Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-01-29
Phys. Rev. Lett. 99, 046402 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures. New title, extended references and discussions in the last version
Scientific paper
10.1103/PhysRevLett.99.046402
We develop a nanoscale dynamical mean-field theory (nano-DMFT) to deal with strong Coulomb interaction effects in physical systems that are intermediate in size between atoms and bulk materials, taking into account the tunneling into nearby electrodes. Focusing on a simplified treelike geometry, the usual DMFT loop simply stops when the finite lattice is fully covered, starting with an initial seed provided by the electronic environment at the boundary. To illustrate this nano-DMFT, we investigate the disappearance of the quasiparticle weight in a correlated nano object near the Mott transition. In contrast to thermally driven classical phase transitions, quantum effects lead to unexpected oscillations of the order parameter, related to the interference of coherent renormalized quasiparticles. This behavior also implies a spatially inhomogeneous Mott localization process at the nanoscale.
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