Size quantization effects in thin film Casimir interaction

被引:1
|
作者
Benassi, A. [1 ]
Calandra, C. [2 ]
机构
[1] CNR INFM Natl Res Ctr NanoStruct & BioSyst Surfac, Via Campi 213-A, I-41100 Modena, Italy
[2] Univ Modena & Reggio Emilia, Dipartimento Fis, I-41100 Modena, Italy
来源
60 YEARS OF THE CASIMIR EFFECT | 2009年 / 161卷
关键词
QUANTUM; FORCE; ELECTRON; PHOTOEMISSION; DENSITY; ENERGY; STATES;
D O I
10.1088/1742-6596/161/1/012007
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
We investigate the role of size quantization in the vacuum force between metallic films of nanometric thickness. The force is calculated by the Lifshitz formula with the film dielectric tensor derived from the one-electron energies and wavefunctions under the assumption of a constant potential inside the film and a uniform distribution of the positive ion charge. The results show that quantization effects tend to reduce the force with respect to the continuum plasma model. The reduction is more significant at low electron densities and for film size of the order of few nanometers and persists for separation distances up to 10-50 nm. Comparison with previous work indicates that the softening of the boundary potential is important in determining the amount of the reduction. The calculations are extended to treat Drude intraband absorption. It is shown that the inclusion of relaxation time enhances the size quantization effects in the force calculations.
引用
收藏
页数:14
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