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Few-Body Precursor of the Higgs Mode in a Fermi Gas
J Bjerlin1, S M Reimann1, G M Bruun2
1Mathematical Physics, LTH, Lund University, SE-22100 Lund, Sweden.
Physical Review Letters
|April 30, 2016
Summary
We found a precursor to the Higgs mode in Fermi gases. This mode
Area of Science:
- Quantum physics
- Atomic physics
- Condensed matter physics
Background:
- The Higgs mode is a fundamental excitation in many-body systems.
- Investigating precursors to collective modes provides insight into quantum phase transitions.
Purpose of the Study:
- To demonstrate and characterize a few-body precursor of the Higgs mode in a harmonically trapped Fermi gas.
- To explore the dependence of this mode on interaction strength and particle number.
Main Methods:
- Exact diagonalization of the quantum system.
- Analysis of the lowest monopole mode frequency.
- Investigation of mode composition and excitation mechanisms.
Main Results:
- The monopole mode frequency exhibits non-monotonic dependence on interaction strength, with a minimum in the crossover region.
- This minimum deepens with increasing particle number, indicating a connection to the many-body Higgs mode.
- The mode is primarily composed of coherent excitations of time-reversed pairs.
Conclusions:
- The identified mode serves as a few-body analog of the many-body Higgs mode.
- This precursor mode can be selectively excited by tuning the interaction strength via Feshbach resonances.
- This provides a novel experimental pathway to study Higgs mode precursors in cold atomic gases.
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