Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-12-04
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, no figures
Scientific paper
10.1103/PhysRevLett.95.137001
In a system with strong local repulsive interactions it should be more difficult to add an electron than to extract one. We make this idea precise by deriving various exact sum rules for the one-particle spectral function independent of the details of the Hamiltonian describing the system and of the nature of the ground state. We extend these results using a variational ansatz for the superconducting ground state and low lying excitations. Our results shed light on the striking asymmetry in the tunneling spectra of high Tc superconductors and should also be useful in estimating the local doping variations in inhomogeneous materials.
Randeria Mohit
Sensarma Rajdeep
Trivedi Nandini
Zhang Fu Chun
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