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Dynamical singlets and correlation-assisted Peierls transition in VO2

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arxiv cond-mat/0410005 v1 pith:3CUDVXLA submitted 2004-09-30 cond-mat.str-el

Dynamical singlets and correlation-assisted Peierls transition in VO2

S. Biermann , A. Poteryaev , A. I. Lichtenstein , A. Georges This is my paper
classification cond-mat.str-el
keywords dynamicalcoulombpeierlsphasestrongtemperaturetheorytransition
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A theory of the metal-insulator transition in vanadium dioxide from the high-temperature rutile to the low- temperature monoclinic phase is proposed on the basis of cluster dynamical mean field theory, in conjunction with the density functional scheme. The interplay of strong electronic Coulomb interactions and structural distortions, in particular the dimerization of vanadium atoms in the low temperature phase, plays a crucial role. We find that VO2 is not a conventional Mott insulator, but that the formation of dynamical V-V singlet pairs due to strong Coulomb correlations is necessary to trigger the opening of a Peierls gap.

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