title: Quasiparticle dynamics in a bose insulator probed by interband bragg spectroscopy.
abstract: We investigate experimentally and theoretically the dynamical properties of a Mott insulator in decoupled one-dimensional chains. Using a theoretical analysis of the Bragg excitation scheme, we show that the spectrum of interband transitions holds information on the single-particle Green's function of the insulator. In particular, the existence of particle-hole coherence due to quantum fluctuations in the Mott state is clearly seen in the Bragg spectra and quantified. Finally, we propose a scheme to directly measure the full, momentum-resolved spectral function as obtained in the angle-resolved photoemission spectroscopy of solids.
authors.affiliation: LENS, Dipartimento di Fisica e Astronomia, Università di Firenze, Sesto Fiorentino, Italy. fabbri@lens.unifi.it
authors.forename: N
authors.initials: N
authors.lastname: Fabbri
authors.forename: S D
authors.initials: SD
authors.lastname: Huber
authors.forename: D
authors.initials: D
authors.lastname: Clément
authors.forename: L
authors.initials: L
authors.lastname: Fallani
authors.forename: C
authors.initials: C
authors.lastname: Fort
authors.forename: M
authors.initials: M
authors.lastname: Inguscio
authors.forename: E
authors.initials: E
authors.lastname: Altman