Dynamics of a Fermi Gas Quenched to Unitarity

P. Dyke; A. Hogan; I. Herrera; C. C.N. Kuhn; S. Hoinka; C. J. Vale

doi:10.1103/PhysRevLett.127.100405

Dynamics of a Fermi Gas Quenched to Unitarity

P. Dyke, A. Hogan, I. Herrera, C. C.N. Kuhn, S. Hoinka, C. J. Vale

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We present an experimental study of a two component Fermi gas following an interaction quench into the superfluid phase. Starting with a weakly attractive gas in the normal phase, interactions are ramped to unitarity at a range of rates and we measure the subsequent dynamics as the gas approaches equilibrium. Both the formation and condensation of fermion pairs are mapped via measurements of the pair momentum distribution and can take place on very different timescales, depending on the adiabaticity of the quench. The contact parameter is seen to respond very quickly to changes in the interaction strength, indicating that short-range correlations, based on the occupation of high-momentum modes, evolve far more rapidly than the correlations in low-momentum modes necessary for pair condensation.

Original language	English
Article number	100405
Pages (from-to)	1-6
Number of pages	6
Journal	Physical Review Letters
Volume	127
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevLett.127.100405
Publication status	Published - 31 Aug 2021
Externally published	Yes

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10.1103/PhysRevLett.127.100405

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title = "Dynamics of a Fermi Gas Quenched to Unitarity",

abstract = "We present an experimental study of a two component Fermi gas following an interaction quench into the superfluid phase. Starting with a weakly attractive gas in the normal phase, interactions are ramped to unitarity at a range of rates and we measure the subsequent dynamics as the gas approaches equilibrium. Both the formation and condensation of fermion pairs are mapped via measurements of the pair momentum distribution and can take place on very different timescales, depending on the adiabaticity of the quench. The contact parameter is seen to respond very quickly to changes in the interaction strength, indicating that short-range correlations, based on the occupation of high-momentum modes, evolve far more rapidly than the correlations in low-momentum modes necessary for pair condensation.",

author = "P. Dyke and A. Hogan and I. Herrera and Kuhn, {C. C.N.} and S. Hoinka and Vale, {C. J.}",

note = "Funding Information: We thank Tapio Simula, Meera Parish, Jesper Levinsen, and Matthew Davis for helpful discussions and feedback on the manuscript. This research was supported by the ARC Centre of Excellence in Future Low-Energy Electronics Technologies (CE170100039). Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

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doi = "10.1103/PhysRevLett.127.100405",

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AU - Dyke, P.

AU - Hogan, A.

AU - Herrera, I.

AU - Kuhn, C. C.N.

AU - Hoinka, S.

AU - Vale, C. J.

N1 - Funding Information: We thank Tapio Simula, Meera Parish, Jesper Levinsen, and Matthew Davis for helpful discussions and feedback on the manuscript. This research was supported by the ARC Centre of Excellence in Future Low-Energy Electronics Technologies (CE170100039). Publisher Copyright: © 2021 American Physical Society.

PY - 2021/8/31

Y1 - 2021/8/31

N2 - We present an experimental study of a two component Fermi gas following an interaction quench into the superfluid phase. Starting with a weakly attractive gas in the normal phase, interactions are ramped to unitarity at a range of rates and we measure the subsequent dynamics as the gas approaches equilibrium. Both the formation and condensation of fermion pairs are mapped via measurements of the pair momentum distribution and can take place on very different timescales, depending on the adiabaticity of the quench. The contact parameter is seen to respond very quickly to changes in the interaction strength, indicating that short-range correlations, based on the occupation of high-momentum modes, evolve far more rapidly than the correlations in low-momentum modes necessary for pair condensation.

AB - We present an experimental study of a two component Fermi gas following an interaction quench into the superfluid phase. Starting with a weakly attractive gas in the normal phase, interactions are ramped to unitarity at a range of rates and we measure the subsequent dynamics as the gas approaches equilibrium. Both the formation and condensation of fermion pairs are mapped via measurements of the pair momentum distribution and can take place on very different timescales, depending on the adiabaticity of the quench. The contact parameter is seen to respond very quickly to changes in the interaction strength, indicating that short-range correlations, based on the occupation of high-momentum modes, evolve far more rapidly than the correlations in low-momentum modes necessary for pair condensation.

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Dynamics of a Fermi Gas Quenched to Unitarity

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