Speaker
Description
Motivated by recent experiments on pump-induced polar ordering in the quantum paraelectric SrTiO$_3$, I will present a study of a driven phonon system close to a second-order polar transition.
Analyzing its classical dynamics, my collaborators and I find that sufficiently strong driving leads to transitions into polar phases whose structures, determined by the light polarization, are not all accessible in equilibrium. In addition, for certain intensity profiles, we demonstrate the possibility of two-step transitions as a function of fluence. For even stronger field intensities, the possibility of period-doubling and chaotic behavior is demonstrated. Finally, I’ll present a generalized formalism that allows us to consider quantum corrections to the classical dynamics in a systematic fashion. This leads to the prediction of the shift in the critical pump fluence due to quantum fluctuations with a characteristic dependence on the fluence increase rate that should be observable in experiment.
Reference: Z. Zhuang, A. Chakraborty, PC, P. Coleman and P.A. Volkov, arXiv:2301.06161 (accepted in PRB).
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