We consider a semi-periodic two-dimensional Schrödinger operator which is cut at an angle. When the cut is commensurate with the periodic lattice, the spectrum of the operator has the band-gap Bloch structure. We prove that in the incommensurable case, there are no gaps: the gaps of the bulk operator are filled with edge spectrum.
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David Gontier 1
@article{CRMATH_2021__359_8_949_0, author = {David Gontier}, title = {Spectral properties of periodic systems cut at an angle}, journal = {Comptes Rendus. Math\'ematique}, pages = {949--958}, publisher = {Acad\'emie des sciences, Paris}, volume = {359}, number = {8}, year = {2021}, doi = {10.5802/crmath.251}, language = {en}, }
David Gontier. Spectral properties of periodic systems cut at an angle. Comptes Rendus. Mathématique, Volume 359 (2021) no. 8, pp. 949-958. doi : 10.5802/crmath.251. https://comptes-rendus.academie-sciences.fr/mathematique/articles/10.5802/crmath.251/
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