Abstract
The recent experimental observation of steplike structure in the superfluid density of He4 films on graphite is interpreted in terms of passage close to Mott insulating lobes in the Bose-Hubbard model. Plateaus develop in the superfluid density near the completion of each layer because of the He-He repulsion. We modify the Bose-Hubbard Hamiltonian, using a density-dependent He-He interaction term to model the He-substrate potential. Quantum Monte Carlo simulations yield results that agree well with the experimental data.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 6515-6518 |
| Number of pages | 4 |
| Journal | Physical Review B |
| Volume | 50 |
| Issue number | 9 |
| DOIs | |
| State | Published - 1994 |
| Externally published | Yes |