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Mott p-n junctions in layered materials

M. Charlebois, S. R. Hassan, R. Karan, D. Sénéchal, and A.-M. S. Tremblay
Phys. Rev. B 87, 035137 – Published 29 January 2013

Abstract

The p-n junction has provided the basis for the semiconductor-device industry. Investigations of p-n junctions based on Mott insulators is still in its infancy. Layered Mott insulators, such as cuprates or other transition metal oxides, present a special challenge since strong in-plane correlations are important. Here we model the planes carefully using plaquette cellular dynamical mean field theory with an exact diagonalization solver. The energy associated with interplane hopping is neglected compared with the long-range Coulomb interaction that we treat in the Hartree-Fock approximation. Within this new approach, dynamical layer theory, the charge redistribution is obtained at the final step from minimization of a function of the layer fillings. A simple analytical description of the solution, in the spirit of the Thomas-Fermi theory, reproduces quite accurately the numerical results. Various interesting charge reconstructions can be obtained by varying the Fermi energy differences between both sides of the junction. One can even obtain quasi-two-dimensional charge carriers at the interface, in the middle of a Mott insulating layer. The density of states as a function of position does not follow the simple band bending picture of semiconductors.

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  • Received 22 November 2012

DOI:https://doi.org/10.1103/PhysRevB.87.035137

©2013 American Physical Society

Authors & Affiliations

M. Charlebois1, S. R. Hassan2, R. Karan2, D. Sénéchal1, and A.-M. S. Tremblay1,3

  • 1Département de Physique and RQMP, Université de Sherbrooke, Sherbrooke, QC, Canada
  • 2The Institute of Mathematical Sciences C.I.T. Campus, Chennai 600 113, India
  • 3Canadian Institute for Advanced Research, Toronto, Ontario, Canada

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Issue

Vol. 87, Iss. 3 — 15 January 2013

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