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• W1775452575 abstract "The Higgs mode corresponds to the collective motion of particles due to the vibrations of an invisible field. It plays a fundamental role for our understanding of both low and high energy physics, giving elementary particles their mass and leading to collective modes in condensed matter and nuclear systems. The Higgs mode has been observed in a limited number of table-top systems, where it however is characterised by a short lifetime due to decay into a continuum of modes. A major goal which has remained elusive so far, is therefore to realise a long-lived Higgs mode in a controllable system. Here, we show how an undamped Higgs mode can be observed unambiguously in a Fermi gas in a two-dimensional trap, close to a quantum phase transition between a normal and a superfluid phase. We develop a first-principles theory of the pairing and the associated collective modes, which is quantitatively reliable when the pairing energy is much smaller than the trap level spacing, yet simple enough to allow the derivation of analytical results. The theory includes the trapping potential exactly, which is demonstrated to stabilize the Higgs mode by making its decay channels discrete. Our results show how atoms in micro-traps can unravel properties of a long-lived Higgs mode, including the role of confinement and finite size effects." @default.
• W1775452575 created "2016-06-24" @default.
• W1775452575 creator A5046162654 @default.
• W1775452575 date "2014-08-14" @default.
• W1775452575 modified "2023-10-18" @default.
• W1775452575 title "Long-lived Higgs mode in a two-dimensional confined Fermi system" @default.
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• W1775452575 doi "https://doi.org/10.1103/physreva.90.023621" @default.
• W1775452575 hasPublicationYear "2014" @default.
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