Wobben, Hans Douwe (2022) Modeling quantum diffusion in linear aggregates coupled to colored noise baths. Bachelor's Thesis, Physics.
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Abstract
During photosynthesis, photon energy is absorbed by chromophore molecules, causing electronic excitations. The excitation energy is then transported across molecules to the reaction center. Photosynthetic organisms accomplish this extremely efficiently, exceeding 90%. The prospect of better solar cell efficiency has driven the development of artificial light-harvesting systems. The excitation energy transport (EET) is quan- tum mechanical in nature and arises from the complex interplay of the chromophores and their environment. Current theories can explain EET in the weak and strong system-environment coupling regimes quite well, however in the intermediate regime the EET is much less understood. This research investigates the effect of white and colored noise environments on the excitation diffusion by simulating linear 1D ag- gregates using the white noise Haken-Strobl-Reineker (HSR) model and the colored noise Numerical integration of the Schrödinger equation (NISE) model. While the two models produce similar results in some parameter regimes, in general the difference is significant. Due to the colored noise, the NISE model has an extra parameter that causes rich behavior compared to the HSR model. The results therefore show that the addition of colored noise is crucial. Thus, even though NISE method is computa- tionally more expensive than the HSR model it is worth investigating further.
| Item Type: | Thesis (Bachelor's Thesis) |
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| Supervisor name: | Jansen, T.L.C. and Borschevsky, A. |
| Degree programme: | Physics |
| Thesis type: | Bachelor's Thesis |
| Language: | English |
| Date Deposited: | 11 Jul 2022 10:23 |
| Last Modified: | 11 Jul 2022 10:23 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/27743 |
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