Particle-hole asymmetry in doped mott insulators: implications for tunneling and photoemission spectroscopies.
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.
Randeria
Mohit
M
Physics Department, The Ohio State University, Columbus, Ohio 43210, USA.
Sensarma
Rajdeep
R
Trivedi
Nandini
N
Zhang
Fu-Chun
FC