Quasiparticle dynamics in a Bose insulator probed by interband Bragg spectroscopy

Year: 2012

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 spectroscopy
DOI: 10.1103/PhysRevLett.109.055301

Citations: 30
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