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Chirality-induced phonon spin selectivity by elastic spin-orbit interaction.

Chenwen Yang¹, Jie Ren¹

¹Center for Phononics and Thermal Energy Science, China-EU Joint Lab on Nanophononics, Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China.

Proceedings of the National Academy of Sciences of the United States of America

|November 15, 2024

Summary

This summary is machine-generated.

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High-Throughput Estimation of Phonon Thermal Conductivity from First-Principles Calculations of Elasticity.

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This study reveals elastic spin-orbit interaction (SOI) in helical waveguides, demonstrating its impact on elastic waves and introducing Chirality-Induced Phonon Spin Selectivity for wave manipulation.

Area of Science:

Physics
Wave Mechanics
Materials Science

Background:

Spin and orbital degrees of freedom are fundamental in particle and classical wave physics.
Spin-orbit interaction (SOI) in optics enables wave manipulation.
The elastic counterpart of SOI in elastic waveguides remains largely unexplored.

Purpose of the Study:

To demonstrate the existence of elastic spin-orbit interaction (SOI) in helical waveguides.
To investigate the interplay of elastic spin angular momentum (SAM) and orbital angular momentum (OAM) under elastic SOI.
To explore the potential for novel wave manipulation strategies.

Main Methods:

Analytical theory development for elastic vibrations in helical waveguides.
Numerical simulations to analyze wave behavior.

Keywords:

elastic spin phonon spin spin–orbit interaction

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Investigation of synthetic gauge potentials induced by waveguide geometry.

Main Results:

Elastic SOI was demonstrated to exist in helical waveguides.
The interplay between elastic SAM, intrinsic OAM, and extrinsic OAM was unveiled, influenced by elastic SOI.
Chirality-Induced Phonon Spin Selectivity was observed due to elastic SOI.

Conclusions:

The findings establish the existence and impact of elastic SOI in waveguides.
This research advances the understanding of angular momentum physics in elastic waves.
The study provides practical strategies for manipulating elastic waves.