Renormalization approach to quasiperiodic tight binding models

Jukka A. Ketoja, Indubala I. Satij

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)


Tight binding models such as the Harper equation exhibiting the localization transition are studied using a nonperturbative renormalization method. The self-similarity underlying the fractal wave function is described by an infinite set of universal scaling ratios. Our studies confirm the existence of a fat critical phase in perturbed Harper models describing quantum spin chains and shows the existence of two new universality classes. Furthermore, the decimation scheme proposed here provides a new method for finding the minimum and the maximum energy eigenvalues up to machine precision.

Original languageEnglish
Pages (from-to)64-70
Number of pages7
JournalPhysics Letters A
Issue number1-2
Publication statusPublished - 24 Oct 1994
MoE publication typeNot Eligible


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