Open AccessQuantum pumping of interacting bosons
Author(s) -
Roberta Citro,
Natan Andrei
Publication year - 2011
Publication title -
physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics
Language(s) - English
Resource type - Journals
eISSN - 1094-1622
pISSN - 1050-2947
DOI - 10.1103/physreva.83.015601
Subject(s) - physics , boson , quantum , quantum mechanics , bose–einstein condensate , coupling (piping) , luttinger liquid , amplitude , quantum electrodynamics , mechanical engineering , engineering
Quantum pumping in an interacting one-dimensional Bose-Einstein condensate is analyzed. It is shown that a spatially periodic potential, oscillating adiabatically in time with frequency ω0, acts as a quantum pump inducing an atom current from broken spatiotemporal symmetries of the driven potential. The current generated by the pump is strongly affected by the interactions. It has a power-law dependence on the frequency with the exponent determined by the interaction, while the coupling to the pump affects the amplitudes. It depends on the phase difference between two umklapp terms of the drive, providing evidence for the full quantum character of the boson transport. The results suggest the realization of a quantum pump with laser-cooled atoms