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我们曾报导过适当加压的Ge中,可能产生单个的电子空穴-液滴(drop),其半径Υ(?)200μm,寿命τ(?)300到600μS,并把它们叫做Υ液滴,以区别于通常在未加压的Ge中观察到的小液滴。小液滴的Υ(?)5μm,τ(?)40μS。由于加压时,电子-空穴液的密度n减少,Υ-液滴的寿命较长从发光线宽度的测量中得到n减少三倍。因为密度下降,Υ-液滴的无辐射衰减也减少了。液滴尺寸大的原因是不均匀的应力梯度使激子受力聚合到晶体中应力最大和能量最小的区域。把液滴象放大,扫过单色仪的狭
We have reported that properly pressurized Ge may produce a single electron-hole drop with a radius of 200 μm and a lifetime τ of 300 to 600 μs and call them Υ droplets, To distinguish from the small droplets normally observed in un-pressurized Ge. The small droplets of γ (?) 5μm, τ (?) 40μS. As the density of the electron-hole liquid decreases due to pressurization, the longer lifetime of the liquid droplets reduces the n by a factor of three from the measurement of the luminous line width. Because of the decrease in density, there is also a reduction in the non-radiative attenuation of the Υ-droplet. The reason for the large droplet size is that an inhomogeneous stress gradient causes the exciton to aggregate to the areas of the crystal that have the highest stress and the least energy. Enlarge the droplet as it sweeps across the monochromator