PROPERTIES OF FERMI LIQUIDS WITH A FINITE-RANGE INTERACTION
PROPERTIES OF FERMI LIQUIDS WITH A FINITE-RANGE INTERACTION
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DOI：
10.1051/jp1:1992156
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发表时间：
1992-04-01
期刊：
影响因子：
--
通讯作者：
NOZIERES, P
中科院分区：
文献类型：
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作者：
NOZIERES, P
根据Khodel和Shaginyan(KS)的建议，当相互作用范围较大时，Hartree Fock描述费米液体会导致非常奇怪的结果。例如，费米能级的粒子分布的急剧下降可以在有限的k范围内涂抹，准粒子能量具有平坦的平台。在实践中，这种效应看起来像是哈特里·福克近似的产物。KS效应只发生在引力上，在这种情况下，它被超导电性所掩盖。此外，增强的准粒子碰撞率使得Hartree Fock近似不成立。最后，对强长程相互作用的屏蔽使得不稳定阈值无法达到。
Following a suggestion of Khodel' and Shaginyan (KS), it is shown that a Hartree Fock description of Fermi liquids can lead to very strange results when the interaction has long range. For instance, the sharp drop of particle distribution at the Fermi level can be smeared over a finite k-range, with a flat plateau in the quasiparticle energy. In practice, such an effect appears as an artefact of the Hartree Fock approximation. The KS effect occurs only for an attraction, in which case it is hidden by superconductivity. Moreover, the enhanced quasiparticle collision rate makes the Hartree Fock approximation untenable. Finally, screening of a strong long range interaction is such that the instability threshold cannot be reached.