2007/04/30 by Jan M. Tomczak, F. Aryasetiawan, Ferdi Aryasetiawan +1 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Ga2O3 and related materials #Transition Metal Oxide Nanomaterials #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.78.115103
published as Phys. Rev. B 78, 115103 (2008) · 5 pages, 4 color figures
arxiv created 2008/04/12 · openalex publication_date 2008/09/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 quasiparticles, the excitations of the latter allow for an effective bandstructure. We construct an orbital dependent, but static one-particle potential that reproduces the essentials of the full many-body spectrum. Yet, the ground state is well beyond a static one-particle description. The emerging picture gives a nontrivial answer to the decade-old question of the nature of the insulator, which we characterize as a ``many-body Peierls'' state, stressing the joint effect of lattice symmetry breaking and Coulomb correlations.