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Coherent oscillations of driven rf SQUID metamaterials
Melissa Trepanier1, Daimeng Zhang2, Oleg Mukhanov3
1Department of Physics, CNAM, University of Maryland, College Park, Maryland 20742, USA.
Physical Review. E
|June 17, 2017
Summary
We explored radio frequency superconducting quantum interference device (rf SQUID) metamaterials, finding that disorder degrades coherence. Methods to restore coherence include adjusting coupling, temperature, or rf flux amplitude.
Area of Science:
- Condensed Matter Physics
- Metamaterials Science
- Quantum Electronics
Background:
- Radio frequency superconducting quantum interference devices (rf SQUIDs) are key components in quantum electronics.
- Metamaterials exhibit unique electromagnetic properties derived from their structure.
- Understanding the coherence of interacting SQUIDs is crucial for their application in tunable, nonlinear metamaterials.
Purpose of the Study:
- To investigate the behavior of rf SQUID metamaterials.
- To explore the relationship between SQUID coherence and emergent electromagnetic properties.
- To identify methods for recovering coherence in disordered rf SQUID metamaterials.
Main Methods:
- Experimental measurements of rf SQUID metamaterial behavior.
- Numerical simulations to model SQUID interactions and properties.
- Analysis of the impact of dc flux gradients on coherence.
Main Results:
- rf SQUID metamaterials demonstrate extreme tunability and nonlinearity.
- Metamaterial properties are highly sensitive to the coherence of driven, interacting SQUIDs.
- Disorder, primarily from dc flux gradients, significantly reduces coherence.
Conclusions:
- Coherence in rf SQUID metamaterials can be recovered by optimizing parameters.
- Methods for restoring coherence include tuning inter-SQUID coupling, increasing temperature, or adjusting applied rf flux amplitude.
- These findings enable the design of more robust and controllable rf SQUID metamaterials.
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