Phase transition in aperiodic spin chains |
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| Authors: | H A Ceccatto |
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| Affiliation: | (1) Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-5000 Köln 41, Federal Republic of Gemany;(2) Present address: Instituto de Fisica Rosario (IFIR), Av. Pellegrini 250, 2000 Rosario, Argentina |
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| Abstract: | The quantum-mechanical transition in the ground state of some aperiodic spin chains is considered. Exact expressions for the energy gap and the dispersion relation of low-energy excitations close to the critical point are derived. Applications of these results to the study of particular quasiperiodic and random models are discussed. |
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