Bounds for the Superfluid Fraction from Exact Quantum Monte Carlo Local Densities

Abstract

For solid 4He and solid p-H2, using the flow-energy-minimizing one-body phase function and exact T=0 K Monte Carlo calculations of the local density, we have calculated the phase function, the velocity profile and upper bounds for the superfluid fraction f_s. At the melting pressure for solid 4He we find that f_s < 0.20-0.21, about ten times what is observed. This strongly indicates that the theory for the calculation of these upper bounds needs substantial improvements.

to be published in Phys. Rev. B (Brief Reports)

References in corpus (5)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Ring exchanges and the supersolid phase of 4He
• The fate of vacancy-induced supersolidity in 4He
• Bose Einstein Condensation of incommensurate solid 4He
• Search for Superfluidity in Solid Hydrogen

Cited by in corpus (6)

• Solid 4He and the Supersolid Phase: from Theoretical Speculation to the Discovery of a New State of Matter? A Review of the Past and Present Status of Research
• Path integral Monte Carlo ground state approach: Formalism, implementation, and applications
• Leggett's bound for amorphous solids
• Quantum crystallography of Rydberg-dressed Bose gases on a square lattice
• Dynamics of Supersolid state: normal fluid, superfluid, and supersolid velocities
• Impurity-controlled vortex mobility and pair-breaking in fermionic superfluid rings