Collective Modes of the Massless Dirac Plasma
Collective Modes of the Massless Dirac Plasma
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DOI：
10.1103/physrevlett.102.206412
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发表时间：
2009-05-22
影响因子：
8.6
通讯作者：
Hwang, E. H.
中科院分区：
文献类型：
--
作者：
Das Sarma, S.;Hwang, E. H.
我们发展了固体中带电无质量狄拉克粒子集合的长波等离子体振荡理论，例如，在掺杂石墨烯层中，通过远程库仑相互作用发生相互作用。我们发现，在这种掺杂的无质量狄拉克等离子体中，长波等离子体频率在所有维度上都是非经典的，等离子体频率与1/根(h) / bar成正比。我们还表明，由这种等离子体构成的D维超晶格的长波等离子体频率与相应的D + 1维体等离子体频率不一致。我们将这种狄拉克等离子体与金属和掺杂半导体中表现出通常的经典长波等离子体振荡的规则等离子体进行了比较和对比。
We develop a theory for the long-wavelength plasma oscillation of a collection of charged massless Dirac particles in a solid, as occurring, for example, in doped graphene layers, interacting via the long-range Coulomb interaction. We find that the long-wavelength plasmon frequency in such a doped massless Dirac plasma is explicitly nonclassical in all dimensions with the plasma frequency being proportional to 1/root(h) over bar. We also show that the long-wavelength plasma frequency of the D-dimensional superlattice made from such a plasma does not agree with the corresponding D + 1-dimensional bulk plasmon frequency. We compare and contrast such Dirac plasmons with the well-studied regular palsmons in metals and doped semiconductors which manifest the usual classical long-wavelength plasma oscillation.