arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1609.03709cond-mat.mes-hall
收藏

等离子体倏逝场诱导本征石墨烯的大光子拖曳效应

Large photon drag effect of intrinsic graphene induced by plasmonic evanescent field

Ma Luo, Zhibing Li

摘要:

在等离子体层上石墨烯系统中,预测了无质量狄拉克费米子在本征石墨烯中的大光子拖曳效应。等离激元层中的表面等离激元使光子的波数增大了数百倍。表面等离子体激元的倏逝场在本征石墨烯中产生载流子的定向运动,因为从表面等离子体激元到激发的载流子的大的动量转移。假设表面等离子体激元的面内波长远小于载流子的平均自由程,建立了一个模型哈密顿量。采用摄动法和数值积分相结合的方法求解密度矩阵的时间演化。非对角密度矩阵元素与动量转移导致规范电流,这是光学驱动的宏观直流。研究了激光场入射方向和强度对宏观直流电流的影响。

英文摘要:

Large photon drag effect of the massless Dirac Fermions in intrinsic graphene is predicted for a graphene-on-plasmonic-layer system. The surface plasmons in the plasmonic layer enlarge the wave number of photon for hundreds of time of that in vacuum. The evanescent field of the surface plasmons generates directional motion of carriers in the intrinsic graphene, because of the large momentum transfer from the surface plasmon to the excited carriers. A model Hamiltonian is developed on the assumption that the in-plane wavelength of the surface plasmons is much smaller than the mean free path of the carriers. The time evolution of density matrix is solved by perturbation method as well as numerical integration. The non-diagonal density matrix elements with momentum transfer lead to gauge current that is the optically driven macroscopic direct current. The dependence of the macroscopic direct current on the incident direction and intensity of the laser field is studied.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑