Few-body precursor of the higgs mode in a fermi gas
(2016) In Physical Review Letters 116(15).- Abstract
We demonstrate that an undamped few-body precursor of the Higgs mode can be investigated in a harmonically trapped Fermi gas. Using exact diagonalization, the lowest monopole mode frequency is shown to depend nonmonotonically on the interaction strength, having a minimum in a crossover region. The minimum deepens with increasing particle number, reflecting that the mode is the few-body analogue of a many-body Higgs mode in the superfluid phase, which has a vanishing frequency at the quantum phase transition point to the normal phase. We show that this mode mainly consists of coherent excitations of time-reversed pairs, and that it can be selectively excited by modulating the interaction strength, using, for instance, a Feshbach... (More)
We demonstrate that an undamped few-body precursor of the Higgs mode can be investigated in a harmonically trapped Fermi gas. Using exact diagonalization, the lowest monopole mode frequency is shown to depend nonmonotonically on the interaction strength, having a minimum in a crossover region. The minimum deepens with increasing particle number, reflecting that the mode is the few-body analogue of a many-body Higgs mode in the superfluid phase, which has a vanishing frequency at the quantum phase transition point to the normal phase. We show that this mode mainly consists of coherent excitations of time-reversed pairs, and that it can be selectively excited by modulating the interaction strength, using, for instance, a Feshbach resonance in cold atomic gases.
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- author
- Bjerlin, J. LU ; Reimann, S. M. LU and Bruun, G. M. LU
- organization
- publishing date
- 2016-04-13
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review Letters
- volume
- 116
- issue
- 15
- article number
- 155302
- publisher
- American Physical Society
- external identifiers
-
- wos:000373884500004
- pmid:27127975
- scopus:84963815824
- ISSN
- 0031-9007
- DOI
- 10.1103/PhysRevLett.116.155302
- language
- English
- LU publication?
- yes
- id
- 376b859e-9525-4778-90f5-26cf61c20c86
- date added to LUP
- 2016-05-12 13:35:49
- date last changed
- 2024-01-04 03:27:54
@article{376b859e-9525-4778-90f5-26cf61c20c86,
abstract = {{<p>We demonstrate that an undamped few-body precursor of the Higgs mode can be investigated in a harmonically trapped Fermi gas. Using exact diagonalization, the lowest monopole mode frequency is shown to depend nonmonotonically on the interaction strength, having a minimum in a crossover region. The minimum deepens with increasing particle number, reflecting that the mode is the few-body analogue of a many-body Higgs mode in the superfluid phase, which has a vanishing frequency at the quantum phase transition point to the normal phase. We show that this mode mainly consists of coherent excitations of time-reversed pairs, and that it can be selectively excited by modulating the interaction strength, using, for instance, a Feshbach resonance in cold atomic gases.</p>}},
author = {{Bjerlin, J. and Reimann, S. M. and Bruun, G. M.}},
issn = {{0031-9007}},
language = {{eng}},
month = {{04}},
number = {{15}},
publisher = {{American Physical Society}},
series = {{Physical Review Letters}},
title = {{Few-body precursor of the higgs mode in a fermi gas}},
url = {{http://dx.doi.org/10.1103/PhysRevLett.116.155302}},
doi = {{10.1103/PhysRevLett.116.155302}},
volume = {{116}},
year = {{2016}},
}