Phys. Rev. A 2, 256–258 (1970)Speculations on Bose-Einstein Condensation and Quantum CrystalsReceived 13 May 1969; published in the issue dated July 1970 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. © 1970 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.2.256
DOI:
10.1103/PhysRevA.2.256
PACS:
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