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Observation of asymmetric transport in structures with active nonlinearities
N Bender1, S Factor1, J D Bodyfelt2
1Department of Physics, Wesleyan University, Middletown, Connecticut 06459, USA.
Physical Review Letters
|August 29, 2014
Summary
This study introduces asymmetric transport using parity-time-symmetric nonlinearities. Increasing conductance enhances both asymmetry and signal intensity, a novel finding for nonlinear systems.
Area of Science:
- Nonlinear dynamics
- Transport phenomena
- Quantum mechanics
Background:
- Parity-time (PT) symmetry offers unique properties in nonlinear systems.
- Asymmetric transport typically faces trade-offs between asymmetry and intensity.
Purpose of the Study:
- To present a novel mechanism for asymmetric transport based on PT-symmetric nonlinearities.
- To investigate the relationship between conductance strength, asymmetry, and transmittance intensity.
Main Methods:
- Theoretical modeling of PT-symmetric nonlinearities.
- Experimental demonstration using coupled Van der Pol oscillators with gain and loss.
- Proposal of an equivalent optical setup.
Main Results:
- An increase in complementary conductance strength simultaneously enhances asymmetry and transmittance intensity.
- This contrasts with conservative nonlinearities where such simultaneous increases are not observed.
- Experimental validation confirms the theoretical predictions.
Conclusions:
- PT-symmetric nonlinearities provide a pathway to overcome limitations in asymmetric transport.
- The proposed mechanism offers new possibilities for designing advanced transport devices.
- The findings have implications for both classical and quantum systems.
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