Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2003-05-21
Physics
Condensed Matter
Soft Condensed Matter
to appear in Phys. Rev. A, 2 figures
Scientific paper
10.1103/PhysRevA.67.065601
The energy band structure and energy splitting due to quantum tunneling in two weakly linked Bose-Einstein condensates were calculated by using the instanton method. The intrinsic coherent properties of Bose Josephson junction were investigated in terms of energy splitting. For $E_{C}/E_{J}\ll 1$, the energy splitting is small and the system is globally phase coherent. In the opposite limit, $E_{C}/E_{J}\gg 1$, the energy splitting is large and the system becomes a phase dissipation. Our reslults suggest that one should investigate the coherence phenomna of BJJ in proper condition such as $E_{C}/E_{J}\sim 1$.
Li Wei-Dong
Liang Jing-Qiu
Zhang Yunbo
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