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学术报告:Exchange, correlation, and scattering effects on surface plasmons in armchair graphene nanoribbons

报告题目:Exchange, correlation, and scattering effects on surface plasmons in armchair graphene nanoribbons

报 告 人: P.Vasilopoulos教授 (加拿大Concordia大学)

报告地点: 致远楼213

报告时间:20171123日星期四 下午4:00

摘要:Using Maxwell’s equations for the incoming and outgoing electromagnetic field, in interaction with a metallic armchair graphene nanoribbon (AGNR), and the relationship between the density-density response function and the conductivity, we study surface plasmons (SPs) in a AGNR following the Lindhard, random-phase approximation, and Hubbard approaches. For transverse magnetic (TM) modes we obtain analytical dispersion relations (DRs) valid for q  kF and assess their width dependence. In all approaches we include screening. In the long-wavelength limit q  0 there is a small but noticeable difference between the DRs of the three approaches. In this limit the respective, scattering-free conductivities differ drastically from those obtained when scattering by impurities is included. We demonstrate that the SP field is proportional to the square of the quality factor Q. The reflection amplitude shows that metallic AGNRs do not support neither Brewster angles nor transverse electric (TE) SPs.

报告人简介:Dr. P. Vasilopoulos 现为加拿大蒙特利尔Concordia大学物理学教授。1972年本科毕业于希腊Thessaloniki大学,1979年于加拿大Concordia大学获硕士学位,1982年于蒙特利尔大学获博士学位。1982-1984年于德国斯图加特马普所及1984-1987年于蒙特利尔大学做博士后。

1987-1990年于蒙特利尔工业大学及1991-1992年于Concordia大学任职研究员。1992-1999年为Concordia大学副教授,1999年至今为Concordia大学教授。Vasilopoulos教授长期从事半导体微纳结构电子输运理论研究。

现已在PRLNano LettersAPL, PRB 等期刊发表学术论文230多篇。论文被引用5500多次,H因子38

  


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