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Observing Higgs and Goldstone modes in a supersolid quantum gas

Philip Zupancic, Julian Léonard, Andrea Morales +2 more

Bulletin of the American Physical SocietyJun 6, 20170 citations

Sounds of a supersolid detected in dipolar atomic gases for the first time

Sean M. Mossman

NatureOct 16, 20191 citation

First and Second Sound Modes in a Uniform Fermi Gas

黄备兵, 完绍龙

Chinese Physics LettersJan 1, 20090 citations

Sound, Superfluidity, and Layer Compressibility in a Ring Dipolar Supersolid

Marija Šindik, Tomasz Zawiślak, Alessio Recati +1 more

We propose a protocol to excite the Goldstone modes of a supersolid dipolar Bose-Einstein condensed gas confined in a ring geometry. By abruptly removing an applied periodic modulation proportional to cos(φ), where φ is the azimuthal angle, we explore the resulting oscillations of the gas by solving the extended Gross-Pitaevskii equation. The value of the two longitudinal sound velocities exhibited in the supersolid phase are analyzed using the hydrodynamic theory of supersolids at zero temperature, which explicitly takes into account both the superfluid and the crystal nature of the system. This approach allows for the determination of the layer compressibility modulus as well as of the superfluid fraction, f_{S}, in agreement with the Leggett estimate of the nonclassical moment of inertia.We propose a protocol to excite the Goldstone modes of a supersolid dipolar Bose-Einstein condensed gas confined in a ring geometry. By abruptly removing an applied periodic modulation proportional to cos(φ), where φ is the azimuthal angle, we explore the resulting oscillations of the gas by solving the extended Gross-Pitaevskii equation. The value of the two longitudinal sound velocities exhibited in the supersolid phase are analyzed using the hydrodynamic theory of supersolids at zero temperature, which explicitly takes into account both the superfluid and the crystal nature of the system. This approach allows for the determination of the layer compressibility modulus as well as of the superfluid fraction, f_{S}, in agreement with the Leggett estimate of the nonclassical moment of inertia.

arXiv:2308.05981Physical Review LettersApr 3, 202429 citations

Decoupled sound and amplitude modes in trapped dipolar supersolids

Jens Hertkorn, Philipp Stürmer, K. Mukherjee +7 more

We theoretically investigate elementary excitations of dipolar quantum gases across the superfluid to supersolid phase transition in a toroidal trap. We show how decoupled first sound, second sound, and Higgs modes emerge by following their origin from superfluid modes across the transition. The structure of these excitations reveals the interplay between crystal and superfluid oscillations. Our results unify previous notions of coupled Goldstone and Higgs modes in harmonic traps, allowing us to establish a correspondence between excitations of trapped and infinitely extended supersolids. We propose protocols for selectively probing these sound and amplitude modes, accessible to state-of-the-art experiments. Published by the American Physical Society 2024We theoretically investigate elementary excitations of dipolar quantum gases across the superfluid to supersolid phase transition in a toroidal trap. We show how decoupled first sound, second sound, and Higgs modes emerge by following their origin from superfluid modes across the transition. The structure of these excitations reveals the interplay between crystal and superfluid oscillations. Our results unify previous notions of coupled Goldstone and Higgs modes in harmonic traps, allowing us to establish a correspondence between excitations of trapped and infinitely extended supersolids. We propose protocols for selectively probing these sound and amplitude modes, accessible to state-of-the-art experiments. Published by the American Physical Society 2024

arXiv:2404.12384Physical Review ResearchDec 5, 202416 citations

Quantum gases show flashes of a supersolid

Lode Pollet

NatureMay 20, 20199 citations

Supersolid-like sound modes in a driven quantum gas

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