Lattice Fluctuations at a Double Phonon Frequency with and without Squeezing: An Exactly Solvable Model of an Optically Excited Quantum Dot

S. Sauer, J. M. Daniels, D. E. Reiter, T. Kuhn, A. Vagov, and V. M. Axt

Phys. Rev. Lett. 105, 157401 – Published 5 October 2010

Abstract

Time-dependent lattice fluctuations of an optically excited strongly confined quantum dot are investigated with the aim to analyze the characteristics commonly used for identifying the presence of squeezed phonon states. It is demonstrated that the appearance of fluctuations oscillating with twice the phonon frequency, commonly regarded as a clear indication of squeezed states, cannot be considered as such. The source of the discrepancy with earlier investigations is discussed. Conditions for generating a squeezed state by using a two-pulse excitation are analyzed.

Received 29 January 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.157401

Authors & Affiliations

S. Sauer¹, J. M. Daniels¹, D. E. Reiter¹, T. Kuhn¹, A. Vagov², and V. M. Axt²

¹Institut für Festkörpertheorie, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Strasse 10, 48149 Münster, Germany
²Theoretische Physik III, Universität Bayreuth, 95440 Bayreuth, Germany

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Vol. 105, Iss. 15 — 8 October 2010

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