Electronic Griffiths Phase of the d=2 Mott Transition

Autor(es)

Andrade, E. C. ^{[1, 2, 3]} ; Miranda, E. ^[1] ; Dobrosavljevic, V. ^{[2, 3]}

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Physical Review Letters; v. 102, n. 20 MAY 22 2009.
• Citações Web of Science: 27

Resumo

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)

• Processo FAPESP: 04/12098-6 - Cálculos numéricos de sistemas eletrônicos desordenados correlacionados
• Beneficiário: Eric de Castro e Andrade
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto