We have built and tested a large area multiturn superfluid He phase slip gyroscope. This device demonstrates quantum-mechanical phase coherence of superfluid He over a macroscopic length scale ~1.4 m!. The sensing loop area of this device is two orders of magnitude larger than our proof-of-principle model, with an improvement in sensitivity of ;20 over any other superfluid He gyroscope. We find...

We describe recent progress in the numerical study of the structure of rapidly rotating superfluid neutron star models in full general relativity. The superfluid neutron star is described by a model of two interpenetrating and interacting fluids, one representing the superfluid neutrons and the second consisting of the remaining charged particles (protons, electrons, muons). We consider general...

In the underdoped, overdoped, Zn-doped or stripe-forming regions of high-Tc cuprate superconductors (HTSC), the superfluid density ns/m∗ at T → 0 shows universal correlations with Tc. Similar strong correlations exist between 2dimensional superfluid density and superfluid transition temperature in thin films of He in non-porous or porous media, and He/He film adsorbed on porous media. Based on ...

We establish the full ground state phase diagram of the disordered Bose-Hubbard model in two dimensions at a unity filling factor via quantum Monte Carlo simulations. Similarly to the three-dimensional case we observe extended superfluid regions persisting up to extremely large values of disorder and interaction strength which, however, have small superfluid fractions and thus low transition te...

I present here a microscopic theory for the superfluidity of 4 He (He II) derived from experiments, and answer its essential questions. With a " momenton " model, the superfluid is shown to feature as a " harmonic superfluid ". In which a new bonding type, the " superfluid bond " , is formed. Its activation causes the anomalous thermal excitation, the large excess of specific heat, etc. The sup...

A simple superfluid model with an effective four body interaction of monopole pairing type is used to explain the staggering of the charge radii in the isotope chains. The contribution of deformation and of the particle number projection are analyzed for the Sn isotopes. Good results are obtained for the staggering parameters and neutron pairing energies. PACS numbers: 21.10.Dr, 21.10.Ft, 21.30...

Based on the integrable Gaudin model and local density approximation, we discuss the ground state of a one-dimensional trapped Fermi gas with imbalanced spin population, for an arbitrary attractive interaction. A phase separation state, with a polarized superfluid core immersed in an unpolarized superfluid shell, emerges below a critical spin polarization. Above it, coexistence of polarized sup...

We propose a novel four-coloring model which describes "frustrated superfluidity" of p-band bosons in the diamond optical lattice. The superfluid phases of the condensate wave functions on the diamond-lattice bonds are mapped to four distinct colors at low temperatures. The fact that a macroscopic number of states satisfy the constraints that four differently colored bonds meet at the same site...

We show that correlated pair tunneling drives a phase transition to a twisted superfluid with a complex order parameter. This unconventional superfluid phase spontaneously breaks the time-reversal symmetry and is characterized by a twisting of the complex phase angle between adjacent lattice sites. We discuss the entire phase diagram of the extended Bose-Hubbard model for a honeycomb optical la...