Quasiparticle dynamics in a Bose insulator probed by interband Bragg spectroscopy
Authors: Fabbri N., Huber S. D., Clément D., Fallani L., Fort C., Inguscio M., Altman E.
Autors Affiliation: LENS, Dipartimento di Fisica e Astronomia, Università di Firenze and INO-CNR, via Nello Carrara 1, I-50019 Sesto Fiorentino (FI), Italy; Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot, 76100, Israel
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.
Journal/Review: PHYSICAL REVIEW LETTERS
Volume: 109 (5) Pages from: 055301 to: 055301
More Information: This work was supported by ISF, MAE-MIUR (Joint Laboratory LENS-Weizmann), ECR Firenze, by ERC through the DISQUA grant, and by MIUR through PRIN2009. S. D. H acknowledges support by the Swiss Society of Friends of the Weizmann Institute of Science.KeyWords: Angle resolved photoemission spectroscopy; Bragg spectroscopy; Dynamical properties; Excitation schemes; Inter-band transition; Interband; Mott insulators; Mott state; One-dimensional chains; Quantum fluctuation; Quasiparticle dynamics; Single-particle; Spectral function, Quantum electronics, Photoelectron spectroscopyDOI: 10.1103/PhysRevLett.109.055301Citations: 23data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2020-02-23References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here