Abstract
It is shown, by almost rigorous arguments, that there exist many-body states of a system of interacting bosons which exhibit both crystalline order and Bose-Einstein condensation into the zero-momentum eigenstate of the single-particle density matrix. The implications of this result are discussed in relation to theories of superfluidity and the nature of quantum crystals.
- Received 13 May 1969
DOI:https://doi.org/10.1103/PhysRevA.2.256
©1970 American Physical Society