Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2005-12-24
Phys.Rev.A74:013615,2006
Physics
Condensed Matter
Other Condensed Matter
14 pages, 4 figures, revtex4; typos corrected, references added, version to appear in Phys. Rev. A
Scientific paper
10.1103/PhysRevA.74.013615
We construct a Galilean invariant low-energy effective field theory of boson-fermion mixtures and study bound fermion states on a vortex of boson superfluid. We derive a simple criterion to determine for which values of the fermion angular momentum l there exist an infinite number of bound energy levels. We apply our formalism to two boson-fermion mixed systems: the dilute solution of He3 in He4 superfluid and the cold polarized Fermi gas on the BEC side of the "splitting point". For the He3-He4 mixture, we determine parameters of the effective theory from experimental data as functions of pressure. We predict that infinitely many bound He3 states on a superfluid vortex with l=-2,-1,0 are realized in a whole range of pressure, 0\sim20 atm, where experimental data are available. As for the cold polarized Fermi gas, while only S-wave (l=0) and P-wave (l=\pm1) bound fermion states are possible in the BEC limit, those with higher negative angular momentum become available as one moves away from the BEC limit.
Nishida Yusuke
Son Dam Thanh
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