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Related Experiment Video

Updated: Mar 9, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Frequency-division routing via spin-refractive-index locking.

Yuan-Peng Peng¹, Shi-Yao Zhu^1,2,3, J Q You^4,5

¹Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control, State Key Laboratory for Extreme Photonics and Instrumentation, School of Physics, Zhejiang University, Hangzhou, China.

Nature Communications

|March 7, 2026

Summary

This summary is machine-generated.

We discovered spin-refractive-index locking (SRIL) in metamaterials, controlling spin based on refractive index. This enables frequency-selective chiral photon-magnon interactions for reconfigurable on-chip microwave devices.

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Area of Science:

Metamaterials
Photonics
Spintronics

Background:

Conventional spin-momentum locking (SML) dictates spin based on propagation direction.
Metamaterials offer unique electromagnetic properties.
Controlling spin-wave interactions is crucial for advanced devices.

Purpose of the Study:

To demonstrate spin-refractive-index locking (SRIL) in composite right-left-handed transmission-line metamaterials.
To explore frequency-selective chiral photon-magnon interactions.
To develop reconfigurable on-chip devices for spin-selective microwave control.

Main Methods:

Fabrication of a composite right-left-handed transmission-line metamaterial.
Integration with a yttrium iron garnet (YIG) sphere.
Analysis of surface mode spin and effective refractive index.
Investigation of photon-magnon coupling and nonreciprocity.

Main Results:

Demonstration of spin-refractive-index locking (SRIL), where transverse spin locks to the refractive index sign.
Observation of reversed spin for the same energy propagation direction in right- and left-handed bands, distinct from SML.
Achieved strong, frequency-selective chiral photon-magnon interaction.
Exhibited nonreciprocity where magnons couple to microwaves of matching spin, with direction determined by the operating band.

Conclusions:

SRIL provides a novel mechanism for spin control in metamaterials.
The developed system enables dynamic switching of coupling direction by tuning frequency.
This research paves the way for compact, reconfigurable on-chip devices for spin-selective microwave control and nonreciprocal signal processing.