Mid/far-infrared photo-detectors based on graphene asymmetric quantum wells  

作　　者：E Ben Salem R Chaabani S Jaziri 

机构地区：[1]Institut Preparatoire aux Etudes d'Ingenieurs de Tunis, 2, Rue Jawaher Lel Nahrou Monfleury 1089, Tunisie [2]Laboratoire de Physique de la Matiere Condensee, Departement de Physique, Faculte des Sciences de Tunis, Campus Universitaire 2092, Tunisie [3]Departement de Physique, Faculte des Sciences de Bizerte, Jarzouna 7021, Bizerte

出　　处：《Chinese Physics B》2016年第9期573-580,共8页中国物理B（英文版）

摘　　要：We conducted a theoretical study on the electronic properties of a single-layer graphene asymmetric quantum well.Quantification of energy levels is limited by electron–hole conversion at the barrier interfaces and free-electron continuum.Electron–hole conversion at the barrier interfaces can be controlled by introducing an asymmetry between barriers and taking into account the effect of the interactions of the graphene sheet with the substrate.The interaction with the substrate induces an effective mass to carriers,allowing observation of Fabry–P′erot resonances under normal incidence and extinction of Klein tunneling.The asymmetry,between barriers creates a transmission gap between confined states and free-electron continuum,allowing the large graphene asymmetric quantum well to be exploited as a photo-detector operating at mid-and far-infrared frequency regimes.We conducted a theoretical study on the electronic properties of a single-layer graphene asymmetric quantum well.Quantification of energy levels is limited by electron–hole conversion at the barrier interfaces and free-electron continuum.Electron–hole conversion at the barrier interfaces can be controlled by introducing an asymmetry between barriers and taking into account the effect of the interactions of the graphene sheet with the substrate.The interaction with the substrate induces an effective mass to carriers,allowing observation of Fabry–P′erot resonances under normal incidence and extinction of Klein tunneling.The asymmetry,between barriers creates a transmission gap between confined states and free-electron continuum,allowing the large graphene asymmetric quantum well to be exploited as a photo-detector operating at mid-and far-infrared frequency regimes.

关 键 词：graphene quantum wells reflection coefficient photo-detector 

分 类 号：TN15[电子电信—物理电子学] O613.71[理学—无机化学]