Scientific Results

Rabi-Josephson oscillations and self-trapped dynamics in atomic junctions with two bosonic species

Year: 2011

Authors: Mazzarella G., Malomed B.A., Salasnich L., Salerno M., Toigo F.

Autors Affiliation: Univ Padua, Dipartimento Fis Galileo Galilei, I-35122 Padua, Italy;
Univ Padua, CNISM, I-35122 Padua, Italy;
Tel Aviv Univ, Fac Engn, Dept Phys Elect, IL-69978 Tel Aviv, Israel;
CNR – Istituto Nazionale di Ottica, I-50019 Sesto Fiorentino, Italy;
Univ Salerno, Dipartimento Fis ER Caianiello, CNISM, I-84084 Fisciano, SA, Italy;
Univ Salerno, INFN Grp Collegato Salerno, I-84084 Fisciano, SA, Italy

Abstract: We investigate the dynamics of two-component Bose-Einstein condensates, composed of atoms in two distinct hyperfine states, which are linearly coupled by two-photon Raman transitions. The condensate is loaded into a double-well potential. A variety of dynamical behaviour, ranging from regular Josephson oscillations to mixed Rabi-Josephson oscillations and to regimes featuring increasing complexity are described in terms of a reduced Hamiltonian system with four degrees of freedoms, which are the numbers of atoms in each component in the left and right potential wells, whose canonically conjugate variables are phases of the corresponding wavefunctions. Using the system with four degrees of freedom, we study the dynamics of fractional imbalances of the two bosonic components and compare the results to direct simulations of the Gross-Pitaevskii equations describing the bosonic mixture. We perform this analysis when the fractional imbalance oscillates around a zero-time averaged value and in the self-trapping regime as well.


Volume: 44 (3)      Pages from: 035301  to: 035301

KeyWords: BEC
DOI: 10.1088/0953-4075/44/3/035301

Citations: 22
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