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arXiv 1302.4633physics.opticscond-mat.mes-hallcond-mat.other
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频率调制相干极化产生的全光感应电流

All-optically induced currents resulting from frequency modulated coherent polarization

Shekhar Priyadarshi, Klaus Pierz, Mark Bieler

摘要:

我们采用偏振成形的超快光脉冲来产生光电流,只有当光致相干偏振被频率调制时才会产生光电流。这种频率调制是通过(110)取向GaAs量子阱中光空穴激子的失谐激发获得的。所观察到的光电流消失的激子的共振激发和扭转其方向与失谐的符号的变化。此外,对于连续波激励,电流不存在。我们的工作揭示了一类新的光电流的存在,并可视化电流响应张量的复杂性。这有助于更好地理解半导体中的光致微观输运。

英文摘要:

We employ polarization-shaped ultrafast optical pulses to generate photocurrents which only arise if the optically induced coherent polarization is frequency modulated. This frequency modulation is obtained via detuned excitation of light-hole excitons in (110)-oriented GaAs quantum wells. The observed photocurrents vanish for resonant excitation of excitons and reverse their direction with a change of the sign of detuning. Moreover, the currents do not exist for continuous-wave excitation. Our work reveals the existence of a new class of photocurrents and visualizes the complexity of current response tensors. This is helpful for the better understanding of optically induced microscopic transport in semiconductors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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