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IWCN 2021: How to Preserve the Kramers-Kronig Relation in Inelastic Atomistic Quantum Transport Calculations
15 Jul 2021 | | Contributor(s):: Daniel Alberto Lemus, James Charles, Tillmann Christoph Kubis
The nonequilibrium Green’s function method (NEGF) is often used to predict quantum transport in atomically resolved nanodevices. This yields a high numerical load when inelastic scattering is included. Atomistic NEGF had been regularly applied on nanodevices, such as nanotransistors....
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Atomistic Green’s Functions: The Beauty of Self-energies
28 Oct 2020 | | Contributor(s):: Tillmann Christoph Kubis
This presentation gives an introduction to NEGF. It will be explained how self-energies cause NEGF to fundamentally differ from most other quantum methods. Atomistic examples of phonon and impurity scattering self-energies agree quantitatively with experiments.
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Self-energies: Opening Doors for Nanotechnology
07 Apr 2016 | | Contributor(s):: Tillmann Christoph Kubis
In this talk, it will be shown how the concept of self-energies can be used to interface all these fields into the same nanotechnology modeling framework. Self-energies are most commonly used in the quantum transport method of nonequilibrium Green’s functions (NEGF). The NEGF method is...
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How to consider electron-photon interaction w/o using self-energy?
Q&A|Closed | Responses: 0
Hi,
In negf, interactions are considered as self-energies. For electron-photon interaction, a perturbation Hamiltonian is derived and then self-energy is found using coupled-field theory. Now,...
https://nanohub.org/answers/question/799
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Berkeley GW
27 Sep 2009 | | Contributor(s):: Alexander S McLeod, Peter Doak, Sahar Sharifzadeh, Jeffrey B. Neaton
This is an educational tool that illustrates the calculation of the electronic structure of materials using many-body perturbation theory within the GW approximation
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Surface scattering: Made simple
03 Sep 2010 | | Contributor(s):: Dmitri Nikonov, Himadri Pal
Surface scattering in a quantum well.
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Scattering in NEGF: Made simple
09 Nov 2009 | | Contributor(s):: Dmitri Nikonov, Himadri Pal, George Bourianoff
Formalism for describing electron-phonon scattering, surface scattering, and spin relaxation is dervied for the Keldysh non-equilibrium Green's functions (NEGF) method. Approximation useful for efficient numerical solution are described. The specific case of the nanoMOS simulator is...
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Lecture 2: Graphene Fundamentals
17 Sep 2009 | | Contributor(s):: Supriyo Datta
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Matdcal
30 Jan 2008 | | Contributor(s):: Kirk Bevan
Non-equilibrium Green's Function Density Functional Theory Simulator