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Springer eBooks

Hydrogen in Strong DC and Low Frequency Electric Fields — One Dimensional Atoms

Munir Hasan Nayfeh, David Carl Humm, Mark S. Peercy

Published Jan 1, 1989• 0 citations
Publisher
DOI
10.1007/978-3-642-88421-4_28

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The behavior of Rydberg atoms in a recent experiment involving selective excitation in combined ac and dc electric fields is shown to be consistent with the predictions of a one-dimensional model incorporating only the extreme level of each Stark manifold. For low microwave powers, the excitation is resonant and is described qualitatively by multiphoton perturbation theory. For higher powers, an alternative stochastic theory predicts rapid ionization at all frequencies, as observed experimentally.
We theoretically propose a route to control magnetic and topological orders in a broad class of insulating magnets with a DC electric field. We show from the strong-coupling expansion that magnetic exchange interactions along the electric field direction are generally enhanced in Mott insulators. Employing this DC field effect, we demonstrate that several magnetic or topological ordered phases such as quantum spin liquids and Haldane-gap states can be induced if we apply a strong enough DC electric field to typical frustrated or low-dimensional magnets. Our proposal is effective especially for magnets in the vicinity of magnetic phase transition points, and would also be applicable for magnets under low-frequency AC electric fields such as terahertz laser pulses. A similar strategy of controlling exchange interactions can also be utilized in cold atomic systems.