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LUND UNIVERSITY LIBRARIES

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

Berthilsson, Markus LU (2022) EITM01 20221
Department of Electrical and Information Technology
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. To achieve this, scripts were written in MATLAB
to simulate the nanodevices by applying the non-equilibrium Green’s
function (NEGF) method. To verify the simulations, multiple quantum
phenomena were reproduced in simulations. To reduce the data-size
of the simulation results, a compression algorithm based on the Quite
OK Image Format (QOI) was also developed.
The simulations were able to qualitatively reproduce quantum tun-
neling and quantum point conductance. The simulations showed that
increasing the... (More)
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. To achieve this, scripts were written in MATLAB
to simulate the nanodevices by applying the non-equilibrium Green’s
function (NEGF) method. To verify the simulations, multiple quantum
phenomena were reproduced in simulations. To reduce the data-size
of the simulation results, a compression algorithm based on the Quite
OK Image Format (QOI) was also developed.
The simulations were able to qualitatively reproduce quantum tun-
neling and quantum point conductance. The simulations showed that
increasing the amplitude of the applied potential noise to the nanowire
had a bigger impact on the conductance of a nanowire than the cor-
relation length of the noise. The noise had a smaller impact on the
quantum hall effect than the transmission. Finally the compression
algorithm was able to reduce the data size of the results with a worst
case scenario of 84.9% and best case scenario reaching 97.8% while
having minimal effect on the result. (Less)
Please use this url to cite or link to this publication:
author
Berthilsson, Markus LU
supervisor
organization
course
EITM01 20221
year
type
H2 - Master's Degree (Two Years)
subject
report number
LU/LTH-EIT 2022-903
language
English
id
9103873
date added to LUP
2023-01-18 14:34:01
date last changed
2023-01-18 14:34:01
@misc{9103873,
  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. To achieve this, scripts were written in MATLAB
to simulate the nanodevices by applying the non-equilibrium Green’s
function (NEGF) method. To verify the simulations, multiple quantum
phenomena were reproduced in simulations. To reduce the data-size
of the simulation results, a compression algorithm based on the Quite
OK Image Format (QOI) was also developed.
The simulations were able to qualitatively reproduce quantum tun-
neling and quantum point conductance. The simulations showed that
increasing the amplitude of the applied potential noise to the nanowire
had a bigger impact on the conductance of a nanowire than the cor-
relation length of the noise. The noise had a smaller impact on the
quantum hall effect than the transmission. Finally the compression
algorithm was able to reduce the data size of the results with a worst
case scenario of 84.9% and best case scenario reaching 97.8% while
having minimal effect on the result.}},
  author       = {{Berthilsson, Markus}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Simulating the Effect of Spatial Potential Variation in Nanodevices with the NEGF Method}},
  year         = {{2022}},
}