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17 papers · 2 filters
Superfluid to Mott-insulator transition of cold atoms in optical lattices
N. Dupuis, K. Sengupta
We review the superfluid to Mott-insulator transition of cold atoms in optical lattices. The experimental signatures of the transition are discussed and the RPA theory of the Bose-…
Stability of a Bose-Einstein condensate revisited for composite bosons
M. Combescot, D. W. Snoke
It is known that elementary bosons condense in a unique state, not so much because this state has the lowest free particle energy but because it costs a macroscopic amount of energ…
Perturbative approach to an exactly solved problem: the Kitaev honeycomb model
J. Vidal, K. P. Schmidt, S. Dusuel
We analyze the gapped phase of the Kitaev honeycomb model perturbatively in the isolated-dimer limit. Our analysis is based on the continuous unitary transformations method which a…
Expansion of a quantum gas released from an optical lattice
F. Gerbier, S. Trotzky, S. Foelling +9
We analyze the interference pattern produced by ultracold atoms released from an optical lattice. Such interference patterns are commonly interpreted as the momentum distributions…
Internal structure of a quantum soliton and classical excitations due to trap opening
Yvan Castin
We analytically solve two problems that may be useful in the context of the recent observation of matter wave bright solitons in a one-dimensional attractive atomic Bose gas. The f…
Conical defects in growing sheets
Martin Michael Mueller, Martine Ben Amar, Jemal Guven
A growing or shrinking disc will adopt a conical shape, its intrinsic geometry characterized by a surplus angle at the apex. If growth is slow, the cone will find its equilibr…