Spontaneous symmetry breaking and collapse in bosonic Josephson junctions

Year: 2010

Authors: Mazzarella G., Salasnich L.

Autors Affiliation: Dipartimento di Fisica “Galileo Galilei” and Consorzio Nazionale nteruniversitatio per le Scienze Fisiche della Materia (CNISM),Università di Padova, Via Marzolo 8, I-35122 Padova, Italy; CNR – Istituto Nazionale di Ottica Research Unit at Padova, Via Marzolo 8, I-35122 Padova, Italy; Center for Applied Mathematics and Theoretical Physics, University of Maribor, Krekova 2, SI-2000 Maribor, Slovenia

Abstract: We investigate an attractive atomic Bose-Einstein condensate (BEC) trapped by a double-well potential in the axial direction and by a harmonic potential in the transverse directions. We obtain numerically a quantum phase diagram which includes all the three relevant phases of the system: Josephson, spontaneous symmetry breaking (SSB), and collapse. We consider also the coherent dynamics of the BEC and calculate the frequency of population-imbalance mode in the Josephson phase and in the SSB phase up to the collapse. We show that these phases can be observed by using ultracold vapors of Li-7 atoms in a magneto-optical trap.

Journal/Review: PHYSICAL REVIEW A

Volume: 82 (3)      Pages from: 33611-1  to: 33611-5

KeyWords: Bose-einstein Condensate; Oscillations; Dynamics; Clouds
DOI: 10.1103/PhysRevA.82.033611

Citations: 13
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