Stability of quantum breathers.
Using two methods we show that a quantized discrete breather in a 1D lattice is stable. One method uses path integrals and compares correlations for a (linear) local mode with those of the quantum breather. The other takes a local mode as the zeroth order system relative to which numerical, cutoff-insensitive diagonalization of the Hamiltonian is performed.
Schulman
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Physics Department, Clarkson University, Potsdam, New York 13699-5820, USA. schulman@clarkson.edu
Tolkunov
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Mihokova
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