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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Electronic Griffiths Phase of the d=2 Mott Transition

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Author(s):
Andrade, E. C. [1, 2, 3] ; Miranda, E. [1] ; Dobrosavljevic, V. [2, 3]
Total Authors: 3
Affiliation:
[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil
[2] Florida State Univ, Dept Phys, Tallahassee, FL 32306 - USA
[3] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32306 - USA
Total Affiliations: 3
Document type: Journal article
Source: Physical Review Letters; v. 102, n. 20 MAY 22 2009.
Web of Science Citations: 27
Abstract

We investigate the effects of disorder within the T=0 Brinkman-Rice scenario for the Mott metal-insulator transition in two dimensions. For sufficiently weak disorder the transition retains the Mott character, as signaled by the vanishing of the local quasiparticle weights Z(i) and strong screening of the renormalized site energies at criticality. In contrast to the behavior in high dimensions, here the local spatial fluctuations of quasiparticle parameters are strongly enhanced in the critical regime, with a distribution function P(Z)similar to Z(alpha-1) and alpha -> 0 at the transition. This behavior indicates a robust emergence of an electronic Griffiths phase preceding the metal-insulator transition, in a fashion surprisingly reminiscent of the ``infinite randomness fixed point{''} scenario for disordered quantum magnets. (AU)