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arXiv:1106.5717 · Physics Letters A

Finite-temperature nonlinear dynamics in cavity QED: A thermofield dynamics approach

D. U. Matrasulov, T. Ruzmetov, D.M. Otajanov, Pulat K. Khabibullaev, Abdulla A. Saidov, F. C. Khanna

Published Nov 22, 2008• 5 citations
arXivHTMLPDF
DOI
10.1016/j.physleta.2008.11.028

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Chemical systems normally possess strong nonlinear vibronic couplings at both zero and finite temperature. For the lowest-order quadratic couplings, here, we introduce a squeezing operator into a variational coherent-state-based method, Davydov ansatz, to simulate the quantum dynamics and the respective spectroscopy. Two molecular systems, pyrazine and the 2-pyridone dimer, are taken as calculated model systems, both of which involve nontrivial quadratic vibronic couplings in high- and low-frequency regions, respectively. Upon a comparison with the benchmarks, the method manifests its advantage for nonlinear couplings. The squeezed bases are also proven to be applicable for the finite temperature by adapting with the thermofield dynamics.