### Abstract

Using the effective action formalism, we investigate collective excitations of a dilute mixture of a Bose gas and a two component Fermi gas when both bosons and fermions have undergone superfluid transitions. We show that there is a repulsion between Bogoliubov and Anderson modes, which has important implications including disappearance of boson superfluidity. We derive an analytic expression for the long-wavelength dispersion relation of the mixture at zero temperature and give a condition for the instability. We also numerically calculate the damping rate due to boson-fermion interaction at finite temperatures and show that the two modes are stable at sufficiently low temperatures.

Original language | English |
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Pages (from-to) | 217-222 |

Number of pages | 6 |

Journal | Laser Physics |

Volume | 12 |

Issue number | 1 |

Publication status | Published - 2002 Jan 1 |

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### ASJC Scopus subject areas

- Physics and Astronomy (miscellaneous)
- Atomic and Molecular Physics, and Optics

### Cite this

*Laser Physics*,

*12*(1), 217-222.

**Collective excitations of dilute Bose-Fermi superfluid mixtures.** / Valtan, B. H.; Nishida, M.; Kurihara, S.

Research output: Contribution to journal › Article

*Laser Physics*, vol. 12, no. 1, pp. 217-222.

}

TY - JOUR

T1 - Collective excitations of dilute Bose-Fermi superfluid mixtures

AU - Valtan, B. H.

AU - Nishida, M.

AU - Kurihara, S.

PY - 2002/1/1

Y1 - 2002/1/1

N2 - Using the effective action formalism, we investigate collective excitations of a dilute mixture of a Bose gas and a two component Fermi gas when both bosons and fermions have undergone superfluid transitions. We show that there is a repulsion between Bogoliubov and Anderson modes, which has important implications including disappearance of boson superfluidity. We derive an analytic expression for the long-wavelength dispersion relation of the mixture at zero temperature and give a condition for the instability. We also numerically calculate the damping rate due to boson-fermion interaction at finite temperatures and show that the two modes are stable at sufficiently low temperatures.

AB - Using the effective action formalism, we investigate collective excitations of a dilute mixture of a Bose gas and a two component Fermi gas when both bosons and fermions have undergone superfluid transitions. We show that there is a repulsion between Bogoliubov and Anderson modes, which has important implications including disappearance of boson superfluidity. We derive an analytic expression for the long-wavelength dispersion relation of the mixture at zero temperature and give a condition for the instability. We also numerically calculate the damping rate due to boson-fermion interaction at finite temperatures and show that the two modes are stable at sufficiently low temperatures.

UR - http://www.scopus.com/inward/record.url?scp=0036428408&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036428408&partnerID=8YFLogxK

M3 - Article

VL - 12

SP - 217

EP - 222

JO - Laser Physics

JF - Laser Physics

SN - 1054-660X

IS - 1

ER -