Proves existence of spatially exponentially localized time-periodic ground states in d-dimensional discrete NLS with delta potential and power nonlinearity, with explicit lower excitation thresholds for focusing cases and upper thresholds for defocusing cases, plus scattering below threshold.
Newell, Solitons in Mathematics and Physics SIAM: Philadelphia, PA, USA, 1985
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Nonlinear discrete Schr\"odinger equations with a point defect
Proves existence of spatially exponentially localized time-periodic ground states in d-dimensional discrete NLS with delta potential and power nonlinearity, with explicit lower excitation thresholds for focusing cases and upper thresholds for defocusing cases, plus scattering below threshold.