601 research outputs found
Quantum energy flow in atomic ions moving in magnetic fields
Using a combination of semiclassical and recently developed wave packet
propagation techniques we find the quantum self-ionization process of highly
excited ions moving in magnetic fields which has its origin in the energy
transfer from the center of mass to the electronic motion. It obeys a time
scale by orders of magnitude larger than the corresponding classical process.
Importantly a quantum coherence phenomenon leading to the intermittent
behaviour of the ionization signal is found and analyzed. Universal properties
of the ionization process are established.Comment: 4 pages, 4 figure
Quantum dynamics of resonant molecule formation in waveguides
We explore the quantum dynamics of heteronuclear atomic collisions in
waveguides and demonstrate the existence of a novel mechanism for the resonant
formation of polar molecules. The molecular formation probabilities can be
tuned by changing the trap frequencies characterizing the transverse modes of
the atomic species. The origin of this effect is the confinement-induced mixing
of the relative and center of mass motions in the atomic collision process
leading to a coupling of the diatomic continuum to center of mass excited
molecular states in closed transverse channels.Comment: 11 pages, 5 figure
Mathematical Modeling of Resonant Processes in Confined Geometry of Atomic and Atom-Ion Traps
We discuss computational aspects of the developed mathematical models for resonant processes in confined geometry of atomic and atom-ion traps. The main attention is paid to formulation in the nondirect product discrete-variable representation (npDVR) of the multichannel scattering problem with nonseparable angular part in confining traps as the boundary-value problem. Computational efficiency of this approach is demonstrated in application to atomic and atom-ion confinement-induced resonances we predicted recently
Suppression of Quantum Scattering in Strongly Confined Systems
We demonstrate that scattering of particles strongly interacting in three
dimensions (3D) can be suppressed at low energies in a quasi-one-dimensional
(1D) confinement. The underlying mechanism is the interference of the s- and
p-wave scattering contributions with large s- and p-wave 3D scattering lengths
being a necessary prerequisite. This low-dimensional quantum scattering effect
might be useful in "interacting" quasi-1D ultracold atomic gases, guided atom
interferometry, and impurity scattering in strongly confined quantum wire-based
electronic devices.Comment: 3 figs, Phys. Rev. Lett. (early November issue
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