Quantum critical "opalescence" around metal-insulator transitions

Takahiro Misawa, Youhei Yamaji, Masatoshi Imada

研究成果: Article査読

21 被引用数 (Scopus)

抄録

Divergent carrier-density fluctuations equivalent to the critical opalescence of gas-liquid transition emerge around a metal-insulator critical point at a finite temperature. In contrast to the gas-liquid transitions, however, the critical temperatures can be lowered to zero, which offers a challenging quantum phase transition. We present a microscopic description of such quantum critical phenomena in two dimensions. The conventional scheme of phase transitions by Ginzburg, Landau, and Wilson is violated because of its topological nature. It offers a clear insight into the criticalities of metal-insulator transitions (MIT) associated with Mott or charge-order transitions. Fermi degeneracy involving the diverging density fluctuations generates emergent phenomena near the endpoint of the first-order MIT and must shed new light on remarkable phenomena found in correlated metals such as unconventional cuprate superconductors. It indeed accounts for the otherwise puzzling criticality of the Mott transition recently discovered in an organic conductor. We propose to accurately measure enhanced dielectric fluctuations at small wave numbers.

本文言語English
論文番号083705
ジャーナルjournal of the physical society of japan
75
8
DOI
出版ステータスPublished - 2006 8
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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