标题： CdHgTe在静水压力下的正太赫兹光电导性 显示英文标题

标题： Positive Terahertz Photoconductivity in CdHgTe Under Hydrostatic Pressure

摘要： 在不同镉含量的CdHgTe薄膜中，室温下观察到正的太赫兹光电导率。 我们表明，由类似德鲁德吸收引起的电子气加热导致正光电导率，这是未掺杂窄带隙半导体和半金属特有的带间激活机制的结果。 应用强太赫兹辐射时，我们观察到光电导率在高强度下趋于饱和，这被发现是由于吸收漂白造成的。 光电导率的大小和饱和强度都被证明与静水压力呈指数依赖关系。 我们表明，这是由于这两种现象都受能量弛豫时间和动量弛豫时间比值的控制。 显示英文摘要

摘要： Positive terahertz photoconductivity is observed at room temperature in CdHgTe thin films with different Cd contents. We show that electron gas heating caused by Drude-like absorption results in positive photoconductivity because of the interband activation mechanism specific for undoped narrow-gap semiconductors and semimetals. Applying intense terahertz radiation, we observed that the photoconductivity saturates at high intensities, which was found to be caused by absorption bleaching. Both the magnitude of the photoconductivity and the saturation intensity are shown to exhibit an exponential dependence on the hydrostatic pressure. We show that this is a consequence of the fact that both phenomena are controlled by the ratio of energy and momentum relaxation times.