Particle number fractionization of an atomic Fermi-Dirac gas in an optical lattice

Details Particle number fractionization of an atomic Fermi-Dirac gas in an optical lattice Particle number fractionization of an atomic Fermi-Dirac gas in an optical lattice

2002-04-05

arxiv.org/abs/cond-mat/0204122v1

Phys.Rev.Lett. 88 (2002) 180401

Physics

Condensed Matter

4 pp, 1 figure; to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.88.180401

We show that a dilute 2-species gas of Fermi-Dirac alkali-metal atoms in a periodic optical lattice may exhibit fractionization of particle number when the two components are coupled via a coherent electromagnetic field with a topologically nontrivial phase profile. This results in fractional eigenvalues of the spin operator with vanishing fluctuations. The fractional part can be accurately controlled by modifying the effective detuning of the electromagnetic field.

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