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Paper   IPM / P / 13937
School of Physics
  Title:   Quasiparticle Mass Enhancement and Fermi Surface Shape Modification in Oxide Two-Dimensional Electron Gases
  Author(s): 
1.  J.R. Tolsma
2.  A. Principi
3.  R. Asgari
4.  M. Polini
5.  A.H. MacDonald
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  93
  Year:  2016
  Pages:   045120
  Supported by:  IPM
  Abstract:
We propose a model intended to qualitatively capture the electron-electron interaction physics of two-dimensional electron gases formed near transition-metal oxide heterojunctions containing t2g electrons with a density much smaller than one electron per metal atom. Two-dimensional electron system of this type can be described perturbatively using a GW approximation which predicts that Coulomb interactions enhance quasiparticle effective masses more strongly than in simple two-dimensional electron gases, and that they reshape the Fermi surface, reducing its anisotropy.

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