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arXiv · 1109.1241

Quasiparticle dynamics in a Bose insulator probed by inter-band Bragg spectroscopy

Nicole Fabbri·Sebastian D. Huber·David Clément·Leonardo Fallani·Chiara Fort·Massimo Inguscio·Ehud Altman
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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 inter-band 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 angle-resolved photoemission spectroscopy of solids.

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Nicole Fabbri, Sebastian D. Huber, David Clément, Leonardo Fallani, Chiara Fort, Massimo Inguscio, Ehud Altman. 2011-09-06. Quasiparticle dynamics in a Bose insulator probed by inter-band Bragg spectroscopy. https://doi.org/10.1103/physrevlett.109.055301

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