese Phys. B

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The influence of the off-resonant circularly polarized light on the Josephson current in the time-reversal broken superconducting Weyl semimetal junctions is investigated by using the Bogoliubov–de Gennes equation and the transfer matrix approach. Both the zero momentum BCS pairing states and the finite momentum Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) pairing states are considered for the Weyl superconductors. When a circularly polarized light is applied, it is shown that the current phase relation remains unchanged for the BCS pairing with the increasing of incident radiation intensity A 0. For FFLO pairing, the Josephson current exhibits the 0–π transition and periodic oscillation as a function of A 0. The dependence of free energy and critical current on A 0 are also investigated.

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Section: Andreev Bound Statementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Josephson current in an irradiated Weyl semimetal junction*

Wang¹,

Shen²

2021

Chinese Phys. B

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“…The spin Josephson effect occurs when two spin superconductors are weakly coupled by a normal metal [1,44]. The repeated spin-flipped Andreev-like reflections at the NS interfaces lead to the Andreev-like bound states, which are responsible for the dissipationless spin supercurrent.…”

Section: Introductionmentioning

confidence: 99%

Anomalous spin Josephson effect in ferromagnetic graphene with spin superconductivity

Zeng¹,

Shen²

2023

Preprint

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We theoretically investigate the spin Josephson effect in spin superconductors based on the ferromagnetic graphene with noncollinear magnetic configurations. For the Josephson junctions with out-of-plane magnetization, the possible π-state spin supercurrent can be generated due to the Fermi momentum-splitting Andreev-like reflections at the normal metal/spin superconductor interfaces. For the Josephson junctions with in-plane magnetization, the anomalous spin supercurrent appears and is driven by the misorientation angle of the in-plane magnetization. The symmetry analysis shows that the appearance of the anomalous spin Josephson current is possible when the combined symmetry of the spin rotation and the time reversal is broken.

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“…When a ferromagnetic middle layer with large exchanging interactions is inserted between superconducting electrodes, the π junction forms with I = I c sin(ϕ + π). [6][7][8][9][10][11] In addition, the anomalous Josephson junction can carry supercurrent even if there is no superconducting phase difference between two leads, that is, I = I c sin(ϕ + δ ), also named as the δ junction. [12][13][14][15] This anomalous junction could not only be a natural phase shifter or a phase battery in the superconducting circuits but also be crucial for the superconducting quantum computation.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Josephson current in quantum anomalous Hall insulator-based superconducting junctions with a domain wall structure*

2020

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We theoretically study the Josephson effect in a quantum anomalous Hall insulator (QAHI) nanoribbon with a domain wall structure and covered by the superconductor. The anomalous Josephson current, the nonzero supercurrent at the zero superconducting phase difference, appears with the nonzero magnetization and the suitable azimuth angle of the domain wall. Dependent on the configuration of the domain wall, the anomalous current peaks in the Bloch type but disappears in the Néel type because the y-component of magnetization is necessary to break symmetry to arouse the anomalous current. The phase shift of the anomalous current is tunable by the magnetization, the azimuth angle, or the thickness of the domain wall. By introducing a bare QAHI region in the middle of the junction which is not covered by the superconductor, the anomalous Josephson effect is enhanced such that the phase shift can exceed π. Thus, a continuous change between 0 and π junctions is realized via regulating the configuration of the domain wall or the magnetization strength. As long as an s-wave superconductor is placed on the top of the QAHI with a domain wall structure, this proposal can be experimentally fabricated and useful for the phase battery or superconducting quantum bit.

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0– π transition induced by the barrier strength in spin superconductor Josephson junctions

Cited by 5 publications

References 36 publications

Josephson current in an irradiated Weyl semimetal junction*

Josephson current in an irradiated Weyl semimetal junction*

Anomalous spin Josephson effect in ferromagnetic graphene with spin superconductivity

Anomalous Josephson current in quantum anomalous Hall insulator-based superconducting junctions with a domain wall structure*

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