Ground-state reference systems for expanding correlated fermions in one dimension

Details Ground-state reference systems for expanding correlated fermions in one dimension Ground-state reference systems for expanding correlated fermions in one dimension

2008-01-29

arxiv.org/abs/0801.4454v3

Phys. Rev. A 78, 013620 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages Revtex4, 7 eps-figures, minor changes, additional references, as published

Scientific paper

10.1103/PhysRevA.78.013620

We study the sudden expansion of strongly correlated fermions in a one-dimensional lattice, utilizing the time-dependent density-matrix renormalization group method. Our focus is on the behavior of experimental observables such as the density, the momentum distribution function, and the density and spin structure factors. As our main result, we show that correlations in the transient regime can be accurately described by equilibrium reference systems. In addition, we find that the expansion from a Mott insulator produces distinctive peaks in the momentum distribution function at |k| ~ pi/2, accompanied by the onset of power-law correlations.

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