Quasiparticle dynamics in a bose insulator probed by interband bragg spectroscopy

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 func...

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Veröffentlicht in:Physical review letters 2012-07, Vol.109 (5), p.055301-055301, Article 055301
Hauptverfasser: Fabbri, N, Huber, S D, Clément, D, Fallani, L, Fort, C, Inguscio, M, Altman, E
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Sprache:eng
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Zusammenfassung: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.109.055301