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Updated: Sep 13, 2025

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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Published on: June 28, 2018

Phonon-Driven Multipolar Dynamics in a Spin-Orbit Coupled Mott Insulator.

Kathleen Hart¹, Ruairidh Sutcliffe¹, Gil Refael^2,3

¹University of Toronto, Department of Physics, 60 Saint George Street, Toronto, Ontario M5S 1A7, Canada.

Physical Review Letters

|July 31, 2025

Summary

Driven phonons can control hidden multipole orders in Mott insulators. This research explores exciting phonon modes to manipulate quadrupolar and octupolar moments, offering new avenues for solid-state control.

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Area of Science:

Condensed Matter Physics
Quantum Materials
Light-Matter Interactions

Background:

Mott insulators can host complex multipole orders beyond simple magnetism.
Advances in pump-probe experiments enable studying light-driven phenomena in solids.

Purpose of the Study:

To theoretically investigate the impact of pumped and driven phonons on multipole moments in Mott insulators.
To explore how specific phonon modes can control quadrupolar and octupolar orders.

Main Methods:

Utilizing a Monte Carlo code with phonon incorporation.
Employing molecular dynamics simulations for coupled spin-phonon equations.
Applying analytical Floquet theory for driven phenomena.

Main Results:

Resonant excitation of E_{g} phonon modes induces multipolar precession.
Backaction leads to pseudochiral phonon dynamics in the octupolar phase.
Two-phonon drives can build up or switch octupolar order on picosecond timescales.

Conclusions:

Driven phonons offer a powerful tool to probe and control hidden orders in solids.
This work extends beyond conventional dipolar magnetism to multipole dynamics.