3RD-FREQUENCY-MOMENT SUM-RULE AND LONG-WAVELENGTH PLASMON DISPERSION IN LAYERED ELECTRON LIQUIDS

被引:20
作者
GOLDEN, KI [1 ]
LU, DX [1 ]
机构
[1] NANJING UNIV, DEPT PHYS, NANJING 210008, PEOPLES R CHINA
来源
PHYSICAL REVIEW A | 1992年 / 45卷 / 02期
关键词
D O I
10.1103/PhysRevA.45.1084
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We derive the third-frequency-moment (omega-3) sum rule and exact high-frequency dielectric response function for the layered electron liquid in zero magnetic field. The latter is examined in the kd --> 0 and kd --> infinity limits characteristic of bulk behavior and two-dimensional (2D) single-layer behavior, respectively (k is the 2D wave number, d is the distance between any two adjacent layers). We incorporate the correlational part of the omega-3 sum rule into a mean-field-theory description of the long-wavelength dispersion of the in-phase and out-of-phase plasmon modes in the presence of very strong correlations.
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页码:1084 / 1088
页数:5
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