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Electron transport in ultra-thin films and ballistic electron emission microscopy

2017; IOP Publishing; Volume: 29; Issue: 11 Linguagem: Inglês

10.1088/1361-648x/aa575e

1361-648X

Yann Claveau, S. Di Matteo, P. L. de Andrés, F. Florès,

Quantum and electron transport phenomena

We have developed a calculation scheme for the elastic electron current in ultra-thin epitaxial heterostructures. Our model uses a Keldysh's non-equilibrium Green's function formalism and a layer-by-layer construction of the epitaxial film. Such an approach is appropriate to describe the current in a ballistic electron emission microscope (BEEM) where the metal base layer is ultra-thin and generalizes a previous one based on a decimation technique appropriated for thick slabs. This formalism allows a full quantum mechanical description of the transmission across the epitaxial heterostructure interface, including multiple scattering via the Dyson equation, which is deemed a crucial ingredient to describe interfaces of ultra-thin layers properly in the future.