Multipair excitations in the two-dimensional electron gas

被引：2
|
作者：
Pederiva, F [1 ]
Emperador, A
Lipparini, E
机构：
[1] Univ Trent, Dipartimento Fis, I-38050 Trento, Italy
[2] Univ Trent, INFM, I-38050 Trento, Italy
来源：
PHYSICAL REVIEW B | 2002年 / 66卷 / 15期
关键词：
D O I：
10.1103/PhysRevB.66.153320
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present a sum-rule study of spin multipair excitations in the two-dimensional electron gas. The cubic-energy-weighted sum rule m(3)=integralS(q,omega)omega(3)domega is microscopically calculated taking into account the effect of dynamical correlations. The comparison among exact sum rules and the ones derived within Landau theory allows us to give a proper estimate of the average spin multipair excitation energy and a rigorous lower bound for the multipair contribution to the static form factor in the low-q limit. The relative importance of spin multipair excitations in two- and three-dimensional electron gases is discussed. Finally, numerical results of the contribution of multipair excitations to the m(3) sum rule in the density channel are given.
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页码：1 / 4
页数：4
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