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Investigation on Semiconductor Physics at Very Low Temperature Using Laser Light as a Probe

以激光为探针的极低温半导体物理研究

基本信息

批准号：
07454092
负责人：
SAKURAI Katsumi
金额：
$ 4.54万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

In present day, all laser diodes with quantum well structure have the perfect quality of crystal. So laser chip itself is the best sample for study on solid state quantum physics. This study aims to investigate physics in semiconductor laserr at very low temperature and under magnetic field using output laser light as a probe for inside of laser materials. We expect new phenomena and new physics in a quantum well doide laser under high magnetic field as new interacting system between radiation and quantum transport in low dimension materialWe found new resonance feather in the output of quantum well diode laser driven with constant current at He temperature, while the applied magnetic filed scanned from 0 to 5 Tesla. Almost of all of AlGaInP quantum well lasaer shows this resonance at 0.3-0.4 Tesla where the cyclotron resonance frequncy is very close to cavity spacing of semi-conductor laser. The width of resonance is 0.1-0.15 Tesla at 4 K and its peak is getting lower and its width is … More getting broader as temperature increases. Finally, this resonance disapperars about 20K.The cyclotron motion is confined in the plane of junction due quantum well structure. The polarization of difference frequency between multi-mode oscillation by nonlinear effect is parallel to junction plane. We observed the dependence of reonance peak on the angle between magnetic filed and junction plane. Since its dependence is consistent with theory, we had concluded that this resonance was due to mode locking phenomena of multi-mode oscillation through cyclotron resonance. However, very recently, we found that this kind of resonance is observed below laser oscillation as well as in laser diode under optical excitation. By this observation, the interpretation by mode locking of multi-mode oscillation by cyclotron resonance has been completely denied. We have found another strange resonance with magnetic field in voltage across diode laser driven by constant current. At this stage we do not know the mechanism of two interesting resonance of quantum well laser with magnetic field. We are doing hard experiments to investigate these interesting phenomena. Less

目前，所有量子阱结构的激光二极管都具有理想的晶体质量。因此，激光器芯片本身就是研究固态量子物理的最佳样品。本研究的目的是利用输出激光作为探测激光材料内部的探针，在极低温度和磁场下研究半导体激光器的物理。我们期待着在强磁场下量子阱二极管激光器作为低维材料中辐射与量子输运相互作用的新系统中出现新的现象和新的物理现象。我们在He温度下恒流驱动的量子阱二极管激光器的输出中发现了新的共振特征，当外加磁场从0到5特斯拉扫描时。几乎所有的AlGaInP量子阱激光器都在0.3-0.4特斯拉处出现了这种共振，其回旋共振频率与半导体激光器的腔间距非常接近。在4K时，共振宽度为0.1-0.15特斯拉，峰值逐渐降低，宽度逐渐减小 ...更多信息随着温度的升高而变宽。由于量子阱结构，回旋运动被限制在结平面内。非线性效应引起的多模振荡的差频极化方向平行于结面。我们观察到共振峰随磁场与结面夹角的变化。由于它的依赖性与理论一致，我们得出结论，这种共振是由于通过回旋共振的多模振荡的锁模现象。然而，最近，我们发现，这种共振观察到低于激光振荡以及在激光二极管在光激发下。通过这一观察，回旋共振多模振荡的锁模解释已被完全否定。在恒流驱动的半导体激光器两端的电压中发现了另一种与磁场的奇异共振现象。目前我们还不知道量子阱激光器与磁场发生两种有趣共振的机理。我们正在做艰苦的实验来研究这些有趣的现象。少