title: Particle-hole asymmetry in doped mott insulators: implications for tunneling and photoemission spectroscopies.
abstract: We use exact sum rules for the one-particle spectral function to quantify the idea that it is more difficult to add an electron than to extract one in a system with strong local repulsion. Our results explain the striking asymmetry in the tunneling spectra of underdoped cuprates which increases with underdoping. We also propose a novel method, based on ratios of sum rules, to estimate local density variations in inhomogeneous materials. Using a variational approach, we show that the origin of the particle-hole asymmetry lies in the incoherent spectral weight.
authors.affiliation: Physics Department, The Ohio State University, Columbus, Ohio 43210, USA.
authors.forename: Mohit
authors.initials: M
authors.lastname: Randeria
authors.forename: Rajdeep
authors.initials: R
authors.lastname: Sensarma
authors.forename: Nandini
authors.initials: N
authors.lastname: Trivedi
authors.forename: Fu-Chun
authors.initials: FC
authors.lastname: Zhang