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Frontiers of Physics in China

, Volume 5, Issue 4, pp 369–379 | Cite as

First-principles modelling of scanning tunneling microscopy using non-equilibrium Green’s functions

  • Haiping Lin (林海平)
  • Janosch M. C. Rauba
  • Kristian S. Thygesen
  • Karsten W. Jacobsen
  • Michelle Y. Simmons
  • Werner A. Hofer
Review Article

Abstract

The investigation of electron transport processes in nano-scale architectures plays a crucial role in the development of surface chemistry and nano-technology. Experimentally, an important driving force within this research area has been the concurrent refinements of scanning tunneling microscopy (STM) techniques. The theoretical treatment of the STM operation has traditionally been based on the Bardeen and Tersoff-Hamann methods which take as input the single-particle wave functions and eigenvalues obtained from finite cluster or slabs models of the surface-tip interface. Here, we present a novel STM simulation scheme based on non-equilibrium Green’s functions (NEGF) and Wannier functions which is both accurate and very efficient. The main novelty of the scheme compared to the Bardeen and Tersoff-Hamann approaches is that the coupling to the infinite (macroscopic) electrodes is taken into account. As an illustrating example we apply the NEGF-STM method to the Si(001)-(2×1):H surface with sub-surface P doping and discuss the results in comparison to the Bardeen and Tersoff-Hamann methods.

Keywords

STM simulation non-equilibrium Green’s function Wannier function 

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Copyright information

© Higher Education Press and Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • Haiping Lin (林海平)
    • 1
  • Janosch M. C. Rauba
    • 2
  • Kristian S. Thygesen
    • 2
  • Karsten W. Jacobsen
    • 2
  • Michelle Y. Simmons
    • 3
  • Werner A. Hofer
    • 1
  1. 1.Surface Science Research CentreThe University of LiverpoolLiverpoolUK
  2. 2.Center for Atomic-scale Materials DesignTechnical University of DenmarkLyngbyDenmark
  3. 3.Centre of Quantum Computer Technology, School of PhysicsThe University of New South WalesSydneyAustralia

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