GHOST PLASMON AND NEGATIVE DIELECTRIC FUNCTION
GHOST PLASMON AND NEGATIVE DIELECTRIC FUNCTION
复制标题
鬼等离子体激元和负介电功能
DOI:
10.1103/physrevb.56.4872
复制
发表时间:
1997
影响因子:
3.7
通讯作者:
E. Lipparini
中科院分区:
文献类型:
--
作者:
K. Takayanagi;E. Lipparini
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}