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Expansion velocity of a one-dimensional, two-component Fermi gas during the sudden expansion in the ballistic regime
- Source :
- Phys. Rev. A 85, 043618 (2012)
- Publication Year :
- 2011
-
Abstract
- We show that in the sudden expansion of a spin-balanced two-component Fermi gas into an empty optical lattice induced by releasing particles from a trap, over a wide parameter regime, the radius $R_n$ of the particle cloud grows linearly in time. This allow us to define the expansion velocity $V_{ex}$ from $R_n=V_{ex}t$. The goal of this work is to clarify the dependence of the expansion velocity on the initial conditions which we establish from time-dependent density matrix renormalization group simulations, both for a box trap and a harmonic trap. As a prominent result, the presence of a Mott-insulating region leaves clear fingerprints in the expansion velocity. Our predictions can be verified in experiments with ultra-cold atoms.<br />Comment: 8 pages 10 figures, version as published with minor stylistic changes
- Subjects :
- Condensed Matter - Strongly Correlated Electrons
Condensed Matter - Quantum Gases
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. A 85, 043618 (2012)
- Publication Type :
- Report
- Accession number :
- edsarx.1109.4364
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevA.85.043618