title: Comment on "origin of giant optical nonlinearity in charge-transfer-mott insulators: a new paradigm for nonlinear optics".
authors.affiliation: Department of Physics University of Arizona Tucson, Arizona 85721, USA.
authors.forename: R T
authors.initials: RT
authors.lastname: Clay
authors.forename: S
authors.initials: S
authors.lastname: Mazumdar