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Many physicists believed it could not be done, but now a team in Germany has created a Bose–Einstein condensate (BEC) from photons. BECs are formed when identical bosons – particles with integer spin ...
Superposition states of ultracold bosons in rotating rings with a weak potential barrier
Superposition states ultracold bosons weak potential barrier
2010/11/23
We study ultracold bosons in a one-dimensional rotating ring lattice with a weak potential barrier well below unit filling. Due to the potential barrier the eigenstates are superpositions of different...
Dynamic Stimulation of Quantum Coherence in Lattice Bosons
Dynamic Stimulation Quantum Coherence in Lattice Bosons
2010/11/19
Thermal fluctuations tend to destroy long-range phase correlations. Consequently, bosons in a lattice will undergo a transition from a phase-coherent superfluid as the temperature rises. Contrary to c...
Perturbative correction to the ground state properties of one-dimensional strongly interacting bosons in a harmonic trap
Perturbative correction ground state properties harmonic trap
2010/11/19
We calculate the rst order perturbation correction to the ground state energy and chemical
potential of a harmonically trapped boson gas with contact interactions about the in nite repulsion Tonks-G...
Experimental realities refuting the existence of p=0 condensate in a system of interacting bosons : II. Spectroscopy of embedded molecules
molecular-rotations helium-clusters BEC Ground-state bosons helium-4
2010/11/22
Experimental observation of superfluidity in a microscopic cluster, M : (4He)x, of a
molecule (M) and x number of 4He atoms (with x ranging from 1 to many) is qualitatively
analyzed. It concludes th...
Experimental realities refuting existence of p=0 condensate in a system of interacting bosons : I. Electron bubble
BEC bosons electron-bubble He-4
2010/11/18
Physical reality of the existence of electron bubble in liquid 4He (or 3He) renders
a clear experimental evidence for a quantum particle (in an interacting environment as
seen by electron in liquid ...
Crystalline phase for one-dimensional ultra-cold atomic bosons
Crystalline phase one-dimensional ultra-cold atomic bosons
2010/10/27
We study cold atomic gases with a contact interaction and confined into one-dimension. Crossing
the confinement induced resonance the correlation between the bosons increases, and introduces an effec...
Comment on "Entanglement of two interacting bosons in a two-dimensional isotropic harmonic trap" [Phys. Lett. A 373 (2009) 3833]
Schmidt decomposition
2010/10/18
The correct form of the Schmidt decomposition of the stationary wave functions for a system of two interacting particles trapped in a two-dimensional harmonic potential is given