Critical Exponents for Metal-Insulator Transition in Two-Dimensional Systems |

J. Wojtkiewicz
Department for Mathematical Methods in Physics, Faculty of Physics, University of Warsaw, Hoża 74, 00-682 Warszawa, Poland |

Received: November 13, 2008; In final form: December 30, 2008 |

Full Text PDF |

Three years ago, a new universality class, associated with the metal-insulator transition in quasi-two-dimensional compounds, was discovered. Imada has given explanation of the observed critical behaviour. Considerations in this work are based on the assumption that the one-particle dispersion is quartic one instead of the standard quadratic behaviour. In this paper, it is shown that other possible natural non-standard dispersions lead to other possible critical behaviour and critical exponents. |

DOI: 10.12693/APhysPolA.115.931 PACS numbers: 71.30.+h, 71.10.Fd, 02.40.Xx |