Accession Number : AD0687713

Title :   TWO KINDS OF BOSONS AND BOSE CONDENSATES.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF PHYSICS

Personal Author(s) : Kohn,W. ; Sherrington,D.

Report Date : 29 APR 1969

Pagination or Media Count : 45

Abstract : The paper deals with ordinary material systems, whose elementary constituents are fermions. It is pointed out that in such systems there can occur two kinds of bosons. Type I bosons are bound complexes of an even number of fermions (such as He4); and type II bosons are elementary excitations which are bound complexes of fermions and their holes (such as excitons). When the first type condenses a superfluid state results with so-called off-diagonal long range order; while when the second type condenses there is no superfluidity but a change in spatial order. Thus both kinds of long range order are related to Bose condensation. (Author)

Descriptors :   (*BOSONS, PHYSICAL PROPERTIES), SUPERFLUIDITY, SUPERCONDUCTIVITY, CRYSTAL DEFECTS, FERMIONS, HELIUM, EXCITONS, WAVE FUNCTIONS, MOMENTUM

Subject Categories : Quantum Theory and Relativity

Distribution Statement : APPROVED FOR PUBLIC RELEASE