Momentum-dependent pseudo-spin dimers of coherently coupled bosons in optical lattices
Authors: Menotti C., Minganti F., Recati A.
Autors Affiliation: INO-CNR BEC Center and Dipartimento di Fisica, Universita` di Trento, 38123 Povo, Italy
Ecole Normale Sup ́erieure, International Center of Fundamental Physics, Department of Physics, 24 rue Lhomond, F75005 Paris, France
Technische Universita ̈t Mu ̈nchen, James-Franck-Straße 1, 85748 Garching, Germany
Abstract: We study the two-body bound and scattering states of two particles in a one dimensional optical lattice in the presence of a coherent coupling between two internal atomic levels. Due to the interplay between periodic potential, interactions and coherent coupling, the internal structure of the bound states depends on their center of mass momentum. This phenomenon corresponds to an effective momentum-dependent magnetic field for the dimer pseudo-spin, which could be observed in a chirping of the precession frequency during Bloch oscillations. The essence of this effect can be easily interpreted in terms of an effective bound state Hamiltonian. Moreover for indistinguishable bosons, the two-body eigenstates can present simultaneously attractive and repulsive bound-state nature or even bound and scattering properties.
Journal/Review: PHYSICAL REVIEW A
Volume: 93 Pages from: 033602-1 to: 033602-11
KeyWords: Repulsive Bound Pairs; Coherently Coupled Gases;