Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-03-22
Phys. Rev. A 82, 041601(R) (2010)
Physics
Condensed Matter
Quantum Gases
Published version, 4 pages, 4 figures
Scientific paper
We propose an exactly solvable model to reveal the physics of the interplay between interaction and disorder in bosonic systems. Considering interacting bosons in a double-well potential, in which disorder is mimicked by taking the energy level mismatch between the two wells to be randomly distributed, we find "two negatives make a positive" effect. While disorder or interaction by itself suppresses the phase coherence between the two wells, both together enhance the phase coherence. This model also captures several striking features of the disordered Bose-Hubbard model found in recent numerical simulations. Results at finite temperatures may help explain why a recent experiment did not find any evidence for the enhancement of phase coherence in a disordered bosonic system.
Sarma Sankar Das
Zhou Qi
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