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Leonid V. Keldysh – one of the most influential theoretical physicists of the 20th century – passed away in November 2016. L. V. Keldysh is best known for the diagrammatic formulation of real‐time (nonequilibrium) Green functions theory and for the theory of strong field ionization of atoms. Both theories profoundly changed large areas of theoretical physics and stimulated important experiments....
A theoretical model for studying elementary processes in vibrational scanning tunneling microscopy/spectroscopy is presented. General formulae for the elastic and inelastic tunneling currents are derived on the basis of the Anderson Hamiltonian coupled to a vibrational degree of freedom. Our treatment includes the vibrational damping due to electron-hole pair excitations. It is found that the non-equilibrium...
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