AC Josephson effect between two superfluid time crystals

@article{Autti2020ACJE,
  title={AC Josephson effect between two superfluid time crystals},
  author={S. Autti and Pekka Heikkinen and Jere T. M{\"a}kinen and Grigory E. Volovik and V V Zavjalov and V. B. Eltsov},
  journal={Nature Materials},
  year={2020},
  pages={1-4}
}
Quantum time crystals are systems characterized by spontaneously emerging periodic order in the time domain 1 . While originally a phase of broken time translation symmetry was a mere speculation 2 , a wide range of time crystals has been reported 3 – 5 . However, the dynamics and interactions between such systems have not been investigated experimentally. Here we study two adjacent quantum time crystals realized by two magnon condensates in superfluid 3 He-B. We observe an exchange of magnons… 

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References

SHOWING 1-10 OF 47 REFERENCES

Observation of a Time Quasicrystal and Its Transition to a Superfluid Time Crystal.

We report experimental realization of a quantum time quasicrystal and its transformation to a quantum time crystal. We study Bose-Einstein condensation of magnons, associated with coherent spin

Classical discrete time crystals

The spontaneous breaking of time-translation symmetry in periodically driven quantum systems leads to a new phase of matter: the discrete time crystal (DTC). This phase exhibits collective

Discrete Time Crystals

Experimental advances have allowed for the exploration of nearly isolated quantum many-body systems whose coupling to an external bath is very weak. A particularly interesting class of such systems

Experimental observation of Josephson oscillations in a room-temperature Bose-Einstein magnon condensate

The alternating current (ac) Josephson effect in a time-independent spatially-inhomogeneous setting is manifested by the occurrence of Josephson oscillations - periodic macroscopic phase-induced

Josephson effect in fermionic superfluids across the BEC-BCS crossover

It is shown that the relative population and phase are canonically conjugate dynamical variables throughout the crossover from the molecular Bose-Einstein condensate (BEC) to the Bardeen-Cooper-Schrieffer (BCS) superfluid regime and the dynamics of the superfluids become dissipative, which is ascribed to the propagation of vortices through the superfluid bulk.

Magnon Bose–Einstein condensation and spin superfluidity

  • Y. BunkovG. Volovik
  • Physics
    Journal of physics. Condensed matter : an Institute of Physics journal
  • 2010
It is demonstrated that the coherent precession of magnetization is a true BEC of magnons, with theMagnon interaction term in the Gross-Pitaevskii equation being provided by spin-orbit coupling which is different for different states of the magnon BEC.

Tunable space-time crystal in room-temperature magnetodielectrics

We report the experimental realization of a space-time crystal with tunable periodicity in time and space in the magnon Bose-Einstein Condensate (BEC), formed in a room-temperature Yttrium Iron

Bogoliubov waves and distant transport of magnon condensate at room temperature

Experimentalally the condensed magnons forming compact humps of BEC density can propagate many hundreds of micrometers in the form of Bogoliubov waves, which advances the physics of quasiparticles and allows for the application of related transport phenomena for low-loss data transfer in magnon spintronics devices.

Josephson and persistent spin currents in Bose-Einstein condensates of magnons

Using the Aharonov-Casher (A-C) phase, we present a microscopic theory of the Josephson and persistent spin currents in quasiequilibrium Bose-Einstein condensates (BECs) of magnons in ferromagnetic

Relaxation of Bose-Einstein Condensates of Magnons in Magneto-Textural Traps in Superfluid 3He-B

In superfluid 3He-B externally pumped quantized spin-wave excitations or magnons spontaneously form a Bose-Einstein condensate in a 3-dimensional trap created with the order-parameter texture and a