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Title

Confinement-induced resonances in anharmonic waveguides

Author(s)

Peng, Shi-Guo;  Hu, Hui;  Liu, Xia-Ji;  Drummond, Peter D.

Abstract

We develop the theory of anharmonic confinement-induced resonances (ACIRs). These are caused by anharmonic excitation of the transverse motion of the center of mass (c.m.) of two bound atoms in a waveguide. As the transverse confinement becomes anisotropic, we find that the c.m. resonant solutions split for a quasi-one-dimensional (1D) system, in agreement with recent experiments. This is not found in harmonic confinement theories. A new resonance appears for repulsive couplings (a3D>0) for a quasi-two-dimensional (2D) system, which is also not seen with harmonic confinement. After inclusion of anharmonic energy corrections within perturbation theory, we find that these ACIRs agree extremely well with anomalous 1D and 2D confinement-induced resonance positions observed in recent experiments. Multiple even- and odd-order transverse ACIRs are identified in experimental data, including up to N=4 transverse c.m. quantum numbers.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Atom Optics and Ultrafast Spectroscopy

Source

Physical Review A: Atomic, Molecular, and Optical Physics, Vol. 84, no. 4 (Oct 2011), paper no. 043619

Publication year

2011

FOR Code(s)

01 Mathematical Sciences;  02 Physical Sciences;  03 Chemical Sciences

Keyword(s)

Anharmonic waveguides;  Atoms;  Confinement-induced resonances

Publisher

American Physical Society

ISSN

1050-2947

Publisher URL

http://dx.doi.org/10.1103/PhysRevA.84.043619

Copyright

Copyright © 2011 American Physical Society. The published version of the paper is reproduced here with the kind permission of the publisher.

Research Projects

Imbalanced superfluidity: the quantum mystery that defies solution, Australian Research Project grant number DP0984637
Dynamics and correlations of many-body systems, Australian Research Council grant number DP0880404
Ultracold atomic Fermi gases in the strongly interacting regime: a new frontier of quantum many-body physics, Australian Research Council grant number DP0984522

Full text

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