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MA: Fachverband Magnetismus

MA 18: PhD symposium of the Division of Magnetism and the jDPG 2015: Quantum Phase Transitions: Emergent phenomena beyond elementary excitations

MA 18.4: Hauptvortrag

Dienstag, 17. März 2015, 11:30–12:15, EB 301

Theoretical Concepts of Quantum Phase Transitions — •Matthias Vojta — Technische Universität Dresden, Germany

This tutorial will cover theoretical concepts and ideas for the description of quantum phase transitions. Starting from order parameters and order-parameter field theories, it will discuss critical exponents and scale invariance, the fascinating interplay of classical and quantum mechanical fluctuations at finite temperatures, and the quantum-to-classical correspondence. Further topics will include interaction-driven metal-insulator transitions, topological phase transitions, and the role of quenched disorder. Throughout the talk, microscopic models will be used for illustration.