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Compact localized states in magnonic Lieb lattices
Grzegorz Centała1, Jarosław W Kłos2
1Institute of Spintronics and Quantum Information, Faculty of Physics, Adam Mickiewicz University, Poznań, Uniwersytetu Poznańskiego 2, 61-614, Poznań, Poland.
Scientific Reports
|August 4, 2023
Summary
Researchers created a magnonic Lieb lattice, observing compact localized states (CLS) in a sub-micron structure. This demonstrates potential for novel magnonic devices utilizing flat bands and localized spin waves.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- The Lieb lattice is a simple bipartite lattice known for exhibiting compact localized states (CLS).
- Compact localized states arise from destructive interference within the unit cell's topology, localizing modes on specific sublattices.
- These phenomena have implications for novel wave localization and transport phenomena.
Purpose of the Study:
- To demonstrate the experimental realization of a magnonic Lieb lattice.
- To investigate the observation of flat bands and compact localized states in a magnonic system.
- To explore the potential for sub-micron scale magnonic devices.
Main Methods:
- Numerical investigation using the finite-element method.
- Utilizing a forward volume configuration with a Ga-doped Yttrium Iron Garnet (YIG) layer.
- Designing a structure with cylindrical inclusions arranged in a Lieb lattice with a 250 nm period.
Main Results:
- Successful numerical demonstration of a magnonic Lieb lattice structure.
- Observation of flat bands and compact localized states in the designed magnonic system.
- Identification of oscillatory spin waves in inclusions and evanescent spin waves in the matrix, characteristic of CLS.
Conclusions:
- The proposed magnonic Lieb lattice structure can host flat bands and compact localized states.
- This design enables the coupling of nodes (inclusions) via a matrix, leading to localized states.
- The findings open avenues for developing novel magnonic devices based on wave localization principles.
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