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Few-body precursor of the higgs mode in a fermi gas

Bjerlin, J. LU ; Reimann, S. M. LU and Bruun, G. M. LU (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
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
116
issue
15
publisher
American Physical Society
external identifiers
  • Scopus:84963815824
  • WOS:000373884500004
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
2016-11-13 04:39:32
@misc{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    = {ARRAY(0x855e1b0)},
  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},
  volume       = {116},
  year         = {2016},
}