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Interface modes in planar one-dimensional magnonic crystals
Szymon Mieszczak1, Jarosław W Kłos2
1Institute of Spintronics and Quantum Information, Faculty of Physics, Adam Mickiewicz University, Poznań, Poland. szymon.mieszczak@amu.edu.pl.
Scientific Reports
|July 5, 2022
Summary
We introduce the Zak phase for spin waves in magnonic crystals, revealing interface modes at boundaries. Shifting unit cells controls these modes, demonstrating bulk-to-edge correspondence.
Area of Science:
- Condensed Matter Physics
- Spintronics
- Topological Materials
Background:
- Spin waves propagate as excitations in magnetic materials.
- Magnonic crystals offer tunable control over spin wave propagation.
- Topological concepts are increasingly applied to condensed matter systems.
Purpose of the Study:
- To introduce and explore the Zak phase concept for spin waves in planar magnonic crystals.
- To investigate the existence conditions and properties of interface modes.
- To establish a bulk-to-edge correspondence for these topological modes.
Main Methods:
- Theoretical analysis using symmetry criteria and logarithmic derivative of Bloch functions.
- Numerical verification of theoretical predictions.
- Extension of the model to non-centrosymmetric unit cells and investigation of dipolar interactions.
Main Results:
- Demonstration of interface modes localized at the boundary of magnonic crystals.
- Confirmation of bulk-to-edge correspondence for spin wave topological modes.
- Control over interface mode propagation by unit cell shifting and inclusion of dipolar interactions.
Conclusions:
- The Zak phase provides a framework for understanding topological phenomena in magnonic systems.
- Interface modes exhibit tunable properties influenced by crystal symmetry and interactions.
- This work opens avenues for designing novel magnonic devices with tailored functionalities.
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