Essays about: "NEGF"

Found 4 essays containing the word NEGF.

1. 1. Electron-skyrmion systems, in and out of equilibrium, and isolated or contacted to reservoirs

   University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

   Author : Emil Adam Jonatan Östberg; [2023]
   Keywords : skyrmion; skyrmions; NEGF; freen s function; quantum transport; non-equlibrium; topology; topological charge; skyrmionics; current induced; open system; Physics and Astronomy;

   Abstract : A Kondo lattice skyrmion model in contact with a macroscopic environment is simulated to explore skyrmion dynamics, which is an extension of previous work. The system is simulated using non-equilibrium Green's functions within the generalized Kadanoff-Baym ansatz and the wide band limit. READ MORE

3. 2. Simulating the Effect of Spatial Potential Variation in Nanodevices with the NEGF Method

   University essay from Lunds universitet/Institutionen för elektro- och informationsteknik

   Author : Markus Berthilsson; [2022]
   Keywords : Technology and Engineering;

   Abstract : In this master thesis nanowires have been simulated to study the effect of spatial imperfections in the nanowires. This spatial imper- fection took the form of potential fluctuations in the conduction band across the wire. READ MORE

4. 3. Green's Functions Investigations in Quantum Transport Geometries

   University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

   Author : Philip Johansson; [2022]
   Keywords : Quantum transport; Green s functions; self-energy; non-equilibrium; many-body physics; Physics and Astronomy;

   Abstract : In this thesis we employ the non-equilibrium Green’s function (NEGF) method to study both finite and infinite systems. We develop a codebase capable of computing the steady state interacting NEGF in open systems, i.e. READ MORE

5. 4. Electric Field Domains in Quantum Cascade Lasers

   University essay from Lunds universitet/Fysiska institutionen; Lunds universitet/Matematisk fysik

   Author : Tim Almqvist; [2017]
   Keywords : quantum cascade laser; QCL; electric field domain; EFD; NDR; negative differential resistivity; simulations; Tim; Almqvist; kvantkaskadlaser; Physics and Astronomy;

   Abstract : Quantum cascade lasers (QCLs) are periodic semiconductor heterostructures, capable of producing laser gain. They have become an important source of coherent radiation in the mid infrared, and THz frequency regions. QCLs are non-linear electric devices, and often have bias regions of negative differential resistivity (NDR). READ MORE