Related papers: Néel Spin-Orbit Torque in Antiferromagnetic Quantum Spin and Anomalous Hall Insulators

Néel Spin-Orbit Torque in Antiferromagnetic Quantum Spin and Anomalous Hall Insulators

URL: http://arxiv.org/abs/2410.21751v1
Date: Tue, 29 Oct 2024 05:36:56 GMT
Title: Néel Spin-Orbit Torque in Antiferromagnetic Quantum Spin and Anomalous Hall Insulators
Authors: Junyu Tang, Hantao Zhang, Ran Cheng,
Abstract summary: topological phases support a staggered Edelstein effect through which an applied electric field can generate opposite non-equilibrium spins on the two AFM sublattices. Our findings unravel an incredible way to exploit AFM topological phases to achieve ultrafast magnetic dynamics.
Score: 8.361642692363516
License:
Abstract: Interplay between magnetic ordering and topological electrons not only enables new topological phases but also underpins electrical control of magnetism. Here we extend the Kane-Mele model to include the exchange coupling to a collinear background antiferromagnetic (AFM) order, which can describe transition metal trichalcogenides. Owing to the spin-orbit coupling and staggered on-site potential, the system could exhibit the quantum anomalous Hall and quantum spin Hall effects in the absence of a net magnetization. Besides the chiral edge states, these topological phases support a staggered Edelstein effect through which an applied electric field can generate opposite non-equilibrium spins on the two AFM sublattices, realizing the N\'eel-type spin-orbit torque (NSOT). Contrary to known NSOTs in AFM metals driven by conduction currents, our NSOT arises from pure adiabatic currents devoid of Joule heating, while being a bulk effect not carried by the edge currents. By virtue of the NSOT, the electric field of a microwave can drive the AFM dynamics with a remarkably high efficiency. Compared to the ordinary AFM resonance driven by the magnetic field, the new mechanism can enhance the resonance amplitude by more than one order of magnitude and the absorption rate of the microwave power by over two orders of magnitude. Our findings unravel an incredible way to exploit AFM topological phases to achieve ultrafast magnetic dynamics.

Related papers

Strong photon coupling to high-frequency antiferromagnetic magnons via topological surface states [0.0]
We show strong coupling between antiferromagnetic magnons and microwave cavity photons at both high and externally controllable magnon frequencies. This result may advance the utilization of high-frequency cavity magn frequencies and enable its incorporation into quantum information technology.
arXiv Detail & Related papers (2024-10-18T18:00:08Z)
Nonlinear Superconducting Magnetoelectric Effect [0.30723404270319693]
A supercurrent flow can induce a nonvanishing spin magnetization in noncentrosymmetric superconductors with spin-orbit interaction. Here, we argue that a nonlinear superconducting magnetoelectric effect can naturally manifest in altermagnet/superconductor (ALM/SC) heterostructures. Strikingly, we find NSM is the leading order magnetization response in ALM/SC heterostructures and survives even in the presence of centrosymmetry.
arXiv Detail & Related papers (2024-04-29T11:39:59Z)
Cavity magnonics with domain walls in insulating ferromagnetic wires [0.0]
Magnetic domain walls (DWs) are topological defects that exhibit robust low-energy modes that can be harnessed for classical and neuromorphic computing. We show how to exploit a geometric Berry-phase interaction between the localized DWs and the extended magnons in short ferromagnetic insulating wires. We demonstrate that magnons can mediate long-range entangling interactions between qubits stored in distant DWs, which could facilitate the implementation of a universal set of quantum gates.
arXiv Detail & Related papers (2024-01-06T08:46:26Z)
Electron-mediated entanglement of two distant macroscopic ferromagnets within a nonequilibrium spintronic device [0.8030359871216614]
We demonstrate that a current pulse can be harnessed to entangle quantum localized spins of two spatially separated spacersmagnets (FMs) We quantify the mixed-state entanglement generated between the FM layers by tracking the time-evolution of the full density matrix and analyzing the build-up of the mutual logarithmic negativity over time. We propose a current-pump/X-ray-probe'' scheme, utilizing ultrafast X-ray spectroscopy, that can witness nonequilibrium and transient entanglement of the FM layers.
arXiv Detail & Related papers (2022-10-13T00:04:57Z)
Measuring the magnon-photon coupling in shaped ferromagnets: tuning of the resonance frequency [50.591267188664666]
cavity photons and ferromagnetic spins excitations can exchange information coherently in hybrid architectures. Speed enhancement is usually achieved by optimizing the geometry of the electromagnetic cavity. We show that the geometry of the ferromagnet plays also an important role, by setting the fundamental frequency of the magnonic resonator.
arXiv Detail & Related papers (2022-07-08T11:28:31Z)
Voltage-driven exchange resonance achieving 100\% mechanical efficiency [5.058288996011671]
We propose an alternative mechanism, voltage-induced torque, to realize high efficiency in generating high-frequency magnetization dynamics. Because the output current is purely adiabatic while dissipative current vanishes identically, the proposed voltage-driven exchange resonance entails a remarkably high mechanical efficiency close to unity.
arXiv Detail & Related papers (2022-04-04T17:45:20Z)
Demonstration of electron-nuclear decoupling at a spin clock transition [54.088309058031705]
Clock transitions protect molecular spin qubits from magnetic noise. linear coupling to nuclear degrees of freedom causes a modulation and decay of electronic coherence. An absence of quantum information leakage to the nuclear bath provides opportunities to characterize other decoherence sources.
arXiv Detail & Related papers (2021-06-09T16:23:47Z)
Photon Condensation and Enhanced Magnetism in Cavity QED [68.8204255655161]
A system of magnetic molecules coupled to microwave cavities undergoes the equilibrium superradiant phase transition. The effect of the coupling is first illustrated by the vacuum-induced ferromagnetic order in a quantum Ising model. A transmission experiment is shown to resolve the transition, measuring the quantum electrodynamical control of magnetism.
arXiv Detail & Related papers (2020-11-07T11:18:24Z)
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)
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)
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.