J. Phys. Soc. Jpn. 77 (2008) 054301 (3 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Mott Plateau in Trapped Bose–Fermi Mixture

Akiko Masaki, Sota Tsukada, and Hiroyuki Mori

(Received December 23, 2007; Accepted March 4, 2008; Published April 25, 2008)

Boson–fermion mixture confined on an optical lattice is numerically studied. Mott-plateau like behavior is observed under certain conditions in the density profile of the bosons and fermions as one sees in bosonic atoms in a trap potential. In the Mott plateau area, the total number of the bosons and fermions at each site is kept to an integer value but both local density of the bosons and that of the fermions take some intermediate values. Unlike bosonic or fermionic Mott insulators, the bosons and fermions can move even in the Mott plateau area by exchanging their positions. With Monte Carlo simulations we demonstrate the formation of the Mott plateau, examine the property of the bosons and fermions by measuring the densities and local density fluctuations, and give discussion on this rather new state. ©2008 The Physical Society of Japan

KEYWORDS: ultra-cold atomic gases, Mott transition, optical lattice, fermion–boson mixture
URL: http://jpsj.ipap.jp/link?JPSJ/77/054301/
DOI: 10.1143/JPSJ.77.054301

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