2 KINDS OF BOSONS AND BOSE CONDENSATES
2 KINDS OF BOSONS AND BOSE CONDENSATES
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DOI：
10.1103/revmodphys.42.1
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发表时间：
1970-01-01
影响因子：
44.1
通讯作者：
SHERRINGTON, D
中科院分区：
文献类型：
--
作者：
KOHN, W;SHERRINGTON, D
本文讨论的是基本成分是费米子的普通材料系统。指出在这样的系统中可能会出现两种物理和数学特性截然不同的玻色子。 I 型玻色子是偶数个费米子（例如 He 4）的束缚复合物； II 型玻色子是基本激发，是费米子及其空穴（例如激子）的束缚复合物。当第一种类型凝结时，会产生超流体状态，即所谓的非对角线长程有序；而第二种凝聚时，不存在超流性，而是空间秩序的变化。因此，两种长程有序都与玻色凝聚有关。
This paper deals with ordinary material systems whose elementary constitutents are fermions. It is pointed out that in such systems there can occur two kinds of bosons with quite different physical and mathematical characteristics. Type I bosons are bound complexes of an even number of fermions (such as He 4); 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.