Optically induced coherent intraband dynamics in disordered semiconductors
Optically induced coherent intraband dynamics in disordered semiconductors
复制标题
无序半导体中的光致相干带内动力学
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
Hungary.
中科院分区：
文献类型：
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作者：
C. Schlichenmaier;I. Varga;T. Meier;P. Thomas;S. Marburg;H Germany;Budapest University of Technology;Economics;Hungary.
基于具有相关导带和价带无序的强无序半导体的紧束缚模型，分析了相干动态带内效应。对于由两个专门设计的超短光脉冲序列激发的系统，相对于彼此延迟$ensuremath{au}$，预计会发生类似回声的现象。除了相对于第一个脉冲恰好在 $t=2ensuremath{au}$ 处出现的带间光子回波之外，系统还以在光子回波出现之前和之后的两个自发带内电流脉冲进行响应。时间分裂取决于电子-空穴质量比。通过计算库仑散射引起的布居弛豫率，得出的结论是，预测的新动力学效应应该在相互作用的强无序系统（例如量子库仑玻璃）中通过实验观察到。
On the basis of a tight-binding model for a strongly disordered semiconductor with correlated conduction- and valence-band disorder a coherent dynamical intraband effect is analyzed. For systems that are excited by two specially designed ultrashort light-pulse sequences delayed by $ensuremath{ au}$ relatively to each other echolike phenomena are predicted to occur. In addition to the interband photon echo which shows up at exactly $t=2ensuremath{ au}$ relative to the first pulse, the system responds with two spontaneous intraband current pulses preceding and following the appearance of the photon echo. The temporal splitting depends on the electron-hole mass ratio. Calculating the population relaxation rate due to Coulomb scattering, it is concluded that the predicted new dynamical effect should be experimentally observable in an interacting and strongly disordered system, such as the Quantum Coulomb Glass.