Some basic aspects of quantum phase transitions

Details Some basic aspects of quantum phase transitions Some basic aspects of quantum phase transitions

2003-01-22

arxiv.org/abs/cond-mat/0301423v1

Phys.Rep. C 379 (2003) 1-67

Physics

Condensed Matter

Statistical Mechanics

81 pages, Latex2e, 8 figures, Phys. Rep.(2003) in press

Scientific paper

10.1016/S0370-1573(03)00076-0

Several basic problems of the theory of quantum phase transitions are reviewed. The effect of the quantum correlations on the phase transition properties is considered with the help of basic models of statistical physics. The effect of quenched disorder on the quantum phase transitions is also discussed. The review is performed within the framework of the thermodynamic scaling theory and by the most general methods of statistical physics for the treatment of phase transitions: general length-scale arguments, exact solutions, mean field approximation, Hubbard-Stratonovich transformation, Feynman path integral approach, and renormalization group in the field theoretical variant. Some new ideas and results are presented. Outstanding theoretical problems are mentioned.

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