Interaction-Controlled Transport of an Ultracold Fermi Gas

2007/07/31 by Niels Strohmaier, Yosuke Takasu, Kenneth Günter +4 · 5 citations
Physics and Astronomy · #Atomic and Subatomic Physics Research #Atomic physics #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Electron #Fermi Gamma-ray Space Telescope #Fermi gas #Nuclear physics #Physics #Quantum #Quantum mechanics #Quantum, superfluid, helium dynamics #Ultracold atom #cond-mat.str-el #quant-ph

paper · pdf · doi:10.1103/physrevlett.99.220601

published as Phys. Rev. Lett. 99, 220601 (2007) · 4 pages, 4 Postscript figures

openalex publication_date 2007/11/28 · arxiv created 2007/12/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We explore the transport properties of an interacting Fermi gas in a three-dimensional optical lattice. The center of mass dynamics of the atoms after a sudden displacement of the trap minimum is monitored for different interaction strengths and lattice fillings. With increasingly strong attractive interactions the weakly damped oscillation, observed for the noninteracting case, turns into a slow relaxational drift. Tuning the interaction strength during the evolution allows us to dynamically control the transport behavior. Strong attraction between the atoms leads to the formation of local pairs with a reduced tunneling rate. The interpretation in terms of pair formation is supported by a measurement of the number of doubly occupied lattice sites. This quantity also allows us to determine the temperature of the noninteracting gas in the lattice to be as low as (27+/-2)% of the Fermi temperature.

Citations

• Mean-field treatment of the damping of the oscillations of a one-dimensional Bose gas in an optical lattice
• Transition from a Strongly Interacting 1D Superfluid to a Mott Insulator
• Path integral formulation of the tunneling dynamics of a superfluid Fermi gas in an optical potential
• High-Temperature Superfluidity of Fermionic Atoms in Optical Lattices
• Collisionally Induced Transport in Periodic Potentials
• Insulating Behavior of a Trapped Ideal Fermi Gas
• Observation of resonance condensation of fermionic atom pairs
• Signature of Mott-Insulator Transition with Ultracold Fermions in a One-Dimensional Optical Lattice
• Superfluid-Insulator Transition in a Moving System of Interacting Bosons
• Vortices and superfluidity in a strongly interacting Fermi gas

Cited by

• Dynamical Arrest of Ultracold Lattice Fermions
• Controlling transport of ultracold atoms in one-dimensional optical lattices with artificial gauge fields
• Rigorous mean-field dynamics of lattice bosons: Quenches from the Mott insulator
• Resonantly enhanced tunneling and transport of ultracold atoms on tilted optical lattices
• η-pairing in correlated fermion models with spin-orbit coupling

Related

• Observation of Elastic Doublon Decay in the Fermi-Hubbard Model
• Transport of ultracold dipolar fermions in one-dimensional optical lattices
• Band and Correlated Insulators of Cold Fermions in a Mesoscopic Lattice
• Slow Mass Transport and Statistical Evolution of an Atomic Gas across the Superfluid–Mott-Insulator Transition
• Dissipative Dynamics Of Fermion-Fermion Scattering In A Three-Site Optical Lattice