Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3249611
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- Deutsche Forschungsgemeinschaft
- Braunschweig International Graduate School of Metrology
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We report the observation and the study of an additional shift current tensor element in (110)-oriented GaAs quantum wells, which arises from an out-of-plane asymmetry of the quantum well structure. The current resulting from this tensor element is optically induced with 150 fs laser pulses and detected by measuring the simultaneously emitted terahertz radiation. This terahertz spectroscopy of shift currents is a powerful technique for symmetry investigations, which shows, for example, that our nominally symmetric (110)-oriented GaAs/AlGaAs quantum wells grown by molecular beam epitaxy are in reality asymmetric structures with different right and left interfaces. (C) 2009 American Institute of Physics. [doi:10.1063/1.3249611]
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