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，所有具有量子阱结构的激光二极管都具有完美的晶体质量，因此激光芯片本身是研究固态量子物理的最佳样本。本研究旨在研究极低温和磁性下的半导体激光物理。使用输出激光作为激光材料内部的探针我们期望高磁场下量子阱激光器中的新现象和新物理作为低维材料中辐射和量子传输之间的新相互作用系统我们在低维材料中发现了新的共振羽毛。恒定电流驱动的量子阱二极管激光器的输出当施加的磁场从 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 特斯拉处显示出这种共振，其中回旋共振频率非常接近半导体激光器的腔间距。 4 K 时的共振强度为 0.1-0.15 特斯拉，随着温度的升高，其峰值越来越低，宽度越来越宽，最后，这种共振消失了。 20K.由于量子阱结构，回旋加速器运动被限制在结面内，非线性效应导致的多模振荡之间的差频极化平行于结面。我们观察到共振峰对磁场与结面之间的角度的依赖性。由于其依赖性与理论一致，我们得出结论，这种共振是由于回旋共振的多模振荡现象引起的，但是最近，我们发现这种共振是在激光下方观察到的。通过这一观察，回旋共振对多模振荡的锁模解释已被完全否定，我们发现了另一种奇怪的与恒定驱动的二极管激光器上的磁场的共振。目前，我们还不知道量子阱激光器与磁场的两种有趣的共振机制。我们正在做艰苦的实验来研究这些有趣的现象。