Dresden 2006 – wissenschaftliches Programm

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SYIM: Intrinsic Modes

SYIM 2: Intrinsic Modes II

SYIM 2.1: Hauptvortrag

Donnerstag, 30. März 2006, 17:00–17:30, HSZ 04

Anomalous decay in doped alkali halides: Breather-induced impediments to relaxation — •Lawrence S. Schulman — Clarkson University, Potsdam, New York 13699-5820, USA

Enhanced and nonexponential decay of luminescence is found in some doped alkali halides following the absorption of a high energy photon by the impurity. This is explained by the formation of a discrete breather that prevents relaxation of the crystal. Impurity atoms in relatively long-lived states are driven by the crystal into shorter lifetime states leading to the enhancement. Because of the scale of these breathers, a quantum treatment is necessary, and we have found by path integral and other methods that aside from quantum tunneling (which is expected to be negligible) the breather is stable.
References:
L. S. Schulman, E. Mihokova, A. Scardicchio, P. Facchi, M. Nikl, K. Polak, B. Gaveau, Slow relaxation, confinement, and solitons, Phys. Rev. Lett. 88, 224101 (2002).
E. Mihokova, L. S. Schulman, K. Polak and W. Williams, The role of breathers in anomalous decay, Phys. Rev. E 70, 016610 (2004).
L. S. Schulman, D. Tolkunov and E. Mihokova, Structure and time-dependence of quantum breathers, Chem. Phys., to appear, 2005.