Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 33, Issue 7, Pages -Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.33.00C108
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- Australian Research Council (ARC) [FT120100587]
- Australian Research Council [FT120100587] Funding Source: Australian Research Council
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We identify carrier scattering at densities below that which has previously been observed in semiconductor quantum wells. These effects are evident in the peak shapes of 2D double-quantum spectra, which change as a function of excitation density. At high excitation densities (>10(9) excitons/cm(2)), we observe untilted peaks similar to those reported in previous experiments. At low excitation densities (<10(8) excitons/cm(2)), we observe narrower tilted peaks. Using a simple simulation, we show that tilted peak shapes are expected in double-quantum spectra when inhomogeneous broadening is much larger than homogeneous broadening, and that fast pure-decoherence of the double-quantum coherence can obscure this peak tilt. These results show that carrier interactions are important at lower densities than previously expected, and that the natural double-quantum peak shapes are hidden by carrier interactions at the excitation densities typically used. Furthermore, these results demonstrate that analysis of 2D peak shapes in double-quantum spectroscopy provides an incisive tool for identifying interactions at low excitation density. (C) 2016 Optical Society of America
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