Thermoelectric transport and thermometry of quantum dots
(2015) PHYM01 20151Department of Physics
Solid State Physics
- Abstract
- Thermoelectricity is the physical principle of converting heat energy directly into electrical energy. Devices based on this principle so far fall short on efficiency but future thermoelectric devices based on QDs can have very high efficiency. Before QDs can be used in actual devices their behavior must the studied to a further extent. This work theoretically explores how a QD in a single electron transistor setup can be characterized from thermoelectric measurements. It is shown how asymmetric tunnel couplings between the QD and the leads, the temperatures of the leads and an applied magnetic field will influence the thermocurrent (electrical current generated by a temperature difference) through the dot.
This work also contains... (More) - Thermoelectricity is the physical principle of converting heat energy directly into electrical energy. Devices based on this principle so far fall short on efficiency but future thermoelectric devices based on QDs can have very high efficiency. Before QDs can be used in actual devices their behavior must the studied to a further extent. This work theoretically explores how a QD in a single electron transistor setup can be characterized from thermoelectric measurements. It is shown how asymmetric tunnel couplings between the QD and the leads, the temperatures of the leads and an applied magnetic field will influence the thermocurrent (electrical current generated by a temperature difference) through the dot.
This work also contains comparisons of a Landauer-Büttiker and a Master equation approach to calculate the current through the QD. For the Master equation approach both infinite lifetime sequential tunneling and a lifetime broadening utilizing Lorentzian distribution functions to account for the widths of the energy levels are used. It is found that the broadening is important to include when calculating the thermopower but it fails at calculating the heat current. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/7358233
- author
- Josefsson, Martin LU
- supervisor
- organization
- course
- PHYM01 20151
- year
- 2015
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- thermoelectricity, quantum dot, QD, quantum transport, solid state physics
- language
- English
- id
- 7358233
- date added to LUP
- 2015-06-18 12:18:22
- date last changed
- 2015-06-18 12:18:22
@misc{7358233, abstract = {{Thermoelectricity is the physical principle of converting heat energy directly into electrical energy. Devices based on this principle so far fall short on efficiency but future thermoelectric devices based on QDs can have very high efficiency. Before QDs can be used in actual devices their behavior must the studied to a further extent. This work theoretically explores how a QD in a single electron transistor setup can be characterized from thermoelectric measurements. It is shown how asymmetric tunnel couplings between the QD and the leads, the temperatures of the leads and an applied magnetic field will influence the thermocurrent (electrical current generated by a temperature difference) through the dot. This work also contains comparisons of a Landauer-Büttiker and a Master equation approach to calculate the current through the QD. For the Master equation approach both infinite lifetime sequential tunneling and a lifetime broadening utilizing Lorentzian distribution functions to account for the widths of the energy levels are used. It is found that the broadening is important to include when calculating the thermopower but it fails at calculating the heat current.}}, author = {{Josefsson, Martin}}, language = {{eng}}, note = {{Student Paper}}, title = {{Thermoelectric transport and thermometry of quantum dots}}, year = {{2015}}, }