Abstract:
Given a one-dimensional Stark–Wannier operator, we study the reflection coefficient and its poles in the lower half of the complex plane far from the real axis. In particular, the reflection coefficient is described asymptotically in terms of regularized infinite cubic exponential sums.
The present work was supported by the RFBR grant 14-01-00760-a. A. F. also acknowledges the support of the Fondation Sciences Mathématiques de Paris, and F. K. acknowledges the support of the Chebyshev Laboratory and the French Embassy in Russia through the Lamé chair. Both authors acknowledge the support of the Simons foundation and the hospitality of the Isaac Newton Institute, Cambridge (UK), where this work was completed as a part of the program “Periodic and ergodic spectral problems” (supported by the grant EPSRC/EP/K032208/1).
Citation:
F. Klopp, A. A. Fedotov, “Stark–Wannier ladders and cubic exponential sums”, Funktsional. Anal. i Prilozhen., 50:3 (2016), 81–85; Funct. Anal. Appl., 50:3 (2016), 223–236
This publication is cited in the following 2 articles:
D. I. Borisov, D. A. Zezyulin, “Spacing gain and absorption in a simple pt-symmetric model: spectral singularities and ladders of eigenvalues and resonances”, J. Phys. A-Math. Theor., 52:44 (2019), 445202
N. D. Filonov, “Number of non-zero cubic sums”, J. Math. Sci. (N. Y.), 242:4 (2019), 575–585