Acoustic Bound Pairs under Nonreciprocal Two-Body Interactions
Zhenhang Pu1, Yuxiang Xi1, Yugan Tang2
1Wuhan University, Key Laboratory of Artificial Micro- and Nanostructures of Ministry of Education and School of Physics and Technology, Wuhan 430072, China.
This study integrates nonreciprocity into two-body interactions, revealing novel phenomena like the non-Hermitian inverse skin effect and time cluster effect in correlated systems.
Area of Science:
- Quantum physics
- Condensed matter physics
Background:
- Non-Hermiticity expands many-body physics beyond the Hermitian paradigm.
- Existing research often treats many-body interactions as Hermitian.
- Nonreciprocity is a key mechanism inducing non-Hermiticity.
Purpose of the Study:
- To investigate the role of nonreciprocal two-body interactions in many-body systems.
- To analytically demonstrate how these interactions govern correlated pairs.
- To experimentally validate predictions in a phononic crystal simulator.
Main Methods:
- Analytical modeling of nonreciprocal two-body interactions.
- Experimental implementation using a phononic crystal simulator.
- Airborne sound measurements to capture emergent phenomena.
Main Results:
- Demonstrated control over correlated pairs via nonreciprocal interactions.
- Observed the non-Hermitian inverse skin effect: particles move synchronously as bound pairs against dominant hopping.
- Observed the time cluster effect: initially separate particles form lasting bound pairs over time.
Conclusions:
- Nonreciprocal many-body interactions drive unique physical phenomena.
- Experimental validation in a phononic system confirms theoretical predictions.
- Opens new avenues for engineering correlated quantum systems.
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