Highly sensitive and tunable detection of far-infrared radiation by quantum Hall devices
Highly sensitive and tunable detection of far-infrared radiation by quantum Hall devices
复制标题
量子霍尔器件对远红外辐射的高灵敏度和可调谐检测
DOI：
10.1063/1.1352685
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发表时间：
2001
影响因子：
3.2
通讯作者：
S. Komiyama
中科院分区：
文献类型：
--
作者：
Y. Kawano;Y. Hisanaga;H. Takenouchi;S. Komiyama
利用n-InSb器件的回旋辐射作为光源，研究了GaAs/AlGaAs异质结中二维电子气系统的回旋共振远红外响应。我们研究了FIR响应对不同实验参数的依赖性，包括霍尔条的纵横比、电子迁移率、偏置电流、光照强度、磁场和晶格温度。强的光响应仅出现在整数量子霍尔效应（IQHE）制度附近。时间分辨测量表明，激发态载流子的复合寿命在很大程度上取决于电子迁移率，在4.2K时，复合寿命为5 μs ~ 1 ms。光响应的时间衰减在高迁移率样品中是非指数的，而在低迁移率样品中是指数的，具有单个时间常数。这一点，加上相对较大的时间常数，表明FIR响应是通过多捕获过程，其中激发的汽车…
We studied far-infrared (FIR) response due to cyclotron resonance (CR) of two-dimensional electron gas systems in GaAs/AlGaAs heterostructures by using cyclotron radiation from n-InSb devices as the illumination source. We examined the dependence of the FIR response on different experimental parameters, including the aspect ratio of Hall bars, electron mobility, bias current, illumination intensity, magnetic field, and lattice temperature. A strong photoresponse emerges only in the vicinity of integer quantum Hall effect (IQHE) regimes. Time-resolved measurements show that the recombination lifetime of excited carriers depends largely on the electron mobility, ranging from 5 μs to 1 ms at 4.2 K. The temporal decay of photoresponse is nonexponential in higher-mobility samples, whereas it is exponential with a single time constant in lower-mobility samples. This, together with the relatively large time constants, suggests that the FIR response is induced through multitrapping processes, in which excited car...