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We show that the ground state of an attractive Bose gas in a double well evolves from a coherent state to a Schrödinger Cat like state as the tunneling barrier is decreased. The latter exhibits super-fragmentation similar to the ground state of a spin-1 Bose gas with antiferromagnetic...
We consider a one-dimensional Josephson junction array, in the regime where the junction charging energy is much greater than the charging energy of the superconducting islands. In this regime we critically reexamine the continuum limit description and establish the relationship between...
Based on an attractive U Hubbard model on a lattice with up to second neighbor hopping we derive an effective Hamiltonian for phase fluctuations. The superconducting gap is assumed to have s-wave symmetry. The effective Hamiltonian we finally arrive at is of the extended XY type. While it...
Third sound is a surface wave that propagates on a superfluid helium thin film and involves both thickness and temperature oscillations in the film. These periodic variations of temperature will cause helium atoms to evaporate into and condense from the gas phase. Consequently, in an infinite...
We present results of a study of third sound in thick 4He films in circular resonator geometry. Frequency and line shapes of third sound resonances are measured for temperatures between 0.3 and 2.1 K in saturated films approximately 30 nm thick. From these measurements we calculate the...
The first-principle calculation within density-functional theory is used to investigate the hypothetical zinc-blende structured VBi. Our calculations indicate that the ZB-type VBi is predicted to be a true half-metallic ferromagnet with a magnetic moment of 2 μ
B per formula unit and the HM gap...
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