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- W1544402016 abstract "We present a heuristic derivation of the strong form of the Levinson theorem for one-dimensional quasi-periodic potentials. The particular potential chosen is a distorted Kronig-Penney model. This theorem relates the phase shifts of the states at each band edge to the number of states crossing that edge, as the system evolves from a simple periodic potential to a distorted one. By applying this relationship to the two edges of each energy band, the modified Levinson theorem for quasi-periodic potentials is derived. These two theorems differ from the usual ones for isolated potentials in nonrelativistic and relativistic quantum mechanics by a crucial alternating sign factor ( 1) s , where s refers to the adjacent gap or band index, as explained in the text. We also relate the total number of bound states present in each energy gap due to the distortion to the phase shifts at its edges. At the end we present an overall relationship between all of the phase shifts at the band edges and the total number of bound states present. PACS numbers:" @default.
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- W1544402016 date "2009-11-18" @default.
- W1544402016 modified "2023-09-27" @default.
- W1544402016 title "The strong form of the Levinson theorem for a distorted KP potential" @default.
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