Abstract

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 (>109excitons/cm2), we observe untilted peaks similar to those reported in previous experiments. At low excitation densities (<108excitons/cm2), 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.

© 2016 Optical Society of America

Full Article  |  PDF Article
More Like This
Quantifying spectral diffusion by the direct measurement of the correlation function for excitons in semiconductor quantum wells

Rohan Singh, Galan Moody, Mark E. Siemens, Hebin Li, and Steven T. Cundiff
J. Opt. Soc. Am. B 33(7) C137-C143 (2016)

Picosecond time-resolved far-infrared experiments on carriers and excitons in GaAs–AlGaAs multiple quantum wells

R. H. M. Groeneveld and D. Grischkowskyt
J. Opt. Soc. Am. B 11(12) 2502-2507 (1994)

Exciton–exciton interaction under elliptically polarized light excitation

D. Robart, T. Amand, X. Marie, M. Brousseau, J. Barrau, and G. Bacquet
J. Opt. Soc. Am. B 13(5) 1000-1008 (1996)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (6)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Metrics