Open AccessCorrelated tunneling of cold atoms in double-well potential
Author(s) -
Hui Cao,
Zhao Qing
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.2187
Subject(s) - quantum tunnelling , physics , excited state , hamiltonian (control theory) , ground state , double well potential , hubbard model , bose–hubbard model , atomic physics , population , condensed matter physics , quantum mechanics , superconductivity , mathematical optimization , mathematics , demography , sociology
The tunneling phenomena of cold atoms in double-well with different interaction (U) and tunnel coupling (J) were studied. Experiments cannot be interpreted completely by a two-site Bose-Hubbard model. Thus, a new model was introduced, in which the ground state and the first excited state of the double-well were used as state bases. The expression of Hamiltonian was derived under the new model, which explains the reason why the parameter isnot consistent with the experiment from a two-site Bose-Hubbard model. Furthermore, we figured out the fluctuation of entanglement degree of the atoms in the double-well, and directly described the whole process of tunneling with the population of particles in the three states.