| Autor: |
Priyadarshi, Shekhar, Pierz, Klaus, Bieler, Mark |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
Appl. Phys. Lett. 102, 112102 (2013) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1063/1.4795722 |
| Popis: |
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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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