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Photonic Topological Spin Pump in Synthetic Frequency Dimensions
Joseph Suh1, Gyunghun Kim1, Hyungchul Park1
1Intelligent Wave Systems Laboratory, Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Korea.
Physical Review Letters
|February 2, 2024
Summary
Researchers demonstrate a novel photonic system for topological pumping of pseudospin modes using synthetic frequency dimensions. This scalable, room-temperature approach reproduces Laughlin's topological pump experiment with enhanced control and wave front molding.
Area of Science:
- Wave physics
- Topological photonics
- Quantum Hall effect
Background:
- Reducing geometrical complexity is crucial for wave physics studies.
- Laughlin's topological pump elucidates quantum Hall states in specific geometries.
- Photonic synthetic dimensions are an active area of research.
Purpose of the Study:
- To propose a two-dimensional dynamical photonic system for topological pumping.
- To exploit synthetic frequency dimensions for pseudospin mode pumping.
- To reproduce Laughlin's thought experiment in a scalable, room-temperature setup.
Main Methods:
- Utilizing a two-dimensional dynamical photonic system.
- Exploiting synthetic frequency dimensions for pseudospin mode pumping.
- Implementing independent control of pseudomagnetic fields and electromotive forces via gauge fields.
- Defining an adjusted local Chern marker to address system boundaries and periodicity.
Main Results:
- Demonstrated topological pumping of pseudospin modes.
- Achieved independent control over pseudomagnetic fields and electromotive forces.
- Proved nontrivial topology using the adjusted local Chern marker.
- Showcased adiabatic pumping for crosstalk-free frequency conversion with wave front molding.
Conclusions:
- The proposed system offers a scalable, room-temperature platform for topological pumping.
- This approach enables the reproduction of Laughlin's topological pump experiment.
- The method allows for precise control over wave properties and frequency conversion.
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