Nonequilibrium effects in a Josephson junction coupled to a precessing spin

Holmqvist, Cecilia; Teber, S.; Fogelström, Mikael

doi:10.1103/physrevb.83.104521

Cited by 29 publications

(59 citation statements)

References 86 publications

(158 reference statements)

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“…Furthermore, the dynamics of both JJs with misaligned ferromagnetic layers and those coupled to single or multiple ferromagnetic layers have also been studied numerically 31 . It has also been shown that the presence of a single classical spin of a molecular magnet precessing under the action of a constant magnetic field coupled to a JJ may lead to generation of finite spin current whose polarization axis rotates with same frequency as the classical spin 32 . Such theoretical studies were complemented by experimental work on these systems 33 .…”

Section: Pacs Numbersmentioning

confidence: 99%

Magnetization-induced dynamics of a Josephson junction coupled to a nanomagnet

et al. 2017

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We study the superconducting current of a Josephson junction (JJ) coupled to an external nanomagnet driven by a time dependent magnetic field both without and in the presence of an external AC drive. We provide an analytic, albeit perturbative, solution for the Landau-Lifshitz (LL) equations governing the coupled JJ-nanomagnet system in the presence of a magnetic field with arbitrary time-dependence oriented along the easy axis of the nanomagnet's magnetization and in the limit of weak dimensionless coupling 0 between the JJ and the nanomagnet. We show the existence of Shapiro-like steps in the I-V characteristics of the JJ subjected to a voltage bias for a constant or periodically varying magnetic field and explore the effect of rotation of the magnetic field and the presence of an external AC drive on these steps. We support our analytic results with exact numerical solution of the LL equations. We also extend our results to dissipative nanomagnets by providing a perturbative solution to the Landau-Lifshitz-Gilbert (LLG) equations for weak dissipation. We study the fate of magnetization-induced Shapiro steps in the presence of dissipation both from our analytical results and via numerical solution of the coupled LLG equations. We discuss experiments which can test our theory.

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Section: Pacs Numbersmentioning

confidence: 99%

Magnetization-induced dynamics of a Josephson junction coupled to a nanomagnet

et al. 2017

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“…[41]. More suitable approaches for current calculation lead to singularities instead of divergences [28,29]. These singularities are consequence of the singular BCS density of states at the gap edges and are signatures for contribution of an infinite number of extended states in the current.…”

Section: Resultsmentioning

confidence: 99%

“…In Refs. [29,30] it has been shown that when the nanomagnet undergoes a precession due to an external magnetic filed the Andreev levels are affected by the dynamics of the nanomagnet's spin. The resultant Andreev levels depend on the tilt angle and precession frequency.…”

Section: Resultsmentioning

confidence: 99%

“…This effect may be used in the single spin detection. It has been shown that a spin current is generated in the superconducting leads by spin nutation of the molecular nanomagnet [28,29,30,31]. The spin current induces a torque on the spin and changes its dynamics.…”

Section: Discussionmentioning

confidence: 99%

“…The dynamics of the Andreev bound states and their effects on the current flowing through the junction have also been studied in Refs. [29,30,31].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spin nutation effects in molecular nanomagnet–superconductor tunnel junctions

Abouie¹,

Abdollahipour²,

Rostami³

2013

J. Phys.: Condens. Matter

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Abstract. We study the spin nutation effects of the molecular nanomagnet on the Josephson current through a superconductor|molecular nanomagnet|superconductor tunnel junction. We explicitly demonstrate that due to the spin nutation of the molecular nanomagnet two oscillatory terms emerge in the ac Josephson current in addition to the conventional ac Josephson current. Some resonances occur in the junction due to the interactions of the transported quasiparticles with the bias voltage and molecular nanomagnet spin dynamics. The appearance of them indicate that the energy exchanged during these interactions is in the range of the superconducting energy gap. We also show that the spin nutation is able to convert the ac Josephson current to a dc one which is interesting for applications.PACS numbers: 74.50.+r, 75.50.Xx, 75.78.-n ‡ These authors have contributed equally to this work.

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Superconductor/Ferromagnet Heterostructures: A Platform for Superconducting Spintronics and Quantum Computation

2022

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The interplay between superconductivity and ferromagnetism in the superconductor/ferromagnet (SC/FM) heterostructures generates many interesting physical phenomena, including spin-triplet superconductivity, superconducting order parameter oscillation, and topological superconductivity. The unique physical properties make the SC/FM heterostructures as promising platforms for future superconducting spintronics and quantum computation applications. In this article, we review important research progress of SC/FM heterostructures from superconducting spintronics to quantum computation, and it is organized as follows. Firstly, we discuss the progress of spin current carriers in SC/FM heterostructures including Bogoliubov quasiparticles, superconducting vortex, and spin-triplet Cooper pairs which might be used for long-range spin transport. Then, we will describe the π Josephson junctions and its application for constructing π qubits. Finally, we will briefly review experimental signatures of Majorana states in the SC/FM heterostructures and the theoretically proposed manipulation, which could be useful to realize fault-tolerant topological quantum computing.

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Nonequilibrium effects in a Josephson junction coupled to a precessing spin

Cited by 29 publications

References 86 publications

Magnetization-induced dynamics of a Josephson junction coupled to a nanomagnet

Magnetization-induced dynamics of a Josephson junction coupled to a nanomagnet

Spin nutation effects in molecular nanomagnet–superconductor tunnel junctions

Superconductor/Ferromagnet Heterostructures: A Platform for Superconducting Spintronics and Quantum Computation

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