Particle-Hole Asymmetry in Doped Mott Insulators: Implications for Tunneling and Photoemission Spectroscopies

Mohit Randeria, Rajdeep Sensarma, Nandini Trivedi, and Fu-Chun Zhang
Phys. Rev. Lett. 95, 137001 – Published 19 September 2005

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.

  • Received 7 December 2004

DOI:https://doi.org/10.1103/PhysRevLett.95.137001

©2005 American Physical Society

Authors & Affiliations

Mohit Randeria1, Rajdeep Sensarma1,2, Nandini Trivedi1, and Fu-Chun Zhang3

  • 1Physics Department, The Ohio State University, Columbus, Ohio 43210, USA
  • 2Tata Institute of Fundamental Research, Mumbai 400 005, India
  • 3Physics Department, University of Hong Kong, Hong Kong; Physics Department, University of Cincinnati, Cincinnati, Ohio 45221, USA

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Issue

Vol. 95, Iss. 13 — 23 September 2005

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