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