Polaronic slowing of fermionic impurities in lattice Bose-Fermi mixtures

Journal Article · Wed Dec 15 04:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.063614· OSTI ID:21528937

Privitera, A ^[1]; Hofstetter, W ^[2]

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1. Dipartimento di Fisica, Universita di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185 Roma (Italy)
2. Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, D-60438 Frankfurt am Main (Germany)

We generalize the application of small polaron theory to ultracold gases [M. Bruderer, A. Klein, S. R. Clark, and D. Jaksch, New J. Phys. 10, 033015 (2008)] to the case of Bose-Fermi mixtures, where both components are loaded into an optical lattice. In a suitable range of parameters, the mixture can be described within a Bogoliubov approach in the presence of fermionic (dynamic) impurities; an effective description in terms of polarons applies. In the dilute limit of the slow-impurity regime, the hopping of fermionic particles is exponentially renormalized due to polaron formation, regardless of the sign of the Bose-Fermi interaction. This should lead to clear experimental signatures of polaronic effects, once the regime of interest is reached. The validity of our approach is analyzed in the light of currently available experiments. We provide results for the hopping renormalization factor for different values of temperature, density, and Bose-Fermi interaction for three-dimensional {sup 87}Rb-{sup 40}K mixtures in an optical lattice.

• OSTI ID: 21528937
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 82; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
BASIC INTERACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BOSE-EINSTEIN GAS
ELECTRON CAPTURE RADIOISOTOPES
FERMI INTERACTIONS
FERMIONS
INTERACTIONS
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIGHT NUCLEI
NANOSECONDS LIVING RADIOISOTOPES
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
POLARONS
POTASSIUM 40
POTASSIUM ISOTOPES
QUASI PARTICLES
RADIOISOTOPES
RENORMALIZATION
RUBIDIUM 87
RUBIDIUM ISOTOPES
THREE-DIMENSIONAL CALCULATIONS
WEAK INTERACTIONS
YEARS LIVING RADIOISOTOPES