Large-scale semi-empirical pseudopotential electronic structure of self-assembled ingaas quantum dots
Author
Kahraman, Mustafa
Advisor
Bulutay, Ceyhun
Date
2018-09Publisher
Bilkent University
Language
English
Type
ThesisItem Usage Stats
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Abstract
The so-called second quantum revolution emerged at the beginning of the second
millennium, opening up a path to realization of spin-qubit-based quantum
computing by means of controlling and protecting quantum coherent processes.
Thus, along this spirit, the self-assembled quantum dots (SAQD) made a transition
from conventional optoelectronic devices to spin-qubit applications. One
specific problem that can benefit from this is the electron spin resonance (ESR)
of a single-electron in a SAQD which could not be reproduced after its demonstration
for more than ten years. The lack of insight for the electronic structure
of SAQDs and g-factors changing with its properties might be the underlying
reason for the decade-old puzzle. Towards the goal of understanding the ESR,
atomistic large-scale semi-empirical electronic structures of InGaAs SAQDs having
different shapes, sizes and indium concentrations are calculated using linear
combination of bulk bands method. Two approaches to extract envelopes of the
wave functions are demonstrated since the resulting wave functions have the fast
uctuations and understanding them might not be always possible. Calculated
electronic structures and wave functions are compared and were found to be in
agreement with the general theoretical and experimental findings paving the way
to the calculation of g-factors in accordance with our eventual aim.
Keywords
InGaAs Quantum DotsElectronic Structure
Semi-Empirical Pseudopotential
Linear Combination Of Bulk Bands