Decoupled sound and amplitude modes in trapped dipolar supersolids
arxiv(2024)
摘要
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.
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