Work

Expansion Dynamics in the One-Dimensional Fermi-Hubbard Model

Year: 2011

Type: article

Abstract: Expansion dynamics of interacting fermions in a lattice is simulated within the one-dimensional (1D) Hubbard model, using the essentially exact time-evolving block decimation (TEBD) method. In particular, the expansion of an initial band-insulator state is considered. We analyze the simulation results based on the dynamics of a two-site two-particle system, the so-called Hubbard dimer. Our findings describe essential features of a recent experiment on the expansion of a Fermi gas in a two-dimensional lattice. We show that the Hubbard-dimer dynamics, combined with a two-fluid model for the paired and nonpaired components of the gas, gives an efficient description of the full dynamics. This should be useful for describing dynamical phenomena of strongly interacting Fermions in a lattice in general.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.106.206401

Authors: J. Kajala, F. Massel, P. Törmä

Institutions: Aalto University, University of California, Santa Barbara, Kavli Institute for Theoretical Physics

Language: English

Topic: Cold Atom Physics and Bose-Einstein Condensates

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: National Science Foundation, Academy of Finland, China Scholarship Council, FP7 Ideas: European Research Council

Awards: Mesoscopic heattronics: thermal and nonequilibrium effects and fluctuations in nanoelectronics, Kavli Institute for Theoretical Physics, G471671836, G4769088964