GHOST PLASMON AND NEGATIVE DIELECTRIC FUNCTION

GHOST PLASMON AND NEGATIVE DIELECTRIC FUNCTION
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鬼等离子体激元和负介电功能

DOI:
10.1103/physrevb.56.4872
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发表时间:
1997
期刊:
影响因子:
3.7
通讯作者:
E. Lipparini
E. Lipparini
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
K. Takayanagi;E. Lipparini

文献摘要

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我们明确地表明,一个负值的静态介电函数必然意味着什么可能被称为一个鬼等离子体的存在,{open_quotes}一个极点的屏蔽响应{chi}{sup sc}(q,{omega})的虚轴上的{omega}。鬼等离子体激元是耗尽大部分电导率求和规则的集体状态。这是证明了一个二维电子气的微观计算。{版权} {美国物理学会}
We show explicitly that a negative value of the static dielectric function necessarily means the existence of what might be called a {open_quotes}ghost plasmon,{close_quotes} a pole of the screened response {chi}{sup sc}(q,{omega}) on the imaginary axis of {omega}. The ghost plasmon is a collective state exhausting most of the conductivity sum rule. This is demonstrated for a two-dimensional electron gas with a microscopic calculation. {copyright} {ital 1997} {ital The American Physical Society}