Quantum many-body dynamics of the Einstein-de Haas effect

Abstract

In 1915, Einstein and de Haas and Barnett demonstrated that changing the magnetization of a magnetic material results in mechanical rotation, and vice versa. At the microscopic level, this effect governs the transfer between electron spin and orbital angular momentum, and lattice degrees of freedom, understanding which is key for molecular magnets, nano-magneto-mechanics, spintronics, and ultrafast magnetism. Until now, the timescales of electron-to-lattice angular momentum transfer remain unclear, since modeling this process on a microscopic level requires addition of an infinite amount of quantum angular momenta. We show that this problem can be solved by reformulating it in terms of the recently discovered angulon quasiparticles, which results in a rotationally invariant quantum many-body theory. In particular, we demonstrate that non-perturbative effects take place even if the electron--phonon coupling is weak and give rise to angular momentum transfer on femtosecond timescales.

15 pages, 5 figures

References in corpus (11)

• Strong electronic correlations from Hund's coupling
• The Ultrafast Einstein-De Haas Effect
• Normal state of highly polarized Fermi gases: Full many-body treatment
• Effects of mechanical rotation on spin currents
• Rotation of quantum impurities in the presence of a many-body environment
• THz-driven ultrafast spin-lattice scattering in amorphous metallic ferromagnets
• Quasiparticle approach to molecules interacting with quantum solvents
• Magnetomechanical coupling and ferromagnetic resonance in magnetic nanoparticles
• Structural dynamics during laser induced ultrafast demagnetization
• Diagrammatic Monte Carlo approach to angular momentum in quantum many-particle systems
• Molecular impurities interacting with a many-particle environment: from helium droplets to ultracold gases

Cited by in corpus (27)

• The Ultrafast Einstein-De Haas Effect
• Orbital magnetic moments of phonons
• Terahertz electric-field driven dynamical multiferroicity in SrTiO${}_3$
• Phono-magnetic analogs to opto-magnetic effects
• Chiral Phonon Induced Spin-Polarization
• Angular Momentum Conservation and Phonon Spin in Magnetic Insulators
• Difference between angular momentum and pseudoangular momentum
• Frequency splitting of chiral phonons from broken time reversal symmetry in CrI${}_3$
• Magnetoelastic hybrid excitations in CeAuAl${}_3$
• Phonon Transport Controlled by Ferromagnetic Resonance
• Orbital Pumping Incorporating Both Orbital Angular Momentum and Position
• Angular momentum transfer via relativistic spin-lattice coupling from first principles
• Topological magnons on the triangular kagome lattice
• Rotationally invariant formulation of spin-lattice coupling in multi-scale modeling
• Spin-lattice interaction parameters from first principles: theory and implementation
• Chiral phonons induced from spin dynamics via magnetoelastic anisotropy
• Type-II Dirac points and Dirac nodal loops on the magnons of square-hexagon-octagon lattice
• Einstein-de Haas Effect of Topological Magnons
• Calculating spin-lattice interactions in ferro- and antiferromagnets: the role of symmetry, dimension and frustration
• Conservation of Angular Momentum in the Elastic Medium with Spins
• Vibrational angular momentum level densities of linear molecules
• Variational theory of angulons and their rotational spectroscopy
• Phonon helicity and Nieh-Yan Anomaly in the Kramers-Weyl semimetals of Chiral Crystals
• Spin-lattice couplings in $3d$ ferromagnets: analysis from first-principles
• Einstein-de Haas effect: a bridge linking mechanics, magnetism, and topology
• Environment-limited transfer of angular momentum in Bose liquids
• Torque-free manipulation of nanoparticle rotations via embedded spins