Quasiparticle Dynamics in a Bose Insulator Probed by Interband Bragg Spectroscopy

2011/09/30 by Nicole Fabbri, Sebastian D. Huber, David Clément +7 · 3 citations
Physics and Astronomy · #Coherence (philosophical gambling strategy) #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Excitation #Mott insulator #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum, superfluid, helium dynamics #Quasiparticle #Spectral line #Spectroscopy #cond-mat.quant-gas #quant-ph

paper · pdf · doi:10.1103/physrevlett.109.055301

published as Phys. Rev. Lett., 109 055301 (2012) · The new version contains improved theoretical treatment and data analysis

arxiv created 2012/05/04 · openalex publication_date 2012/07/31 · arxiv updated 2014/06/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

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.

Citations

• Angle-resolved photoemission studies of the cuprate superconductors
• Transition from a Strongly Interacting 1D Superfluid to a Mott Insulator
• Oscillating Superfluidity of Bosons in Optical Lattices
• Multiband Spectroscopy of Ultracold Fermions: Observation of Reduced Tunneling in Attractive Bose-Fermi Mixtures
• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Condensate Fraction in a 2D Bose Gas Measured across the Mott-Insulator Transition
• Measuring the One-Particle Excitations of Ultracold Fermionic Atoms by Stimulated Raman Spectroscopy
• Probing the Superfluid to Mott Insulator Transition at the Single Atom Level
• Dynamical properties of ultracold bosons in an optical lattice
• Spatial quantum noise interferometry in expanding ultracold atom clouds

Cited by

• Finding the phase diagram of strongly correlated disordered bosons using quantum quenches
• Matter-wave scattering from interacting bosons in an optical lattice
• Energy and momentum transfer in one-dimensional trapped gases by stimulated light scattering