title: Two-quantum many-body coherences in two-dimensional fourier-transform spectra of exciton resonances in semiconductor quantum wells.
abstract: We present experimental coherent two-dimensional Fourier-transform spectra of Wannier exciton resonances in semiconductor quantum wells generated by a pulse sequence that isolates two-quantum coherences. By measuring the real part of the signals, we determine that the spectra are dominated by two-quantum coherences due to mean-field many-body interactions, rather than bound biexcitons. Simulations performed using dynamics controlled truncation agree with the experiments.
authors.affiliation: JILA, National Institute of Standards and Technology and University of Colorado, Boulder, Colorado 80309-0440, USA.
authors.forename: Denis
authors.initials: D
authors.lastname: Karaiskaj
authors.forename: Alan D
authors.initials: AD
authors.lastname: Bristow
authors.forename: Lijun
authors.initials: L
authors.lastname: Yang
authors.forename: Xingcan
authors.initials: X
authors.lastname: Dai
authors.forename: Richard P
authors.initials: RP
authors.lastname: Mirin
authors.forename: Shaul
authors.initials: S
authors.lastname: Mukamel
authors.forename: Steven T
authors.initials: ST
authors.lastname: Cundiff