Büttiker probes and the recursive Green's function: An efficient approach to include dissipation in general configurations

Abstract

An efficient and compact approach to the inclusion of dissipative effects in nonequilibrium Green's function (NEGF) simulations of electronic systems is introduced. The algorithm is based on two well-known methods in the literature, first that of the so-called recursive Green's function (RGF) and second that of Büttiker probes. Numerical methods for exact evaluation of the Jacobian are presented by a direct extension to RGF which can be modularly included in any codebase that uses it presently. Then using both physical observations and numerical methods, the computation time of the Büttiker probe Jacobian is improved significantly. An improvement to existing phonon models within Büttiker probes is then demonstrated in the simulation of fully atomistic graphene nanoribbon based field effect transistors in n-i-n and p-i-n operation.