Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-03-05
Phys. Rev. A 83, 053624 (2011)
Physics
Condensed Matter
Quantum Gases
45 pages, 16 figures
Scientific paper
10.1103/PhysRevA.83.053624
We investigate tunneling of excitations across a potential barrier separating two spin-1 Bose-Einstein condensates. Using the mean-field theory at the absolute zero temperature, we determine transmission coefficients of excitations in the saturated magnetization state and unsaturated magnetization states. All excitations except the quadrupolar spin mode in the saturated magnetization state show the anomalous tunneling phenomenon characterized as perfect tunneling in the low momentum limit through a potential barrier. The quadrupolar spin mode in the saturated magnetization state, whose spectrum is massive, shows total reflection. We discuss properties common between excitations showing the anomalous tunneling phenomenon. Excitations showing perfect tunneling have gapless spectrum in the absence of the magnetic field, and their wave functions in the low energy limit are the same as the condensate wave function.
Kato Yusuke
Watabe Shohei
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