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arXiv 1411.0102cond-mat.mes-hallcond-mat.mtrl-sci
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碳纳米管中光注入电流的动力学

Dynamics of optically injected currents in carbon nanotubes

L. L. Bonilla, M. Alvaro, M. Carretero, E. Ya. Sherman

摘要:

我们从理论上考虑了光注入碳纳米管的电流的动力学。虽然在这些系统中没有看到等离子体振荡,但对载流子运动的主要影响是由于注入的电子和空穴密度随时间变化的分离产生的强烈的非均匀空间电荷库仑力。我们计算的偶极矩的演变特征的时间和坐标相关的电荷密度分布和分析不同的制度的动态。所开发的依赖于时间的偶极矩导致在太赫兹频率范围内的偶极辐射的典型参数的注入电流。

英文摘要:

We consider theoretically the dynamics of electric currents optically injected in carbon nanotubes. Although the plasma oscillations are not seen in these systems, the main effect on the carrier's motion is due to strongly nonuniform space-charge Coulomb forces produced by time-dependent separation of injected electron and hole densities. We calculate evolution of the dipole moment characterizing the time- and coordinate-dependent charge density distributions and analyze different regimes of the dynamics. The developed time-dependent dipole moment leads to a dipole radiation in the THz frequency range for typical parameters of injected currents.

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