Giant effective magnetic fields from optically driven chiral phonons in 4$f$ paramagnets

Abstract

We present a mechanism by which optically driven chiral phonon modes in rare-earth trihalides generate giant effective magnetic fields acting on the paramagnetic $4f$ spins. With cerium trichloride (CeCl${}_3$) as our example system, we calculate the coherent phonon dynamics in response to the excitation by an ultrashort terahertz pulse using a combination of phenomenological modeling and first-principles calculations. We find that effective magnetic fields of over 100 tesla can possibly be generated that polarize the spins for experimentally accessible pulse energies. The direction of induced magnetization can be reversed by changing the handedness of circular polarization of the laser pulse. The underlying process is a phonon analog of the inverse Faraday effect in optics that has been described recently, and which enables novel ways of achieving control over and switching of magnetic order at terahertz frequencies.

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• Chiral Phonons with Giant Magnetic Moments in a Topological Crystalline Insulator
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• Frequency splitting of chiral phonons from broken time reversal symmetry in CrI${}_3$
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• Vibrational dichroism of chiral valley phonons
• Adiabatic dynamics of coupled spins and phonons in magnetic insulators
• Chiral-phonon-induced current in helical crystals
• Phonon Inverse Faraday effect from electron-phonon coupling
• Strong transient magnetic fields induced by THz-driven plasmons in graphene disks
• Chiral phonons as dark matter detectors
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• Magnetic switching of phonon angular momentum in a ferrimagnetic insulator
• Light Driven Spontaneous Phonon Chirality and Magnetization in Paramagnets
• Theory of spin magnetization driven by chiral phonons
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• Extrinsic Mechanisms of Phonon Magnetic Moment
• Chiral phonons induced from spin dynamics via magnetoelastic anisotropy
• Terahertz high-harmonic generation in gapped antiferromagnetic chains
• Time-domain study of coupled collective excitations in quantum materials
• Phonon-driven multipolar dynamics in a spin-orbit coupled Mott insulator
• Heat Transport with a Twist
• Comprehensive Study of Phonon Chirality under Symmetry Constraints
• Terahertz metamaterials for light-driven magnetism
• Gauge theory of giant phonon magnetic moment in doped Dirac semimetals
• Chiral phonons in binary compounds $A$Bi ($A$ = K, Rb, Cs) with P2${}_1$/c structure
• Ultrafast simultaneous manipulation of multiple ferroic orders through nonlinear phonon excitation
• Emergent magnetism as a cooperative effect of interactions and reservoir
• Phonon Edelstein effect in chiral metals
• Symmetry-driven Phononic Metamaterials
• Terahertz Control of Linear and Nonlinear Magno-Phononics
• Ultrafast pseudomagnetic fields from electron-nuclear quantum geometry
• Spin-spin interaction mediated by chiral phonons
• Simple THz phase retarder based on Mach-Zehnder interferometer for polarization control
• Magnetic Signature of Chiral Phonons Revealed by Neutron Spectroscopy in Ferrimagnetic Fe${}_{1.75}$Zn${}_{0.25}$Mo${}_3$O${}_8$
• Catalogue of chiral phonon materials
• Chiral phonon in the cubic system based on the Laves phase of $A$Bi${}_2$ ($A=$K, Rb, Cs)
• Anomalous phonon magnetic moments
• Coupling of acoustic phonon to a spin-orbit entangled pseudospin
• Observation of angular momentum transfer among crystal lattice modes
• Inelastic Neutron Scattering for Direct Detection of Chiral Phonons
• Transient translation symmetry breaking via quartic-order negative light-phonon coupling at the Brillouin zone boundary in KTaO${}_3$
• General ab initio framework for electronic-order-induced lattice-dynamics symmetry breaking
• Dynamical Orbital Angular Momentum Induced by Circularly Polarized Phonons
• Supercurrent-induced phonon angular momentum
• Pseudo-chiral phonon splitting from octupolar magnetic order
• $SU(N)$ spin-phonon simulations of Floquet dynamics in spin $S>1/2$ Mott insulators