Effective magnetic fields induced by chiral phonons

Xiong, Guohuan; Chen, Hao; Ma, Dengke

doi:10.1103/physrevb.106.144302

Cited by 19 publications

(7 citation statements)

References 52 publications

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“…Among the possible symmetries, mirror symmetries play a special role: When they are broken, the lattice ions can display circular motion with finite angular momentum (2). These modes are called chiral phonons, and recently, they have been the subject of intense research in a large variety of materials and applications (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16). In magnetic fields, chiral phonons preferably absorb polarized light of a given handedness, resulting in magnetic circular dichroism (MCD) (17)(18)(19).…”

Section: Introductionmentioning

confidence: 99%

Observation of interplay between phonon chirality and electronic band topology

Hernandez,

Baydin,

Chaudhary

et al. 2023

Sci. Adv.

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The recently demonstrated chiral modes of lattice motion carry angular momentum and therefore directly couple to magnetic fields. Notably, their magnetic moments are predicted to be strongly influenced by electronic contributions. Here, we have studied the magnetic response of transverse optical phonons in a set of Pb1−xSnxTe films, which is a topological crystalline insulator forx> 0.32 and has a ferroelectric transition at anx-dependent critical temperature. Polarization-dependent terahertz magnetospectroscopy measurements revealed Zeeman splittings and diamagnetic shifts, demonstrating a large phonon magnetic moment. Films in the topological phase exhibited phonon magnetic moment values that were larger than those in the topologically trivial samples by two orders of magnitude. Furthermore, the sign of the effective phonong-factor was opposite in the two phases, a signature of the topological transition according to our model. These results strongly indicate the existence of interplay between the magnetic properties of chiral phonons and the topology of the electronic band structure.

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Section: Introductionmentioning

confidence: 99%

Observation of interplay between phonon chirality and electronic band topology

Hernandez,

Baydin,

Chaudhary

et al. 2023

Sci. Adv.

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“…Chiral phonons, which are collective oscillations of a crystal lattice, exhibit a definitive handedness, setting them apart from traditional textbook examples that correspond to achiral modes. − Although the non-zero total pseudoangular momentum (PAM) is enabled by inversion symmetry breaking in two-dimensional materials, the chiral motion of sublattices is present, even preserving this symmetry. The burgeoning interest in this collective chiral motion of the atoms has positioned them at the epicenter of an incipient but expanding research frontier. − Given the long history of remarkable effects arising due to electron–phonon interactions, − a natural question is whether the chirality of phonons may impart remarkable effects on electrons via their interaction. Previous studies have suggested that the interaction with one zone boundary mode with chiral displacement of the atoms can induce co-propagating edge states and that chiral phonons may incite unconventional and high-temperature superconductivity …”

Section: Introductionmentioning

confidence: 99%

Entangled States Induced by Electron–Phonon Interaction in Two-Dimensional Materials

Mella,

Calvo,

Foa Torres

2023

Nano Lett.

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“…Phononic TRS breaking is a correction to the standard Born-Oppenheimer approximation, which assumes frozen lattices and preserves TRS in solving electronic states. Such correction has been theoretically demonstrated by considering the ionic current (13,14), electronic Berry phase accumulation (15)(16)(17)(18), and nonadiabatic dynamics (19).…”

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confidence: 98%

Large effective magnetic fields from chiral phonons in rare-earth halides

Luo,

Lin,

Zhang

et al. 2023

Science

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Time-reversal symmetry (TRS) is pivotal for materials’ optical, magnetic, topological, and transport properties. Chiral phonons, characterized by atoms rotating unidirectionally around their equilibrium positions, generate dynamic lattice structures that break TRS. Here, we report that coherent chiral phonons, driven by circularly polarized terahertz light pulses, polarize the paramagnetic spins in cerium fluoride in a manner similar to that of a quasi-static magnetic field on the order of 1 tesla. Through time-resolved Faraday rotation and Kerr ellipticity, we found that the transient magnetization is only excited by pulses resonant with phonons, proportional to the angular momentum of the phonons, and growing with magnetic susceptibility at cryogenic temperatures. The observation quantitatively agrees with our spin-phonon coupling model and may enable new routes to investigating ultrafast magnetism, energy-efficient spintronics, and nonequilibrium phases of matter with broken TRS.

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Effective magnetic fields induced by chiral phonons

Cited by 19 publications

References 52 publications

Observation of interplay between phonon chirality and electronic band topology

Observation of interplay between phonon chirality and electronic band topology

Entangled States Induced by Electron–Phonon Interaction in Two-Dimensional Materials

Large effective magnetic fields from chiral phonons in rare-earth halides

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