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Dynamical Orbital Angular Momentum Induced by Circularly Polarized Phonons
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Dynamical Orbital Angular Momentum Induced by Circularly Polarized Phonons
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We show that the orbital angular momentum (OAM) of electrons is dynamically induced by circularly polarized phonons. The induced OAM originates from the adiabatic evolution in which electrons acquire Berry phase formulated in terms of the Berry curvature encoded in phonon displacement space. By introducing a tight-binding model with $p$ orbitals on a honeycomb lattice, we show a microscopic picture that ionic rotations modulate orbital overlaps of electrons, and calculate the generated OAM, whose sign depends on phonon chirality. We then construct an effective model for valley phonons with different phonon pseudoangular momenta (PAM) and identity their distinct intervalley-scattering channels. Our model obeys the selection rule between phonons and electrons with the orbital degree of freedom. Extending this framework to $d$-orbital electrons, our model is applied to describe the induced OAM in monolayer transition metal dichalcogenides. Our results reveal a direct orbital generation mechanism that emerges even in materials with weak spin-orbital coupling, opening a new promising way for orbitronics applications.
Forward citations
Cited by 8 Pith papers
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Antiferro-Chiral Phonons in $\mathcal{P}\mathcal{T}$-Symmetric Antiferromagnets
PT-symmetric antiferromagnets support antiferro-chiral phonons whose sublattice-staggered angular momentum couples to the Neel vector via molecular Berry curvature.
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Antiferro-Chiral Phonons in $\mathcal{P}\mathcal{T}$-Symmetric Antiferromagnets
PT-symmetric antiferromagnets support antiferro-chiral phonons with sublattice-staggered angular momentum that acts as a conjugate field to the Néel vector via Néel-locked Raman-infrared hybridization.
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First-principles prediction of chiral-phonon-induced orbital accumulation
First-principles calculations predict that chiral lattice vibrations induce orbital accumulation in metals, controlled mainly by orbital character, near-degeneracies, and electron-phonon coupling.
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Angular momentum splitter effect of $d$-wave axial phonons in orbital altermagnets
d-wave axial phonons with an angular-momentum texture arise in orbital altermagnets via molecular Berry curvature, without spin-orbit coupling, enabling angular-momentum Seebeck and splitter effects.
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Magnetism and Topology from Circularly Polarized Phonon Floquet Engineering
Circularly polarized phonons on honeycomb lattice produce Haldane-type mass term via effective NNN hopping, driving transition to Chern insulator with emergent magnetizations.
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Effective electron coupling to phonon mechanical angular momentum in helical systems
Phonon mechanical angular momentum converts to electronic degrees of freedom via a derived second-order Hamiltonian in helical systems.
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Boundary condition for phonon distribution functions at a smooth crystal interface and interfacial angular momentum transfer
At a smooth crystal interface, total phonon angular momentum conservation forces circularly polarized phonons to shift sideways and generate orbital angular momentum, quantified here by new boundary conditions.
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Orbital Accumulation Induced by Chiral Phonons
In a p-orbital square-lattice model, chiral phonons induce a static orbital moment at second order in the lattice displacement via coupling to orbital quadrupoles.
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