Mottness induced superfluid phase fluctuation with increased density

Recent observation of diminishing superfluid phase stiffness upon increasing carrier density in cuprate high-temperature superconductors is unexpected from the quantum density-phase conjugation superfluidity. Here, through analytic estimation and verified via variational Monte Carlo calculation an emergent Bose liquid, we point out that Mottness underlying carriers can cause a stronger fluctuation with density. This effect turns expected density-increased into dome shape, good agreement recent observation. Specifically, effective mass divergence due to "jamming" low-energy bosons reproduces observed nonlinear relation between transition temperature. Our results suggest new paradigm, which unconventional superconductivity some strongly correlated materials described by physics bosonic superfluidity, as opposed pairing-strength limited Cooper pairing.