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采用格林函数方法研究了堆叠石墨片对锯齿型石墨纳米带电子输运性质的影响,计算了两种不同堆叠方式下锯齿型石墨纳米带的电导.研究发现,由于堆叠石墨片与石墨纳米带的耦合作用,锯齿型石墨纳米带的电导谱出现了电导谷.在远离费米能处,两种堆叠方式下的电导谷位置相近甚至重合;而在费米能附近,两种堆叠方式下的电导谷存在差异.此外,讨论了堆叠石墨片的几何尺寸对锯齿型石墨纳米带电子输运的影响.结果显示,随石墨片几何尺寸的增大,锯齿型石墨纳米带在两种堆叠方式下远离费米能处的电导谷逐渐向费米能方向移动,同时其费米能附近的电导谷在两种堆叠方式下的差异随石墨片尺寸的增大变得更为明显.研究结果表明,堆叠石墨片能够有效地调制锯齿型石墨纳米带的电子输运性质.
The effect of the stacking graphite sheets on the electron transport properties of zigzag graphite nanoribbons was investigated by Green’s function method and the conductances of the zigzag graphite nanoribbons were calculated under two different stacking conditions. , The conductance of the zigzag-type graphite nanoribbons appears in the conductance valley. At far away from the Fermi energy, the conductance valleys of the two stacking modes are similar or even coincide. In the vicinity of Fermi energy, the conductance of the two stacking modes In addition, the influence of the geometry of the stacked graphite sheets on the electron transport of the zigzag graphite nanobelts was discussed. The results show that with the increase of the geometric size of the graphite sheets, the zigzag graphite nanoribbons are far away from each other in both stacking modes The valley of the Fermi energy gradually moves towards the Fermi energy direction, and the difference of the valley of conduction valley near Fermi energy between the two stacking modes becomes more obvious with the increase of the size of the graphite sheet.The results show that the stacking Graphite sheet can effectively modulate the electron transport properties of zigzag graphite nanoribbons.