Spectral weight transfer in multiorbital Mott systems

Wei-Cheng Lee, Philip W. Phillips
2011 Physical Review B  
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
more » ... 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).
doi:10.1103/physrevb.84.115101 fatcat:xgqmtmziznfjrehjnn6ixxldjy