title: Evidence for intervalence band coherences in semiconductor quantum wells via coherently coupled optical Stark shifts.
abstract: We report the experimental observation of coherently coupled heavy-hole-light-hole Stark shifts, i.e., light-hole exciton shifts under heavy-hole exciton pumping conditions, in InGaAs quantum wells. The theoretical analysis of the data is based on a full many-body approach (dynamics-controlled truncation formalism) in the third-order nonlinear optical regime. It is shown that the Stark shift data can be interpreted as strong evidence of suitably defined nonradiative intervalence band coherences in a semiconductor quantum well. Hence, the observations establish a semiconductor analog of Raman coherences in three-level atoms.
authors.affiliation: Optical Sciences Center, University of Arizona, Tucson, Arizona 85721.
authors.forename: M E
authors.initials: ME
authors.lastname: Donovan
authors.forename: A
authors.initials: A
authors.lastname: Schülzgen
authors.forename: J
authors.initials: J
authors.lastname: Lee
authors.forename: P A
authors.initials: PA
authors.lastname: Blanche
authors.forename: N
authors.initials: N
authors.lastname: Peyghambarian
authors.forename: G
authors.initials: G
authors.lastname: Khitrova
authors.forename: H M
authors.initials: HM
authors.lastname: Gibbs
authors.forename: I
authors.initials: I
authors.lastname: Rumyantsev
authors.forename: N H
authors.initials: NH
authors.lastname: Kwong
authors.forename: R
authors.initials: R
authors.lastname: Takayama
authors.forename: Z S
authors.initials: ZS
authors.lastname: Yang
authors.forename: R
authors.initials: R
authors.lastname: Binder