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- W3047533441 abstract "The Non-Equilibrium Green Function (NEGF) method was established in the 1960's through the classic work of Schwinger, Kadanoff, Baym, Keldysh and others using many-body perturbation theory (MBPT) and the diagrammatic theory for non-equilibrium processes. Much of the literature is based on the original MBPT-based approach and this makes it inaccessible to those unfamiliar with advanced quantum statistical mechanics. We obtain the NEGF equations directly from a one-electron Schrodinger equation using relatively elementary arguments. These equations have been used to discuss many problems of great interest such as quantized conductance, (integer) quantum Hall effect, Anderson localization, resonant tunneling and spin transport without a systematic treatment of many-body effects. But it goes beyond purely coherent transport allowing us to include phase-breaking interactions (both momentum-relaxing and momentum-conserving as well as spin-conserving and spin-relaxing) within a self-consistent Born approximation. We believe that the scope and utility of the NEGF equations transcend the MBPT-based approach originally used to derive it. NEGF teaches us how to combine quantum dynamics with much as Boltzmann taught us how to combine classical dynamics with contacts, using the word contacts in a broad, figurative sense to denote all kinds of entropy-driven processes. We believe that this approach to contact-ing the Schrodinger equation should be of broad interest to anyone working on device physics or non-equilibrium statistical mechanics in general." @default.
- W3047533441 created "2020-08-10" @default.
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- W3047533441 date "2020-08-04" @default.
- W3047533441 modified "2023-10-16" @default.
- W3047533441 title "The Non-Equilibrium Green Function (NEGF) Method" @default.
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