Nonreciprocal transport of a super-Ohmic quantum ratchet

Park, Takamori; Ishizuka, Hiroaki; Nagaosa, Naoto

doi:10.1103/physrevb.100.224301

Cited by 4 publications

(2 citation statements)

References 31 publications

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“…In contrast, we have demonstrated a Josephson phase engineering in dissipationless magnetic JJs. ϕ-phase JJs can serve as useful components for various superconducting quantum electronic devices, such as phase batteries that can be used to bias both classical and quantum circuits, superconducting-magnet hybrid memories and JJ-based quantum ratchets 28,[38][39][40] . The spin sensitivity of an Ising Josephson junction together with atomically thin magnetic tunneling barriers provides a route to the fabrication of novel superconducting and spintronic devices.…”

Section: Discussionmentioning

confidence: 99%

Unconventional supercurrent phase in Ising superconductor Josephson junction with atomically thin magnetic insulator

et al. 2021

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In two-dimensional (2D) NbSe2 crystal, which lacks inversion symmetry, strong spin-orbit coupling aligns the spins of Cooper pairs to the orbital valleys, forming Ising Cooper pairs (ICPs). The unusual spin texture of ICPs can be further modulated by introducing magnetic exchange. Here, we report unconventional supercurrent phase in van der Waals heterostructure Josephson junctions (JJs) that couples NbSe2 ICPs across an atomically thin magnetic insulator (MI) Cr2Ge2Te6. By constructing a superconducting quantum interference device (SQUID), we measure the phase of the transferred Cooper pairs in the MI JJ. We demonstrate a doubly degenerate nontrivial JJ phase (ϕ), formed by momentum-conserving tunneling of ICPs across magnetic domains in the barrier. The doubly degenerate ground states in MI JJs provide a two-level quantum system that can be utilized as a new dissipationless component for superconducting quantum devices. Our work boosts the study of various superconducting states with spin-orbit coupling, opening up an avenue to designing new superconducting phase-controlled quantum electronic devices.

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Section: Discussionmentioning

confidence: 99%

Unconventional supercurrent phase in Ising superconductor Josephson junction with atomically thin magnetic insulator

et al. 2021

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“…Besides, generally, the spectral density of the environment in the super-Ohmic regime ( ) reads as for . For instance can be found in 90 .…”

Section: Quantum Statistics: Nonclassical Features Eg Antibunching An...mentioning

confidence: 99%

Dissipative dynamics of optomagnonic nonclassical features via anti-Stokes optical pulses: squeezing, blockade, anti-correlation, and entanglement

Ghasemian

2023

Sci Rep

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We propose a feasible experimental model to investigate the generation and characterization of nonclassical states in a cavity optomagnonic system consisting of a ferromagnetic YIG sphere that simultaneously supports both the magnon mode and two whispering gallery modes of optical photons. The photons undergo the magnon-induced Brillouin light scattering, which is a well-established tool for the cavity-assisted manipulations of magnons as well as magnon spintronics. At first, we derive the desired interaction Hamiltonian under the influence of the anti-Stokes scattering process and then proceed to analyze the dynamical evolution of quantum statistics of photons and magnons as well as their intermodal entanglement. The results show that both photons and magnons generally acquire some nonclassical features, e.g., the strong antibunching and anti-correlation. Interestingly, the system may experience the perfect photon and magnon blockade phenomena, simultaneously. Besides, the nonclassical features may be protected against the unwanted environmental effects for a relatively long time, especially, in the weak driving field regime and when the system is initiated with a small number of particles. However, it should be noted that some fast quantum-classical transitions may occur in-between. Although the unwanted dissipative effects plague the nonclassical features, we show that this system can be adopted to prepare optomagnonic entangled states. The generation of entangled states depends on the initial state of the system and the interaction regime. The intermodal photon-magnon entanglement may be generated and pronounced, especially, if the system is initialized with low intensity even Schrödinger cat state in the strong coupling regime. The cavity-assisted manipulation of magnons is a unique and flexible mechanism that allows an interesting test bed for investigating the interdisciplinary contexts involving quantum optics and spintronics. Moreover, such a hybrid optomagnonic system may be used to design both on-demand single-photon and single-magnon sources and may find potential applications in quantum information processing.

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Recent progresses in two-dimensional Ising superconductivity

Huang

et al. 2021

Materials Today Physics

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Nonreciprocal transport of a super-Ohmic quantum ratchet

Cited by 4 publications

References 31 publications

Unconventional supercurrent phase in Ising superconductor Josephson junction with atomically thin magnetic insulator

Unconventional supercurrent phase in Ising superconductor Josephson junction with atomically thin magnetic insulator

Dissipative dynamics of optomagnonic nonclassical features via anti-Stokes optical pulses: squeezing, blockade, anti-correlation, and entanglement

Recent progresses in two-dimensional Ising superconductivity

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