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Event 

Title:
Vladimir Dobrosavljevic (Florida State e NHMFL - EUA): Quantum Critical Transport
When:
10.06.2013 11.00 h
Where:
Sala de reuniões (antiga sala da Biblioteca) - 1P - Niterói
Category:
Seminários

Description

Seminários do grupo de Matéria Condensada Teórica

 

Título: Quantum Critical Transport near the Mott Transition
Local: antiga sala da biblioteca
Horário: 11h - segunda-feira (10/6).
 
Palestrante: Vladimir Dobrosavljevic (Florida State e NHMFL - EUA)
 
Resumo: According to early ideas of Mott and Anderson, however, the interaction-driven metal-insulator transition – the Mott transition – remains a sharp T=0 phase transition even in absence of any uniform ordering across the transition region. Should this phase transition be regarded as a quantum critical point? To address this question, here we examine [1-3] the phase diagram and transport properties of the maximally frustrated half-filled Hubbard model, in the framework of dynamical mean-field theory (DMFT). We identify a “quantum Widom line” (QWL) which defines the center of the corresponding quantum critical region associated with Mott metal-insulator transition in this model. The evolution of resistivity with temperature is then evaluated along trajectories following (parallel to) the QWL, producing a family of curves with characteristic “fan-like” shape, displaying remarkable scaling behavior characteristic of quantum criticality. Precisely such behavior was found both in very recent experiments on organic Mott systems, and earlier experiments on diluted two-dimensional electron
gases in silicon [3]. 
[1] H. Terletska, et al., Phys. Rev. Lett. 107, 026401 (2011). 
[2] J. Vucicevic, et al., preprint, arXiv1210.7201. 
[3] M. M. Radonjic, et al., Phys. Rev. B 85, 085133 (2012)

Venue

Map
Group:
Sala de reuniões (antiga sala da Biblioteca) - 1P
Street:
Instituto de Física, andar 1P
ZIP:
24210-346
City:
Niterói
Country:
Country: br

Description

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