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Updated: Apr 6, 2026
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
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Exceptional point and hysteresis trajectories in cold Rydberg atomic gases
Jun Zhang1,2, En-Ze Li1,2, Ya-Jun Wang1,2
1Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui, China.
Nature Communications
|April 13, 2025
Summary
Researchers observed interaction-induced exceptional points in cold Rydberg atomic gases, revealing non-Hermitian many-body dynamics and broken symmetry. This study explores the complex interplay between long-range interactions and non-Hermiticity in matter.
Area of Science:
- Quantum physics
- Atomic physics
- Many-body systems
Background:
- Long-range interactions and coherent driving create complex patterns and novel phases in many-body systems.
- These interactions can also cause dissipation, leading to non-Hermitian dynamics and exceptional points.
Purpose of the Study:
- To experimentally observe interaction-induced exceptional points in cold Rydberg atomic gases.
- To investigate the resulting non-Hermitian dynamics and symmetry breaking.
Main Methods:
- Experimental measurement of transmission spectrum in cold Rydberg atomic gases.
- Varying probe intensity to observe hysteresis trajectories.
- Recording and analyzing hysteresis loop areas and dynamics.
Main Results:
- Experimental observation of interaction-induced exceptional points.
- Revealed breaking of charge-conjugation parity symmetry.
- Observed hysteresis trajectories indicating non-Hermitian dynamics.
Conclusions:
- Cold Rydberg atomic gases exhibit interaction-induced exceptional points.
- These findings offer insights into non-Hermitian physics in many-body systems.
- Enables study of the interplay between long-range interactions and non-Hermiticity.
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