title: Coherent excitonic coupling in an asymmetric double InGaAs quantum well arises from many-body effects.
abstract: We study an asymmetric double InGaAs quantum well using optical two-dimensional coherent spectroscopy. The collection of zero-quantum, one-quantum, and two-quantum two-dimensional spectra provides a unique and comprehensive picture of the double well coherent optical response. Coherent and incoherent contributions to the coupling between the two quantum well excitons are clearly separated. An excellent agreement with density matrix calculations reveals that coherent interwell coupling originates from many-body interactions.
authors.affiliation: JILA, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA.
authors.forename: Gaël
authors.initials: G
authors.lastname: Nardin
authors.affiliation: JILA, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA and Department of Physics, University of Colorado, Boulder, Colorado 80309-0390, USA.
authors.forename: Galan
authors.initials: G
authors.lastname: Moody
authors.affiliation: JILA, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA and Department of Physics, University of Colorado, Boulder, Colorado 80309-0390, USA.
authors.forename: Rohan
authors.initials: R
authors.lastname: Singh
authors.affiliation: JILA, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA and Department of Physics, University of Colorado, Boulder, Colorado 80309-0390, USA.
authors.forename: Travis M
authors.initials: TM
authors.lastname: Autry
authors.affiliation: JILA, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA.
authors.forename: Hebin
authors.initials: H
authors.lastname: Li
authors.affiliation: Laboratory of Quantum Optoelectronics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
authors.forename: François
authors.initials: F
authors.lastname: Morier-Genoud
authors.affiliation: JILA, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA and Department of Physics, University of Colorado, Boulder, Colorado 80309-0390, USA.
authors.forename: Steven T
authors.initials: ST
authors.lastname: Cundiff