493 research outputs found
Localized - delocalized electron quantum phase transitions
Metal--insulator transitions and transitions between different quantum Hall
liquids are used to describe the physical ideas forming the basis of quantum
phase transitions and the methods of application of theoretical results in
processing experimental data. The following two theoretical schemes are
discussed and compared: the general theory of quantum phase transitions, which
has been developed according to the theory of thermodynamic phase transitions
and relies on the concept of a partition function, and a theory which is based
on a scaling hypothesis and the renormalization-group concept borrowed from
quantum electrodynamics, with the results formulated in terms of flow diagrams.Comment: 27 pages, 20 figure
Comment on: Weak Anisotropy and Disorder Dependence of the In-Plane Magnetoresistance in High-Mobility (100) Si Inversion Layers
Comment on: Weak Anisotropy and Disorder Dependence of the In-Plane
Magnetoresistance in High-Mobility (100) Si Inversion LayersComment: 1 page, submitted to PR
Quantum phase transitions in two-dimensional systems
Experimental data on quantum phase transitions in two-dimensional systems
(superconductor-insulator, metal-insulator, and transitions under conditions of
integer quantum Hall effect) are critically analyzed.Comment: 13 pages, 16 figure
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