Geometric-phase-induced false electric dipole moment signals for particles in traps

Harris, P. G., Pendlebury, J. M., Heil, W., Sobolev, Y., Richardson, J. D., Baskin, R. J., Doyle, D. D., Geltenbort, P., Green, K., van der Grinten, M. G. D., Iaydjiev, P. S., Ivanov, S. N., May, D. J. R. and Smith, K. F. (2004) Geometric-phase-induced false electric dipole moment signals for particles in traps. Physical Review A, 70 (3). ISSN 1050-2947

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Theories are developed to evaluate Larmor frequency shifts, derived from geometric phases, in experiments to measure electric dipole moments (EDM's) of trapped, atoms, molecules, and neutrons. A part of these shifts is proportional to the applied electric field and can be interpreted falsely as an electric dipole moment. A comparison is made between our theoretical predictions for these shifts and some results from our recent experiments, which shows agreement to within the experimental errors of 15%. The comparison also demonstrates that some trapped particle EDM experiments have reached a sensitivity where stringent precautions are needed to minimize and control such false EDM's. Computer simulations of these processes are also described. They give good agreement with the analytical results and they extend the study by investigating the influence of varying surface reflection laws in the hard-walled traps considered. They also explore the possibility to suppress such false EDM's by introducing collisions with buffer gas particles. Some analytic results for frequency shifts proportional to the square of the E field are also given and there are results for the averaging of the B field in the absence of an E field.

Item Type: Article
Keywords: electric moments; atomic moments; weak interactions (atomic physics)
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Gemma Farrell
Date Deposited: 25 Nov 2007
Last Modified: 06 Mar 2017 03:58
Google Scholar:63 Citations

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