Magnetization and Collective Excitations of a Magnetic Dipole Fermion Gas
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概要
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The ground states of trapped Fermion gases consisting of atoms with magnetic dipole moment are studied using the time-dependent Hartee--Fock approximation (TDHFA). We also study the effects of quantum fluctuations using the time-dependent density-matrix approach (TDDMA). It was shown that the magnetization associated with the instability against the Rashba like spin--orbit mode realizes first and that such magnetization can occur independently of the number of atoms N. Comparison with the exact solutions given in the TDDMA for an N=2 system suggests that the instabilities given by the Hartree--Fock approximation are shifted to stronger interaction regimes due to quantum fluctuations. It is also pointed out that the tensor properties of the dipole--dipole interaction can be revealed in the excitations associated with spin degrees of freedom.
- 2013-12-15
著者
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Tohyama Mitsuru
Kyorin Univ. School Of Medicine Mitaka Jpn
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Tohyama Mitsuru
Kyorin University School of Medicine, Mitaka, Tokyo 181-8611, Japan
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