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Title: Electric Dipole Echoes in Rydberg Atoms

Authors:
 [1];  [2];  [1];  [3];  [3];  [3];  [3]
  1. Institute for Theoretical Physics, Vienna University of Technology, Austria
  2. ORNL
  3. Rice University
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
948070
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 20
Country of Publication:
United States
Language:
English

Citation Formats

Yoshida, S., Reinhold, Carlos O, Burgdorfer, J., Zhao, W., Mestayer, J. J., Lancaster, J. C., and Dunning, F. B.. Electric Dipole Echoes in Rydberg Atoms. United States: N. p., 2007. Web. doi:10.1103/PhysRevLett.98.203004.
Yoshida, S., Reinhold, Carlos O, Burgdorfer, J., Zhao, W., Mestayer, J. J., Lancaster, J. C., & Dunning, F. B.. Electric Dipole Echoes in Rydberg Atoms. United States. doi:10.1103/PhysRevLett.98.203004.
Yoshida, S., Reinhold, Carlos O, Burgdorfer, J., Zhao, W., Mestayer, J. J., Lancaster, J. C., and Dunning, F. B.. Tue . "Electric Dipole Echoes in Rydberg Atoms". United States. doi:10.1103/PhysRevLett.98.203004.
@article{osti_948070,
title = {Electric Dipole Echoes in Rydberg Atoms},
author = {Yoshida, S. and Reinhold, Carlos O and Burgdorfer, J. and Zhao, W. and Mestayer, J. J. and Lancaster, J. C. and Dunning, F. B.},
abstractNote = {},
doi = {10.1103/PhysRevLett.98.203004},
journal = {Physical Review Letters},
number = 20,
volume = 98,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}
  • We report the first observation of echoes in the electric dipole moment of an ensemble of Rydberg atoms precessing in an external electric field F. Rapid reversal of the field direction is shown to play a role similar to that of a {pi} pulse in NMR in rephasing a dephased ensemble of electric dipoles resulting in the buildup of an echo. The mechanisms responsible for this are discussed with the aid of classical trajectory Monte Carlo simulations.
  • The precession of an electric dipole moment in an external electric field can be reversed by reversing the field direction. This time-reversal operation allows study of coherence in the time evolution of Rydberg Stark wave packets by measuring the resulting echoes. Different sources of reversible dephasing and irreversible dephasing, i.e., decoherence, are discussed in detail. Stochastic interactions with the environment are simulated in a controlled manner by using artificially synthesized noise. The rate of irreversible dephasing is determined from the reduction of the echo amplitude under multiple field reversals.
  • Laser-cooled {sup 85}Rb atoms were optically excited to 46d{sub 5/2} Rydberg states. A microwave pulse transferred a fraction of the atoms to the 47p{sub 3/2} Rydberg state. The resonant electric dipole-dipole interactions between atoms in these two states were probed using the linewidth of the two-photon microwave transition 46d{sub 5/2}-47d{sub 5/2}. The presence of a weak magnetic field {approx_equal}0.5 G reduced the observed line broadening, indicating that the interaction is suppressed by the field. The field removes some of the energy degeneracies responsible for the resonant interaction, and this is the basis for a quantitative model of the resulting suppression.more » A technique for the calibration of magnetic field strengths using the 34s{sub 1/2}-34p{sub 1/2} one-photon transition is also presented.« less
  • High resolution laser Stark excitation of np (60<n<85) Rydberg states of ultracold cesium atoms shows an efficient blockade of the excitation attributed to long-range dipole-dipole interaction. The dipole blockade effect is observed as a quenching of the Rydberg excitation depending on the value of the dipole moment induced by the external electric field. Effects of ions which could match the dipole blockade effect are discussed in detail but are ruled out for our experimental conditions. Analytic and Monte Carlo simulations of the excitation of an ensemble of interacting Rydberg atoms agree with the experiments and indicate a major role ofmore » the nearest neighboring Rydberg atom.« less
  • In collisions of Rydberg atoms with charged projectiles at velocities approximately matching the speed of the Rydberg electron {ital v}{sub {ital n}} (matching velocity), {ital n} being the principal quantum number of the Rydberg level, the dipole-forbidden transitions with large angular-momentum transfer {Delta}{ital l}{gt}1 substantially dominate over dipole-allowed transitions {Delta}{ital l}=1, although both are induced by the dipole interaction. Here it is shown that as the projectile velocity decreases the adiabatic character of the depopulation depends on the energy distribution of states in the vicinity of the initial level. If the spectrum is close to degeneracy (as for high-{ital l}more » levels) the dipole-forbidden depopulation prevails practically over the entire low-velocity region, down to velocities {approximately}{ital n}{sup 3}[{Delta}{ital E}/Ry]{ital v}{sub {ital n}}, where {Delta}{ital E} is the energy spacing adjoining to the level due to either a quantum defect or the relevant level width or splitting, whichever is greater. If the energy gaps are substantial (as for strongly nonhydrogenic {ital s} and {ital p} levels in alkali-metal atoms), then the fraction of dipole transitions in the total depopulation reaches a flat minimum just below the matching velocity and then grows again, making the progressively increasing contribution to the low-velocity depopulation. The analytic models based on the first-order Born amplitudes (rather than the two-level adiabatic approximation) furnish reasonable estimates of the fractional dipole-allowed and dipole-forbidden depopulations. {copyright} {ital 1996 The American Physical Society.}« less