## Abstract

Magnetic-field-induced phase transitions in the two-dimensional electron system in a AlGaAs/InGaAs/GaAs heterostructure are studied. Two kinds of magnetic-field-induced phase transitions, plateau-plateau (P-P) and insulator-quantum Hall conductor (I-QH) transitions, are observed in the integer quantum Hall effect regime at high magnetic fields. In the P-P transition, both the semicircle law and the universality of critical conductivities are broken and we do not observe the universal scaling. However, the P-P transition can still be mapped to the I-QH transition by the Landau-level addition transformation, and as the temperature decreases the critical points of these two transitions appear at the same temperature. Our observations indicate that the equivalence between P-P and I-QH transitions can be found by the suitable analysis even when some expected universal properties are invalid.

Original language | English |
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Pages (from-to) | 197-201 |

Number of pages | 5 |

Journal | Solid State Communications |

Volume | 126 |

Issue number | 4 |

DOIs | |

State | Published - 1 Apr 2003 |

## Keywords

- D. Phase transitions
- D. Quantum Hall effect
- D. Scaling