A note on discrete Borg-type theorems
Spectral Theory
2019-09-18 v2
Abstract
We consider the discrete versions of the well known Borg theorem and use simple linear algebraic techniques to obtain new versions of the discrete Borg type theorems. To be precise, we prove that the periodic potential of a discrete Schrodinger operator is almost a constant if and only if the possible spectral gaps of the operator are of small width. This result is further extended to more general settings and the connection to the well known Ten Martini problem is also discussed.
Cite
@article{arxiv.1609.06518,
title = {A note on discrete Borg-type theorems},
author = {V. B. Kiran Kumar and G. Krishna Kumar},
journal= {arXiv preprint arXiv:1609.06518},
year = {2019}
}