Adiabatic Output Coupling of a Bose Gas at Finite Temperatures

Abstract

We develop a general theory of adiabatic output coupling from trapped atomic Bose-Einstein Condensates at finite temperatures. For weak coupling, the output rate from the condensate, and the excited levels in the trap, settles in a time proportional to the inverse of the spectral width of the coupling to the output modes. We discuss the properties of the output atoms in the quasi-steady-state where the population in the trap is not appreciably depleted. We show how the composition of the output beam, containing condensate and thermal component, may be controlled by changing the frequency of the output coupler. This composition determines the first and second order coherence of the output beam. We discuss the changes in the composition of the bose gas left in the trap and show how nonresonant output coupling can stimulate either the evaporation of thermal excitations in the trap or the growth of non-thermal excitations, when pairs of correlated atoms leave the condensate.

22 pages, 6 Figs. To appear in Physical Review A All the typos from the previous submission have been fixed

References in corpus (7)

• An Atom Laser with a cw Output Coupler
• Spatial coherence and density correlations of trapped Bose gases
• Damping of low-energy excitations of a trapped Bose condensate at finite temperatures
• Output coupling of a Bose-Einstein condensate formed in a TOP trap
• The Markov approximation for the atomic output coupler
• Output coupling and flow of a dilute Bose-Einstein condensate
• Atomic detection and matter-waves coherence

Cited by in corpus (17)

• Correlations and Counting Statistics of an Atom Laser
• Single-particle excitations in a trapped gas of Fermi atoms in the BCS-BEC crossover region
• Quasi-continuous atom laser in the presence of gravity
• Dynamic correlation functions in one-dimensional quasi-condensates
• Laser probing of single-particle energy gap of a Bose gas in an optical lattice in the Mott insulator phase
• Theoretical tools for atom laser beam propagation
• Coherent Tunneling of Atoms from Bose-condensed Gases at Finite Temperatures
• Atom laser dynamics
• Non-Markovian dynamics in atom-laser outcoupling from a double-well Bose-Einstein condensate
• Raman Spectroscopy of Mott insulator states in optical lattices
• The Theory of Atom Lasers
• Effects of interatomic collisions on atom laser outcoupling
• Homodyne detection of matter-wave fields (shortened)
• Magnetic noise spectrum measurement by an atom laser in gravity
• Wave-packet analysis of interference patterns in output coupled atoms
• Precision measurement with an optical Josephson junction
• Theory of output coupling for trapped fermionic atoms