Simulating the effect of structural imperfections on nanowire transport properties using kwant
(2021) FYSM30 20211Mathematical Physics
Department of Physics
- Abstract
- Conductance was calculated for trapezoidal nanowires with different forms and strengths of imperfection using kwant, a quantum transport software package that uses a tight-binding model. In this thesis it is found that increasing magnitudes of different imperfections such as surface charge and roughness roughen conductance steps, introduce resonances, and lower conductance overall with different character of these effects for different types of imperfections. Quantitative qualification of the effect on conductance is calculated in the form of exponential fits for Urbach tails, showing a more gradual increase in conductance as the strength of imperfections increases. These results show how different imperfections can affect transport... (More)
- Conductance was calculated for trapezoidal nanowires with different forms and strengths of imperfection using kwant, a quantum transport software package that uses a tight-binding model. In this thesis it is found that increasing magnitudes of different imperfections such as surface charge and roughness roughen conductance steps, introduce resonances, and lower conductance overall with different character of these effects for different types of imperfections. Quantitative qualification of the effect on conductance is calculated in the form of exponential fits for Urbach tails, showing a more gradual increase in conductance as the strength of imperfections increases. These results show how different imperfections can affect transport properties in nanowires, and provide insight which can help provide a more concrete theoretical understanding of the transport-imperfection relationship as well as aid the design and characterisation of next-generation nanowire devices. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9057906
- author
- Pallaris, Alexandros LU
- supervisor
-
- Erik Lind LU
- Peter Samuelsson LU
- organization
- course
- FYSM30 20211
- year
- 2021
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- nanowire, conductance, imperfection, electron transport, quantum transport, tight-binding model
- language
- English
- additional info
- I can be contacted at 'firstnamelastname at yahoo.ca'.
- id
- 9057906
- date added to LUP
- 2021-06-23 11:06:26
- date last changed
- 2021-06-24 12:52:25
@misc{9057906, abstract = {{Conductance was calculated for trapezoidal nanowires with different forms and strengths of imperfection using kwant, a quantum transport software package that uses a tight-binding model. In this thesis it is found that increasing magnitudes of different imperfections such as surface charge and roughness roughen conductance steps, introduce resonances, and lower conductance overall with different character of these effects for different types of imperfections. Quantitative qualification of the effect on conductance is calculated in the form of exponential fits for Urbach tails, showing a more gradual increase in conductance as the strength of imperfections increases. These results show how different imperfections can affect transport properties in nanowires, and provide insight which can help provide a more concrete theoretical understanding of the transport-imperfection relationship as well as aid the design and characterisation of next-generation nanowire devices.}}, author = {{Pallaris, Alexandros}}, language = {{eng}}, note = {{Student Paper}}, title = {{Simulating the effect of structural imperfections on nanowire transport properties using kwant}}, year = {{2021}}, }