Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-03-08
Phys. Rev. B 84, 115101 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 2 figures, Published version
Scientific paper
10.1103/PhysRevB.84.115101
We develop here a general formalism for multi-orbital Mott systems which can be used to understand dynamical and static spectral weight transfer. We find that the spectral weight transferred from the high energy scales is greatly increased as a result of the multi-orbital structure. As a consequence certainly dynamically generated symmetries obtain at lower values of doping than in the single-band Hubbard model. For example, in the atomic limit, the particle-hole symmetric condition in the lower band shifts from the one-band result of $x=1/3$ to $x=1/(2n_o+1)$, where $n_o$ is the number of orbitals with an unpaired spin. Transport properties computed from effective low-energy theories which forbid double occupancy of bare electrons, such as the multi-orbital t-J generalization, should all be be sensitive to this particle-hole symmetric condition. Away from the atomic limit, the dynamical contributions increase the transferred spectral weight. Consequently, any phenomena which are sensitive to an emergent particle-hole symmetry should obtain at $x<(1/(2n_o+1)$.
Lee Wei-Cheng
Phillips Philip W.
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