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The disordered Mott metal-insulator transition文档
The disordered Mott metal-insulator
transition
Eduardo Miranda
University of Campinas, Brazil
DanielDaniel C.C. B.B. MirandaMiranda
Martha Y. Suárez Villagrán Campinas, Brazil
Eric C. Andrade
Marcelo Rozenberg (Université Paris-Sud, Orsay, France)
EPSRC Symposium Workshop on Quantum Simulations
University of Warwick, August 25, 2009
The Mott-Hubbard transition: beating Bloch’s
theorem
Neville Mott
Localization by interaction: the price paid in kinetic energy by
localizing a quantum particle is compensated by the having the
electrons avoid each other and interact less.
Coulomb repulsion
one electron per site Kinetic energy
“Mott-Hubbard
turtles”
CuSO .5H O
4 2
Mott insulators:
NiO, MnO, V O
2 3
The Mott transition
(V Cr ) O under pressure (P. Limelette et al., Science 302, 89 (2003)).
0.989 0.011 2 3
(V Cr ) O
0.989 0.011 2 3
Hysteresis: metal-insulator coexistence, first-order transition (like liquid-gas)
The Mott transition: other examples
k-(ET)2Cu[N(CN)2]Cl NiS Ni(S Se )
2 1-x x 2
Takagi’s group
Kanoda, J. Phys. Soc. Jpn. 75, 051007 (2006)
H
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