A Gaussian variational approach shows pair superfluidity persists against finite single-particle hopping in quasi-flat bosonic bands before transitioning to conventional superfluidity, with a derived sound-speed relation to a quantum geometric kernel.
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Competition between pair and single-particle superfluidity in bosonic quasi-flat bands: A Gaussian state approach
A Gaussian variational approach shows pair superfluidity persists against finite single-particle hopping in quasi-flat bosonic bands before transitioning to conventional superfluidity, with a derived sound-speed relation to a quantum geometric kernel.