Particle-Hole Pair Coherence in Mott Insulator Quench Dynamics

Abstract

We predict the existence of novel collapse and revival oscillations that are a distinctive signature of the short-range off-diagonal coherence associated with particle-hole pairs in Mott insulator states. Starting with an atomic Mott state in a one-dimensional optical lattice, suddenly raising the lattice depth freezes the particle-hole pairs in place and induces phase oscillations. The peak of the quasi-momentum distribution, revealed through time of flight interference, oscillates between a maximum occupation at zero quasi-momentum (the $\Gamma$ point) and the edge of the Brillouin zone. We show that the population enhancements at the edge of the Brillouin zone is due to coherent particle-hole pairs, and we find similar effects for fermions and Bose-Fermi mixtures in a lattice. Our results open a new avenue for probing strongly correlated many-body states with short-range phase coherence that goes beyond the familiar collapse and revivals previously observed in the long-range coherent superfluid regime.

7 pages including Supplementary Material, 5 figures

References in corpus (15)

• Many-Body Physics with Ultracold Gases
• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Thermalization and its mechanism for generic isolated quantum systems
• Classical simulation of infinite-size quantum lattice systems in one spatial dimension
• Quench dynamics and non equilibrium phase diagram of the Bose-Hubbard model
• Mixtures of Bosonic and Fermionic Atoms in Optical Lattices
• Preparing and probing atomic number states with an atom interferometer
• Interference pattern and visibility of a Mott insulator
• Sweeping from the superfluid to Mott phase in the Bose-Hubbard model
• Comparing and contrasting nuclei and cold atomic gases
• Scaling of the gap, fidelity susceptibility, and Bloch oscillations across the superfluid to Mott insulator transition in the one-dimensional Bose-Hubbard model
• Coherent Interaction of a Single Fermion with a Small Bosonic Field
• Dynamics of the particle - hole pair creation in graphene
• Accurate determination of the superfluid-insulator transition in the one-dimensional Bose-Hubbard model
• Particle-Hole Pair Coherence in Mott Insulator Quench Dynamics

Cited by in corpus (5)

• Negative quench induced excitation dynamics for ultracold bosons in one-dimensional lattices
• Quench-induced resonant tunneling mechanisms of bosons in an optical lattice with harmonic confinement
• Observation of coherent quench dynamics in a metallic many-body state of fermionic atoms
• Contour-time approach to the Bose-Hubbard model in the strong coupling regime: Studying two-point spatio-temporal correlations at the Hartree-Fock-Bogoliubov level
• Particle-Hole Pair Coherence in Mott Insulator Quench Dynamics