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Optical Control of donor-bound electron and nuclear spins in n-doped semiconductors

Bremer R. (2012) Optical Control of donor-bound electron and nuclear spins in n-doped semiconductors. Master's Thesis / Essay, Physics.

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To perform quantum information processing using electron spin states can be done with localized spin states. In donor doped semiconductors electrons are localized in donor bound electron and bound exciton systems. With the help of polarized optical transitions there can be coherent electron spin states created. The big disadvantage of using donor doped semiconductors is that the decoherence time of the electron spin is very short. So information stored in the electron spin is easily lost. Because of thermal fluctuations of the nuclear spin bath the nuclear forms an important dephasing source. Dynamic Nuclear Polarization (DNP) can be used to reduce these fluctuations of nuclear spins in the spin bath. DNP is the mechanism were electron spin polarization is induced, which leads to nuclear polarization.Therefore understanding the mechanisms that lead to loss of quantum information and controlling these processes is crucial. A Hydrogen model is used to calculate the energy levels of a donor system coupled with multiple nuclei. Coupling the system with different polarizations light can give control over flipping electron spins and possibly over nuclear spins in the spin bath.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Physics
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:50
Last Modified: 15 Feb 2018 07:50

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