Byungmoon Cho

TL;DR: Arguments based on carrier scattering length, the wave packet size supported by the band structure, and effective mass are advanced to support the hypothesis that, for many direct-gap semiconductor quantum dots, the carrier dynamics at three times the band gap is localized on the 1-2 nm length scale and essentially bulklike except for frequent collisions with the surface.

TL;DR: It is shown that the absorption bandgap inhomogeneity is robustly determined by the slope of the nodal line separating positive and negative peaks in the 2D spectrum around the bandgap transition; this nodsal line slope is independent of excited state parameters not known from the absorption and emission spectra.

TL;DR: Four-level two-dimensional Fourier transform relaxation spectra are simulated with response functions for a chromophore pair in the exponential relaxation (optical Bloch model) limit to reduce error in the distorted 2D spectrum by a factor of 4 for practical 2D-IR experimental conditions.

TL;DR: An intrinsically phase-stable Sagnac interferometer is introduced for optimized interferometric detection in partially collinear two-dimensional (2D) spectroscopy of IR-26 dye.

TL;DR: The absolute femtosecond pump-probe signal strength of deprotonated fluorescein in basic methanol is measured and matches the measurement to within 10% error without any adjustable parameters, demonstrating quantitative measurement of absolute excited state population.