2002年12月
Strongly coupled quantum criticality with a Fermi surface in two dimensions: Fractionalization of spin and charge collective modes
PHYSICAL REVIEW B
- ,
- 巻
- 66
- 号
- 23
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.66.235117
- 出版者・発行元
- AMER PHYSICAL SOC
We describe two-dimensional models with a metallic Fermi surface which display quantum phase transitions controlled by strongly interacting critical field theories below their upper critical dimension. The primary examples involve transitions with a topological order parameter associated with dislocations in collinear spin-density-wave ("stripe") correlations: the suppression of dislocations leads to a fractionalization of spin and charge collective modes, and this transition has been proposed as a candidate for the cuprates near optimal doping. The coupling between the order parameter and long-wavelength volume and shape deformations of the Fermi surface is analyzed by the renormalization group, and a runaway flow to a nonperturbative regime is found in most cases. A phenomenological scaling analysis of simple observable properties of possible second-order quantum critical points is presented, with results quite similar to those near quantum spin-glass transitions and to phenomenological forms proposed by Schroder [Nature (London) 407, 351 (2000)].
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevB.66.235117
- ISSN : 2469-9950
- eISSN : 2469-9969
- Web of Science ID : WOS:000180279400053