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Recent observation of diminishing superfluid phase stiffness upon increasingcarrier density in cuprate high-temperature superconductors is unexpected fromthe quantum density-phase conjugation of superfluidity. Here, through analyticestimation and verified via variational Monte Carlo calculation of an emergentBose liquid, we point out that Mottness of the underlying carriers can cause astronger phase fluctuation of the superfluid with increasing carrier density.This effect turns the expected density-increased phase stiffness into a domeshape, in good agreement with the recent observation. Specifically, theeffective mass divergence due to "jamming" of the low-energy bosons reproducesthe observed nonlinear relation between phase stiffness and transitiontemperature. Our results suggest a new paradigm, in which unconventionalsuperconductivity in some strongly correlated materials is described by physicsof bosonic superfluidity, as opposed to pairing-strength limited Cooperpairing.

Mottness induced superfluid phase fluctuation with increased density