Thesis supervisor: Gergő Thiering
belső konzulens: Ádám Gali
Location of studies (in Hungarian): Wigner Research Centre for Physics (WIGNER FK) Abbreviation of location of studies: BME
Description of the research topic:
Optically and magnetically active point defect centers in semiconductors may realize as quantum bit candidates for quantum computing. One of the exemplary and most studied centers is the nitrogen vacancy (NV) center in diamond. This system exhibits triplet spin that can be coherently manipulated and the qubit can be read out even at room temperature by optical means. Over the years a plethora of non-characterized defect centers were created in man made diamonds (for example, elementsix of de Beers group) among those there might be ones that possess even better properties than that of NV for quantum technologies. However, the many properties of these defect centers, optical centers, electron paramagnetic resonance (EPR) centers were left unknown in experimental measurements.
Therefore, the PhD student would unravel the physical nature of these defect centers embedded in diamond and other semiconductors (silicon, silicon-carbide, 2 dimensional boron-nitride, etc.) by means of density functional theory (DFT) calculations on the relectronic structure within and beyond the Born-Oppenheimer approximation. The research will be devoted to the characterization of defect centers by providing insight into their electronic structure and thus predict their optically excited states and quantify their radiative and non-radiative relaxation processes. Additionally, other interactions may also govern the physical processes of defect centers: spin-orbit coupling, hyperfine coupling, spin-spin interaction, electron-phonon and spin-phonon coupling, Jahn-Teller instability – all of them may be a key element for actual qubit realizations yet not all of them can be simply measured by experimental means.
Therefore, the results may contribute for realization of qubits in solids or greatly improve the already known defect centers by optimization. Additionally, the PhD student may develop and improve the ab-initio codes and apply them on the selected defect centers of the Research Topic. These studies will be carried out in close collaboration with domestic and international partners (Princeton University or University of Wisconsin-Madison for example). The ab-initio calculations will be run on the computer cluster. The research group that research group is simultaneously split between BME “FA” building and Wigner RCP.
Required language skills: english Number of students who can be accepted: 1
Deadline for application: 2024-05-31
2024. IV. 17. ODT ülés Az ODT következő ülésére 2024. június 14-én, pénteken 10.00 órakor kerül sor a Semmelweis Egyetem Szenátusi termében (Bp. Üllői út 26. I. emelet).
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