Elementary Excitations in Cylinder Bundles

概要

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Elenaentary excitations in a cylinder btund[e, which is formed by packing the $01116 hollowtubules into a two-diunensional triangular lattice, are sttzdied. The dielectric response ftrnction iscalculated within the linear response approxitaaation. The electronic excitations of the cylinderbtrndle are the superposition of those of all ttrbtrles. Due to the intertube Cotrlornb interactions,their characteristics quite differ fronn those of an isolated ttrbtr[e. The plasunon, which correspondsto the coherent oscillations of all carriers, could exhibit a prominent peak in excitation spectrutta.The excitation properties strongly depend on the tttbtrlar raditrs, the effective electron l11dSS, andthe nuagnitude and the direction of the momentuuau transfer (Q). At stnall naomenturn, thereexists a simple relation between excitation properties arnd polar angles (0 ' s). Both intensityof excitation spectrutn and p[asmon freqtrency decrease as 0 increases. The collective plasrnztoscillations parallel and perpendictular to the ttubular axis contrast sharply with each other, whichclearly illtrstrates the anisotropic behavior. The ratio between these two plasmon freqtrencies isfotrnd to be snaaller than =?.
社団法人日本物理学会の論文
1998-07-15