Divergent Precursors of the Mott-Hubbard Transition at the Two-Particle Level

Schäfer, T.; Rohringer, G.; Gunnarsson, O.; Ciuchi, S.; Sangiovanni, G.; Toschi, A.

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Divergent Precursors of the Mott-Hubbard Transition at the Two-Particle Level

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Schäfer, T.
Research Group Theory of Strongly Correlated Quantum Matter (Thomas Schäfer), Max Planck Institute for Solid State Research, Max Planck Society;

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Gunnarsson, O.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;
Department Electronic Structure Theory (Ali Alavi), Max Planck Institute for Solid State Research, Max Planck Society;

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Sangiovanni, G.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Toschi, A.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Schäfer, T., Rohringer, G., Gunnarsson, O., Ciuchi, S., Sangiovanni, G., & Toschi, A. (2013). Divergent Precursors of the Mott-Hubbard Transition at the Two-Particle Level. Physical Review Letters, 110(24): 246405.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C66F-7

Abstract

Identifying the fingerprints of the Mott-Hubbard metal-insulator transition may be quite elusive in correlated metallic systems if the analysis is limited to the single particle level. However, our dynamical mean-field calculations demonstrate that the situation changes completely if the frequency dependence of the two-particle vertex functions is considered: The first nonperturbative precursors of the Mott physics are unambiguously identified well inside the metallic regime by the divergence of the local Bethe-Salpeter equation in the charge channel. In the low-temperature limit this occurs for interaction values where incoherent high-energy features emerge in the spectral function, while at high temperatures it is traceable up to the atomic limit.