Essays about: "WKB-approximation"

Found 4 essays containing the word WKB-approximation.

1. 1. Thermoelectric measurements on InAs nanowires with a ratchet-barrier

   University essay from Lunds universitet/Fysiska institutionen; Lunds universitet/Fasta tillståndets fysik

   Author : Hanna Lundström; [2022]
   Keywords : Physics and Astronomy;

   Abstract : Efficient extraction of thermal energy from electrons at the micro- and nanoscale is a long-standing scientific goal that could enable novel types of heat engines, heat management, and solar cell applications. Semiconductor nanowires are a promising system for investigating such devices for several reasons, such as their thermoelectric properties, and the potential to be grown in heterostructures with high flexibility. READ MORE

3. 2. Simulations of current transport phenomena in ferroelectric tunnel junctions

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

   Author : Ivan Lubar; [2022]
   Keywords : Technology and Engineering;

   Abstract : Ferroelectric memories pose as a potential candidate as resistive memory devices that could be used for in-memory computing and artificial synapses. One promising type of ferroelectric memory device is the ferroelectric tunnel junction (FTJ). READ MORE

4. 3. Periodic and Non-Periodic Filter Structures in Lasers

   University essay from KTH/Matematik (Avd.)

   Author : Leo Enge; [2020]
   Keywords : Laser; Grating Filters; Perturbation Theory; WKB Approximation; Bi-cubic Splines; Laser; optiska filter; störningsteori; WKB-approximation; bi-kubiska splines;

   Abstract : Communication using fiber optics is an integral part of modern societies and one of the most important parts of this is the grating filter of a laser. In this report we introduce both the periodic and the non-periodic grating filter and discuss how there can be resonance in these structures. READ MORE

5. 4. Simulation and analysis of InP/GaInP nanowire Esaki diodes for photovoltaic device applications

   University essay from Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

   Author : Odd Restad; [2017]
   Keywords : Physics and Astronomy; Technology and Engineering;

   Abstract : In this thesis the WKB-approximation is used to simulate the tunneling current for an Esaki nanowire diode and the result is compared to data from Esaki nanowire diodes grown with MOVPE. The WKB-approximation with triangular potential barrier predicts a strong increase of the tunneling current as a function of the doping densities and at the highest doping levels it gives lower tunneling distances than more reliable drift-diffusion simulations and is thus overestimating the current. READ MORE