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Journal Article

Green's function calculation of Ballistic Electron Emission Microscopy currents (BEEM v2.1)

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Reuter, K., de Andresa, P. L., Garcia-Vidal, F. J., Sestovic, D., Flores, F., & Heinz, K. (2000). Green's function calculation of Ballistic Electron Emission Microscopy currents (BEEM v2.1). Computer Physics Communications, 127(2-3), 327-342. doi:10.1016/S0010-4655(99)00502-0.

Cite as: https://hdl.handle.net/21.11116/0000-000A-EE68-6
We describe the FORTRAN-90 program BEEM v2.1 for the computation of real and reciprocal space currents in Ballistic Electron Emission Microscopy (BEEM), and Spectroscopy (BEES). Based on a LCAO Hamiltonian, the equilibrium one-particle Green's functions of a semi-infinite crystal are obtained using a decimation technique. By means of Keldysh's formalism, the STM tip is coupled to this crystal, and expressions for BEEM currents in real and reciprocal space are obtained. Finally, a Dyson-like equation and a self-consistent charge neutrality condition are applied to incorporate reconstructed or relaxed layers in the surface region. Running demos for Au and CoSi2 are provided.