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The Journal of Chemical Physics

Three-dimensional electronic spectroscopy of excitons in GaAs quantum wells

Daniel B. Turner, Katherine W. Stone, Kenan Gündoğdu, Keith Adam Nelson

Published Oct 13, 2009• 98 citations

Abstract

We demonstrate three-dimensional (3D) electronic Fourier transform spectroscopy of GaAs quantum wells using four fully phase-coherent, noncollinear optical fields. Since the full complex signal field is measured as a function of all three time intervals, nearly every peak in the resulting 3D spectral solid arises from a distinguishable sequence of transitions represented by a single Feynman pathway. We use the 3D spectral peaks to separate two pathways involving weakly bound mixed biexcitons generated in different time orders. In the process, we reveal a peak that was previously obscured by a correlated but unbound exciton pair coherence. We also demonstrate a calibration procedure for the carrier frequency which yields biexciton binding energy values with high accuracy.

DOI: 10.1063/1.3245964

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