Browsing by Author "Ye, S."

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    Characterizing high-n quasi-one-dimensional strontium Rydberg atoms
    (American Physical Society, 2014) Hiller, M.; Yoshida, S.; Burgdörfer, J.; Ye, S.; Zhang, X.; Dunning, F.B.; Rice Quantum Institute
    The production of high-n, n ∼ 300, quasi-one-dimensional (quasi-1D) strontium Rydberg atoms through two-photon excitation of selected extreme Stark states in the presence of a weak dc field is examined using a crossed laser-atom beam geometry. The dipolar polarization of the electron wave function in the product states is probed using two independent techniques. The experimental data are analyzed with a classical trajectory Monte Carlo simulation employing initial ensembles that are obtained with the aid of quantum calculations based on a two-active-electron model. Comparisons between theory and experiment highlight different characteristics of the product quasi-1D states, in particular, their large permanent dipole moments, ∼1.0 to 1.2n2ea0, where e is the electronic charge and a0 is the Bohr radius. Such states can be engineered using pulsed electric fields to create a wide variety of target states
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    Efficient three-photon excitation of quasi-one-dimensional strontium Rydberg atoms with n ~ 300
    (American Physical Society, 2014) Ye, S.; Zhang, X.; Dunning, F.B.; Yoshida, S.; Hiller, M.; Burgdörfer, J.; Rice Quantum Institute
    The efficient production of very-high-n, n ~ 300, quasi-one-dimensional (quasi-1D) strontium Rydberg atoms through three-photon excitation of extreme Stark states in the presence of a weak dc field is demonstrated using a crossed laser-atom beam geometry. Strongly polarized quasi-1D states with large permanent dipole moments ∼1.2n2 a.u. can be created in the beam at densities (∼106 cm−3) where dipole blockade effects should become important. A further advantage of three-photon excitation is that the product F states are sensitive to the presence of external fields, allowing stray fields to be reduced to very small values. The experimental data are analyzed using quantum calculations based on a two-active-electron model together with classical trajectory Monte Carlo simulations. These allow determination of the atomic dipole moments and confirm that stray fields can be reduced to _25 μV cm−1.
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    Production of high-n strontium Rydberg atoms
    (IOP Publishing, 2014) Ye, S.; Zhang, X.; Killian, T.C.; Dunning, F.B.; Hiller, M.; Yoshida, S.; Burgdörfer, J.
    The photoexcitation of strontium Rydberg atoms with n~300 is being examined using a crossed laser-atom beam approach to enable study of quasi-stable two-electron excited states and of strongly-coupled Rydberg systems.