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A: Atomphysik
A 15: Poster 2
A 15.27: Poster
Donnerstag, 25. März 2004, 14:00–16:00, Schellingstr. 3
Quasi-one-dimensional Bose and Femi gases under external confinement — •Doerte Blume1, Grigori Astrakharchik2, Stefano Giorgini2, and Brian Granger3 — 1Department of Physics, Washington State University, Pullman, Washington 99164-2814, USA — 2Dipartimento di Fisica, Universita di Trento and BEC-INFM, I-38050, Povo, Italy — 3Department of Physics, Santa Clara University, California 95053, USA
Bose gases confined in highly-elongated harmonic traps are investigated over a wide range of interaction strengths using quantum Monte Carlo techniques. We find that the properties of these gases are well reproduced by a 1d model Hamiltonian with contact interactions. We point out the existence of a unitary regime, where the properties of the quasi-1d Bose gas become independent of the actual value of the 3d scattering length. In this unitary regime, the energy of the system is well described by a hard rod equation of state. The stability of quasi-1d Boses gases with positive and negative 3d scattering length is discussed. We contrast the behaviors of quasi-1d Bose gases with those of quasi-1d two-component Fermi gases and quasi-1d spin-polarized Fermi gases.