Institut für Festkörperphysik, Leibniz-Universität Hannover, Appelstrasse 2, 30167 Hannover, Germany.
J Phys Condens Matter. 2011 Jan 12;23(1):012001. doi: 10.1088/0953-8984/23/1/012001. Epub 2010 Nov 26.
The quasiparticle dynamics of the sheet plasmons in epitaxially grown graphene layers on SiC(0001) has been studied systematically as a function of temperature, intrinsic defects, influence of multilayers and carrier density using electron energy loss spectroscopy with high energy and momentum resolution. The opening of an inter-band decay channel appears as an anomalous kink in the plasmon dispersion which we describe as a resonance effect in the formation of electron-hole pairs. Due to the inevitable strong coupling of plasmons with single particle excitations in reduced dimensions, such signatures are generally expected.
我们使用具有高能和动量分辨率的电子能量损失谱系统地研究了 SiC(0001) 外延生长的石墨烯层中的片状等离激元的准粒子动力学，研究内容包括温度、本征缺陷、多层结构的影响和载流子密度。在等离激元色散中出现了一个反常的扭结，我们将其描述为形成电子-空穴对的共振效应，这表明在带间衰减通道的开启。由于在缩小的尺寸中，等离激元与单粒子激发的强耦合是不可避免的，因此通常会出现这种特征。
