In coupled Dicke lattices, frustration induces photonic density-wave ordering that is predictable from the symmetric-phase excitation spectrum, plus an emergent gapless mode in 1D and flux-tunable quasi-periodic order.
Monitoring and manipulating Higgs and Goldstone modes in a supersolid quantum gas
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abstract
Access to collective excitations lies at the heart of our understanding of quantum many-body systems. We study the Higgs and Goldstone modes in a supersolid quantum gas that is created by coupling a Bose-Einstein condensate symmetrically to two optical cavities. The cavity fields form a U(1)-symmetric order parameter that can be modulated and monitored along both quadratures in real time. This enables us to measure the excitation energies across the superfluid-supersolid phase transition, establish their amplitude and phase nature, as well as characterize their dynamics from an impulse response. Furthermore, we can give a tunable mass to the Goldstone mode at the crossover between continuous and discrete symmetry by changing the coupling of the quantum gas with either cavity.
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quant-ph 1years
2026 1verdicts
UNVERDICTED 1representative citing papers
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Frustrated superradiant phases in one- and two-dimensional lattices
In coupled Dicke lattices, frustration induces photonic density-wave ordering that is predictable from the symmetric-phase excitation spectrum, plus an emergent gapless mode in 1D and flux-tunable quasi-periodic order.