Quantum Phase Transitions and Correlated Electrons

Details Quantum Phase Transitions and Correlated Electrons Quantum Phase Transitions and Correlated Electrons

2003-02-06

arxiv.org/abs/cond-mat/0302110v2

APCTP Bulletin 11-12, 7-12 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

15 pages, 3 figures; published version

Scientific paper

This article is aimed at a pedagogical introduction to the physics of quantum phase transitions that is unique to metallic systems. It has been recognized for some time that quantum criticality can result in a breakdown of Landau's Fermi liquid theory. Its converse, however, has not been appreciated until very recently: non-Fermi liquid behavior can in turn lead to new classes of quantum phase transition. A concrete example is provided by ``local quantum critical points''. I summarize the theoretical reasoning and experimental evidence for local quantum criticality, in the context of heavy fermion metals. The underlying physics is likely to be relevant to other correlated electron systems including doped Mott insulators.

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