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Quantum Electronics and Laser Science Conference

Superfluorescenf transitions between high-lying levels of Sr I and Ba I In an external magnetic field

D. Bartholdtse, R.-H. Rinkleff

Published May 2, 1993• 0 citations
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The occurrence of superfluorescence in the near-infrared regime has been investigated between high-lying levels of Sr, Ba, and Na under the influence of a static homogeneous external electric field. The time inequalities for single-pulse superfluorescence were fulfilled. The measurements show for all the investigated superfluorescent transitions that the square root of the peak intensity of the superfluorescent pulse decreases with the square of the electric-field strength. If one takes into account the dependence of the number of excited atoms, the wavelengths, and the line strengths of the superfluorescent pulses on the electric-field strengths, the experimental findings cannot be explained by well-known theories of superfluorescence.
Collective emission in a resonant cavity was observed between high-lying levels in Sr and Ba. These transitions react very sensitively to a static external electric field. The square root of the maximum of the intensity of the superfluorescent pulse decreases linearly with the second power of the electric field strength. The behavior of the maximum of the intensity, of the characteristic superfluorescent time, and of the delay time of the superfluorescent pulse was described in the framework of modified Maxwell-Bloch equations and explained by a change of the characteristic time constant of the superfluorescent pulse.
Abstract In this work we examine a superradiant (SR) and/or ferromagnetic (FM) - paramagnetic (PM) phase transitions problem in quantum materials which may be established by Barabási-Albert (BA) scale-free network that possesses power law degree distribution and specific degree correlations. We represent quantum material by means of Dicke-Ising model, that describes the interaction between a spin-1/2 (two-level) system and external classical (magnetic) and quantized (transverse) fields. To describe PM-FM and SR phase transitions we introduce three order parameters: the total (topologically) weighted as well as un-weighted z-spin components, and the normalized transverse field amplitude, which correspond to the spontaneous magnetization in z- and x-directions, respectively. We have shown that SR state occurs as a result of the interaction between the ordering of the spins in the z− and x-directions and depends on assortativity or disassortativity of the network medium. We have shown that non-trivial topological behavior associated with large fluctuations of network parameters inherent to assortative networks reduces of PM-FM phase transition temperature, while dissasortative networks exhibit high temperature phase transitions. Our findings demonstrate new opportunities to design of quantum materials which may be implemented for current quantum technologies at relatively high temperatures.