Quantum dynamics of impurities in a one-dimensional Bose gas

Year: 2012

Authors: Catani J., Lamporesi G., Naik D., Gring M., Inguscio M., Minardi F., Kantian A., Giamarchi T.

Autors Affiliation: LENS – European Laboratory for Non-Linear Spectroscopy and Dipartimento di Fisica,Università di Firenze, via N. Carrara 1, IT-50019 Sesto Fiorentino–Firenze, Italy;
CNR – INO, via G. Sansone 1, IT-50019 Sesto Fiorentino–Firenze, Italy;
Vienna Center for Quantum Science and Technology, Atominstitut, TU-Wien, AT-1020 Vienna, Austria;
DPMC-MaNEP, University of Geneva, 24 Quai Ernest-Ansermet, CH-1211 Geneva, Switzerland

Abstract: Using a species-selective dipole potential, we create initially localized impurities and investigate their interactions with a majority species of bosonic atoms in a one-dimensional configuration during expansion. We find an interaction-dependent amplitude reduction of the oscillation of the impurities\’size with no measurable frequency shift, and study it as a function of the interaction strength.We discuss possible theoretical interpretations of the data. We compare, in particular, with a polaronic mass shift model derived following Feynman variational approach.


Volume: 85 (2)      Pages from: 023623  to: 023623

More Information: This work was supported by MIUR PRIN 2007, Ente CdR Firenze, EU under STREP NAME-QUAM and CHIMONO, ERC DISQUA and the Swiss FNS under MaNEP and Division II. M.G. is supported by Austrian Science Fund (FWF): W1210, CoQuS.
KeyWords: Bose gas; Bosonic atoms; Dipole potential; Frequency shift; Impurities in; Interaction strength; Localized impurity; Mass shift; Quantum dynamics; Variational approaches, Mathematical models; Physics, Quantum theory
DOI: 10.1103/PhysRevA.85.023623

Citations: 270
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