Effective band-structure in the insulating phase versus strong dynamical correlations in metallic VO2

Details Effective band-structure in the insulating phase versus strong dynamical correlations in metallic VO2 Effective band-structure in the insulating phase versus strong dynamical correlations in metallic VO2

2007-04-06

arxiv.org/abs/0704.0902v2

Phys. Rev. B 78, 115103 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 color figures

Scientific paper

10.1103/PhysRevB.78.115103

Using a general analytical continuation scheme for cluster dynamical mean field calculations, we analyze real-frequency self-energies, momentum-resolved spectral functions, and one-particle excitations of the metallic and insulating phases of VO2. While for the former dynamical correlations and lifetime effects prevent a description in terms of quasi-particles, the excitations of the latter allow for an effective band-structure. We construct an orbital-dependent, but static one-particle potential that reproduces the full many-body spectrum. Yet, the ground state is well beyond a static one-particle description. The emerging picture gives a non-trivial answer to the decade-old question of the nature of the insulator, which we characterize as a ``many-body Peierls'' state.

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