Tags: NEGF

Description

The non-equilibrium Greens function (NEGF) formalism provides a powerful conceptual and computational framework for treating quantum transport in nanodevices. It goes beyond the Landauer approach for ballistic, non-interacting electronics to include inelastic scattering and strong correlation effects at an atomistic level.

Check out Supriyo Datta's NEGF page for more information, or browse through the various resources listed below.

All Categories (1-20 of 205)

  1. 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....

  2. IWCN 2021: Interfacial Trap Effects in InAs Gate-all-around Nanowire Tunnel Field- Effect Transistors: First-Principles-Based Approach

    15 Jul 2021 | | Contributor(s):: Hyeongu Lee, SeongHyeok Jeon, Cho Yucheol, Mincheol Shin

    In this work, we investigated the effects of the traps, Arsenic dangling bond (AsDB) and Arsenic anti-site (AsIn) traps, in InAs gate-all-around nanowire TFETs, using the trap Hamiltonian obtained from the first-principles calculations. The transport properties were treated by nonequilibrium...

  3. IWCN 2021: Ab initio Quantum Transport Simulation of Lateral Heterostructures Based on 2D Materials: Assessment of the Coupling Hamiltonians

    14 Jul 2021 | | Contributor(s):: Adel Mfoukh, Marco Pala

    Lateral heterostructures based on lattice-matched 2D materials are a promising option to design efficient electron devices such as MOSFETs [1], tunnel-FETs [2] and energy-filtering FETs [3]. In order to rigorously describe the transport through such heterostructures, an ab-initio approach based...

  4. IWCN 2021: Thermoelectric Properties of Complex Band and Nanostructured Materials

    14 Jul 2021 | | Contributor(s):: Neophytos Neophytou, Patrizio Graziosi, Vassilios Vargiamidis

    In this work, we describe a computational framework to compute the electronic and thermoelectric transport in materials with multi-band electronic structures of an arbitrary shape by coupling density function theory (DFT) bandstructures to the Boltzmann Transport Equation (BTE).

  5. Recursive algorithm for NEGF in Python GPU version

    02 Feb 2021 | | Contributor(s):: Ning Yang, Tong Wu, Jing Guo

    This folder contains two Python functions for GPU-accelerated simulation, which implements the recursive algorithm in the non-equilibrium Green’s function (NEGF) formalism. Compared to the matlab implementation [1], the GPU version allows massive parallel running over many cores on GPU...

  6. Compact NEGF-Based Solver for Double-Gate MOSFETs

    17 Nov 2020 | | Contributor(s):: Fabian Hosenfeld, Alexander Kloes

    Fast simulation of the DC current in a nanoscale double-gate MOSFET including thermionic emission and source-to-drain tunneling current.

  7. 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.

  8. Bandgap Manipulation of Armchair Graphene nanoribbon

    01 Sep 2020 | | Contributor(s):: Lance Fernandes

    Bandgap Manipulation is very important for various applications. Optical Devices need smaller Bandgap where as Diode's need larger Bandgap. Armchair graphene Nanoribbon (AGNR) has a special property where if the numbers of atoms are multiple of three or multiple of three plus one, they are...

  9. Transition to Atomic Wire Electrode Actuates Gold-thiol Spin Valve

    04 Aug 2020 | | Contributor(s):: Avinash Prakash

    In resemblance of the mechanically-controlled break junction, we considered the molecule 1,4-benzenedithiol (1,4-BDT) making ohmic contacts with gold in three distinct configurations of the gold electrodes. Simulations of non-equilibrium charge transport within density functional theory,...

  10. Bandstructure Effects in Nano Devices With NEMO: from Basic Physics to Real Devices and to Global Impact on nanoHUB.org

    08 Mar 2019 | | Contributor(s):: Gerhard Klimeck

    This presentation will intuitively describe how bandstructure is modified at the nanometer scale and what some of the consequences are on the device performance.

  11. Biswajit Pabi

    https://nanohub.org/members/197649

  12. Niger Sultana Mimi

    Self motivated learner.

    https://nanohub.org/members/185634

  13. Non-linear Poisson eq. convergence issue for self-consistent calculation in NEGF

    Closed | Responses: 0

    Hi,

    I was working on Prof. S. Datta's code (https://nanohub.org/resources/19564) for 1D diode. I find the convergence rate is highly sensitive to the initial guess, although...

    https://nanohub.org/answers/question/1888

  14. NEMO5, a Parallel, Multiscale, Multiphysics Nanoelectronics Modeling Tool: From Basic Physics to Real Devices and to Global Impact on nanoHUB.org

    10 Nov 2016 | | Contributor(s):: Gerhard Klimeck

    The Nanoelectronic Modeling tool suite NEMO5 is aimed to comprehend the critical multi-scale, multi-physics phenomena and deliver results to engineers, scientists, and students through efficient computational approaches. NEMO5’s general software framework easily includes any kind of...

  15. NEMO5, a Parallel, Multiscale, Multiphysics Nanoelectronics Modeling Tool

    19 Sep 2016 | | Contributor(s):: Gerhard Klimeck

    The Nanoelectronic Modeling tool suite NEMO5 is aimed to comprehend the critical multi-scale, multi-physics phenomena and deliver results to engineers, scientists, and students through efficient computational approaches. NEMO5’s general software framework easily includes any kind of...

  16. Atomistic Modeling of Nano Devices: From Qubits to Transistors

    13 Apr 2016 | | Contributor(s):: Rajib Rahman

    In this talk, I will describe such a framework that can capture complex interactions ranging from exchange and spin-orbit-valley coupling in spin qubits to non-equilibrium charge transport in tunneling transistors. I will show how atomistic full configuration interaction calculations of exchange...

  17. 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...

  18. MATLAB codes from the "Lessons from Nanoelectronics"

    10 Dec 2015 | | Contributor(s):: Supriyo Datta

    The .zip archive contains all the codes from the book.You can download and unzip the file to access the codes organized in folders (titled by the Lecture number).You can run this on MATLAB or use the OCTAViEw tool on nanoHUB.

  19. Phonon Interactions in Single-Dopant-Based Transistors: Temperature and Size Dependence

    25 Nov 2015 | | Contributor(s):: Marc Bescond, Nicolas Cavassilas, Salim Berrada

    IWCE 2015 presentation. in this work we investigate the dependence of electron-phonon scattering in single dopant-based nanowire transistor with respect to temperature and dimensions. we use a 3d real-space non-equilibrium green': ; s function (negf) approach where electron-phonon...

  20. Mode Space Tight Binding Model for Ultra-Fast Simulations of III-V Nanowire MOSFETs and Heterojunction TFETs

    13 Nov 2015 | | Contributor(s):: Aryan Afzalian, Jun Huang, Hesameddin Ilatikhameneh, Santiago Alonso Perez Rubiano, Tillmann Christoph Kubis, Michael Povolotskyi, Gerhard Klimeck

    IWCE 2015 presentation.  we explore here the suitability of a mode space tight binding algorithm to various iii-v homo- and heterojunction nanowire devices. we show that in iii-v materials, the number of unphysical modes to eliminate is very high compared to the si case previously reported...