Localized excitations at the Mott insulator-superfluid interfaces for confined Bose-Einstein condensates.
In this Letter, we derive the dispersion relation of the surface waves at the interfaces between Mott-insulating and superfluid domains for a two-dimensional Bose-Einstein condensate in an optical lattice subjected to a confining potential. We then calculate their contribution to the heat capacity of the system and show how its low-temperature scaling allows an experimental test of the existence and properties of Mott insulator-superfluid domains.
Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot, Israel.
Eros
E
Mariani
Ady
A
Stern