Plasma waves in two-dimensional electron-hole system in gated graphene heterostructures

被引:202
作者
Ryzhii, V. [1 ]
Satou, A.
Otsuji, T.
机构
[1] Univ Aizu, Comp Solid State Phys Lab, Aizu Wakamatsu 9658580, Japan
[2] Tohoku Univ, Res Inst Elect Commun, Sendai, Miyagi 9808577, Japan
基金
日本学术振兴会;
关键词
D O I
10.1063/1.2426904
中图分类号
O59 [应用物理学];
学科分类号
摘要
Plasma waves in the two-dimensional electron-hole system in a graphene-based heterostructure controlled by a highly conducting gate are studied theoretically. The energy spectra of two-dimensional electrons and holes are assumed to be conical (neutrinolike), i.e., corresponding to their zero effective masses. Using the developed model, we calculate the spectrum of plasma waves (spatio-temporal variations of the electron and hole densities and the self-consistent electric potential). We find that the sufficiently long plasma waves exhibit a linear (soundlike) dispersion, with the wave velocity determined by the gate layer thickness, the gate voltage, and the temperature. The plasma wave velocity in graphene heterostructures can significantly exceed the plasma wave velocity in the commonly employed semiconductor gated heterostructures. The gated graphene heterostructures can be used in different voltage tunable terahertz devices which utilize the plasma waves. (c) 2007 American Institute of Physics.
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页数:5
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