CHARGED BOSON GAS
CHARGED BOSON GAS
复制标题
带电玻色子气体
DOI：
10.1103/physrev.124.649
复制
发表时间：
1961
期刊：
影响因子：
--
通讯作者：
L. Foldy
中科院分区：
文献类型：
--
作者：
L. Foldy
利用博戈留波夫为玻色气体所发展的方法，研究了高密度下玻色子带电气体的基态能量和元激发。据推测（但未得到证实），在高密度极限下，该方法能得出与带电费米子气体相应情形所得到的类似的精确结果。基态能量本质上是关联能，因此是负的，并且在高密度下其大小随密度的四分之一次幂变化。对于低动量，元激发具有适合等离子体波的能量，对于高动量则具有适合单粒子激发的能量。因此存在一个能隙，这表明该气体在低温下既是超流体又是超导体。在低密度下，带电气体的行为与统计性质无关；因此，当系统膨胀时，这样的能隙必然会消失。（作者）
The ground state energy and elementary excitations of a charged gas of bosons at high densities are examined by use of the method developed by Bogoliubov for boson gases. It is conjectured, but not established, that this method yields exact results in the high-density limit analogous to those obtained in the corresponding case of a charged fermion gas. The ground state energy is essentially correlation energy, and is therefore negative, and its magnitude varies as the one-fourth power of the density at high densities. The elementary excitations have for low momenta the energy appropriate to plasma waves, and for nigh momenta the energy appropriate to single-particle excitation. There is thcrefore an energy gap, suggesting that the gas is both a superfluid and a superconductor at low temperatures. At low densities the behavior of a charged gas is independent of statistics; hence, such a gap must disappear as the system is expanded. (auth)