GaAs/AlGaAs异质结中二维电子气的回旋共振研究  

STUDY ON CYCLOTRON RESONANCE OF TWO DIMENSIONAL ELECTRON GAS IN GaAs/AlGaAs HETEROJUNCTION

作　　者：陈张海[1,2] 胡灿明[1,2] 刘普霖[1,2] 史国良[1,2] 陆卫[1,2] 张波[1,2] 石晓红[1,2] 沈学础[1,2] 

机构地区：[1]中国科学院上海技术物理研究所 [2]中国科学院红外物理国家重点实验室

出　　处：《红外与毫米波学报》1997年第2期107-113,共7页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金

摘　　要：采用栅压比谱的方法，研究了ＧａＡｓ／ＡｌＧａＡｓ异质结中二维电子气（２ＤＥＧ）的回旋共振。观察到由于子能带－朗道能级耦合所引起的回旋共振峰强度随磁场的振荡行为．由回旋共振频率ωｃ确定了子能带电子的回旋共振有效质量ｍ＊，通过对共振峰线形的拟合，获得二维电子气浓度Ｎｓ、电子散射时间τ和迁移率μ．由子能带－朗道能级的共振耦合测量了不同栅压下的多个子能带间的能量间距．Cyclotron resonance (CR) of two dimensional electron gases (2DEG) in GaAs/AlGaAs heterojunction was studied by the gate voltage ratio spectrum measurement technique. The oscillation behavior of the intensity of the CR peaks with the magnetic field due to the resonant subband Landau level coupling was observed. The CR effective mass m * of the subband electrons was determined from the CR frequency ω c . The density of 2DEG N s ,electron scattering time τ and mobility μ were obtained by fitting the CR line shape. Several subband energies at different gate voltage were measured by the resonant subband Landau level coupling method. The influences of the conduction band nonparabolicity on the CR effective mass of electron were also discussed.

关 键 词：异质结 二维电子气 回旋共振 砷化镓 能带 

分 类 号：TN304.23[电子电信—物理电子学] O471.5[理学—半导体物理]