title: Probing localization in absorbing systems via Loschmidt echos.
abstract: We measure Anderson localization in quasi-one-dimensional waveguides in the presence of absorption by analyzing the echo dynamics due to small perturbations. We specifically show that the inverse participation number of localized modes dictates the decay of the Loschmidt echo, differing from the Gaussian decay expected for diffusive or chaotic systems. Our theory, based on a random matrix modeling, agrees perfectly with scattering echo measurements on a quasi-one-dimensional microwave cavity filled with randomly distributed scatterers.
authors: Department of Physics, Wesleyan University, Middletown, Connecticut 06459, USA.
authors: Joshua D
authors: JD
authors: Bodyfelt
authors: Mei C
authors: MC
authors: Zheng
authors: Tsampikos
authors: T
authors: Kottos
authors: Ulrich
authors: U
authors: Kuhl
authors: Hans-Jürgen
authors: HJ
authors: Stöckmann