Ultrafast coherent magnon spin currents in antiferromagnets

• URL: http://arxiv.org/abs/2507.18563v1
• Date: Thu, 24 Jul 2025 16:37:17 GMT
• Title: Ultrafast coherent magnon spin currents in antiferromagnets
• Abstract summary: Generating coherent magnon spin currents with the highest frequencies and shortest wavelengths is a key challenge in ultrafast spintronics and magnonics.<n>We show that a coherent superposition of multiple magnon-pair modes can produce a current in parity-time symmetric antiferromagnets.<n>The ultrafast coherent spin currents are excited with linearly polarized light, with the light polarization steering the current direction.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Generating coherent magnon spin currents with the highest frequencies and shortest wavelengths is a key challenge in ultrafast spintronics and magnonics. A promising route is to excite counter-propagating magnon pairs. In antiferromagnets, such pairs can be accessed in the ultrafast regime, where coherent dynamics are dominated by magnons at the edge of the Brillouin zone. However, it has seemed impossible to generate a net spin current from coherent magnon pairs. Here we show that a coherent superposition of multiple magnon-pair modes can produce such a current in parity-time symmetric antiferromagnets. The ultrafast coherent spin currents are excited with linearly polarized light, with the light polarization steering the current direction. Finally, by superposing two orthogonal spin currents, circular spin currents can be generated, which have not been discussed for steady-state currents.

Related papers

• All optical ultrafast pure spin current in the altermagnet Cr$_2$SO [0.0]
  We show that infra-red valley excitation combined with a THz pulse envelope allows the generation of large and nearly 100% pure spin currents.<n>Results thus provide a practical and all-optical route to the generation of pure spin current in $d$-wave 2d altermagnets.
  arXiv  Detail & Related papers  (2026-04-14T14:48:12Z)
• Persistent Charge and Spin Currents in a Ferromagnetic Hatano-Nelson Ring [0.0]
  We investigate persistent charge and spin currents in a ferromagnetic Hatano-Nelson ring with anti-Hermitian intradimer hopping.<n>Non-reciprocal hopping generates a synthetic magnetic flux and drives a non-Hermitian Aharonov-Bohm effect.
  arXiv  Detail & Related papers  (2025-09-07T15:45:40Z)
• Strong spin-magnon coupling in a van der Waals magnet with tunable chiral symmetry [0.0]
  We show strong and tunable spin-magnon coupling between molecular spin qubits and magnons in a van der Waals antiferromagnetic insulator.<n>Our results establish magnonic cavities as a platform for scalable chiral quantum optics with magnetic materials.
  arXiv  Detail & Related papers  (2025-08-25T10:54:52Z)
• Unconventional magnetism mediated by spin-phonon-photon coupling [0.0]
  We predict a biquadratic long-range interaction between spins mediated by their coupling to phonons hybridized with vacuum photons into polaritons. The resulting ordered state is reminiscent of superconductivity mediated by the exchange of virtual phonons.
  arXiv  Detail & Related papers  (2024-05-15T10:58:03Z)
• Kerr nonlinearity induced strong spin-magnon coupling [0.0]
  Kerr-enhanced spin-magnon coupling invalidates the widely used single-Kittel-mode approximation to magnons. It is revealed that the spin decoherence induced by the multimode magnons in the strong-coupling regime becomes not severe, but suppressed.
  arXiv  Detail & Related papers  (2023-08-11T04:15:39Z)
• Quantum interference induced magnon blockade and antibunching in a hybrid quantum system [0.0]
  We study the phenomena of quantum interference assisted magnon blockade and magnon antibunching in a weakly interacting hybrid ferromagnet-superconductor system. The magnon excitations in two yttrium iron garnet spheres are indirectly coupled to a superconducting qubit through microwave cavity modes of two mutually perpendicular cavities.
  arXiv  Detail & Related papers  (2023-05-15T08:40:50Z)
• Resolving Fock states near the Kerr-free point of a superconducting resonator [51.03394077656548]
  We have designed a tunable nonlinear resonator terminated by a SNAIL (Superconducting Asymmetric Inductive eLement) We have excited photons near this Kerr-free point and characterized the device using a transmon qubit.
  arXiv  Detail & Related papers  (2022-10-18T09:55:58Z)
• Quantum amplification of spin currents in cavity magnonics by a parametric drive induced long-lived mode [0.0]
  Cavity-mediated magnon-magnon coupling can lead to a transfer of spin-wave excitations between two spatially separated magnetic samples. We show how the application of a two-photon parametric drive to the cavity can lead to stark amplification in this transfer efficiency.
  arXiv  Detail & Related papers  (2022-10-12T03:28:14Z)
• Quantum control of nuclear spin qubits in a rapidly rotating diamond [62.997667081978825]
  Nuclear spins in certain solids couple weakly to their environment, making them attractive candidates for quantum information processing and inertial sensing. We demonstrate optical nuclear spin polarization and rapid quantum control of nuclear spins in a diamond physically rotating at $1,$kHz, faster than the nuclear spin coherence time. Our work liberates a previously inaccessible degree of freedom of the NV nuclear spin, unlocking new approaches to quantum control and rotation sensing.
  arXiv  Detail & Related papers  (2021-07-27T03:39:36Z)
• Quantum coherent spin-electric control in a molecular nanomagnet at clock transitions [57.50861918173065]
  Electrical control of spins at the nanoscale offers architectural advantages in spintronics. Recent demonstrations of electric-field (E-field) sensitivities in molecular spin materials are tantalising. E-field sensitivities reported so far are rather weak, prompting the question of how to design molecules with stronger spin-electric couplings.
  arXiv  Detail & Related papers  (2020-05-03T09:27:31Z)
• Parallel dark soliton pair in a bistable 2D exciton-polariton superfluid [47.187609203210705]
  2D dark solitons are unstable and collapse into vortices due to snake instabilities. We demonstrate that a pair of dark solitons can be formed in the wake of an obstacle in a polariton flow resonantly supported by a homogeneous laser beam.
  arXiv  Detail & Related papers  (2020-03-25T13:52:22Z)
• Spin current generation and control in carbon nanotubes by combining rotation and magnetic field [78.72753218464803]
  We study the quantum dynamics of ballistic electrons in rotating carbon nanotubes in the presence of a uniform magnetic field. By suitably combining the applied magnetic field intensity and rotation speed, one can tune one of the currents to zero while keeping the other one finite, giving rise to a spin current generator.
  arXiv  Detail & Related papers  (2020-01-20T08:54:56Z)
• Temporal and spectral fingerprints of ultrafast all-coherent spin switching [0.0]
  terahertz pulses allow coherent navigation of spins over a potential barrier. Spin states can be selected by an external magnetic bias. Switchable spin states can be selected by an external magnetic bias.
  arXiv  Detail & Related papers  (2020-01-17T12:03:45Z)
• Optimal coupling of HoW$_{10}$ molecular magnets to superconducting circuits near spin clock transitions [85.83811987257297]
  We study the coupling of pure and magnetically diluted crystals of HoW$_10$ magnetic clusters to microwave superconducting coplanar waveguides. Results show that engineering spin-clock states of molecular systems offers a promising strategy to combine sizeable spin-photon interactions with a sufficient isolation from unwanted magnetic noise sources.
  arXiv  Detail & Related papers  (2019-11-18T11:03:06Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.