TWO KINDS OF BOSONS AND BOSE CONDENSATES.
CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF PHYSICS
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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
- Quantum Theory and Relativity