Quantum dots and quantum dot based polymer composites tara. I declare that the work contained in this thesis submitted by me for the degree of master of science by research is my own work, except where due reference is made to other authors, and has not previously been submitted by me for a degree at this or any other university. Quantum dots and silica dots a thesis presented to the faculty of the graduate school of cornell university in partial fulfillment of the requirements for the degree of master of science by diana lynne bull august 2004. Cavity quantum electrodynamics with quantum dots in microcavities. Highperformance silicon nanowire electronics ruogu huang. Date lawrence rees, advisor date eric hintz, research coordinator date ross l. Brigham young university department approval of a senior thesis submitted by je. Ucc library and ucc researchers have made this item openly. Dissertation to obtain the degree of doctor at the university of twente. Photons are natural carriers of quantum information due to their ease of distribution and long lifetime.
Modeling of pin quantum dots qds solar cell the previous pin structure is used as the structure of quantum dot solar cell qdsc in this simulation. Murphy department of electrical and computer engineering this thesis investigates nonlinear effects in semiconductor waveguides for optical signal processing. Fewcycle nearinfrared pulses from a degenerate 1 ghz optical parametric oscillator richard a. Quantum dots are so tiny that the electrons within them exist only in states with specific energies.
The ions are trapp ed in a linear p aul trap, co oled and excited b y laser ligh t, observ ed detection of their uorescence on a photon coun ting photom ultiplier and on a highly. Synthesis, surface treatment, and characterization of copper. As such, quantum dots behave similarly to atoms, and, like atoms, can achieve higher levels of. Synthesis of cadmium selenide quantum dots and their cytotoxicity. Quantum dots and quantum dot based polymer composites. However, all masters students must conduct some sort of research or project. Diploma thesis atomistic modeling of an experimental gaasingaas quantum dot molecule using nemo 3d yuihong matthias tan in partial fulfillment of the requirements for the degree diplomingenieur dipl. The need for less toxic quantum dots qds has led to a significant number of investigations related to copper indium sulfide cis qds. Quantum dots may also be multicomponent dots which include. Ulrich kunze, ruhruniversity bochum september 2010.
As such, quantum dots behave similarly to atoms, and. Type 1 when the nucleus is a narrowband semiconductor with the energy gap inside that of the host material. The last part of this dissertation describes quantum point contacts qpcs which. All electron transfers on a quantum dot take place through tunneling events. Anderson, advisor department of physics and astronomy. Influence of strain on band structure of semiconductor. The quantum dots qds are inserted inside the intrinsic layer which is between the ptype region and ntype region.
Originally, such quantum dots were formed by growing a semiconductor heterostructure a plane of one semiconductor sandwiched between. Optoelectronic and photonic control of single quantum dots. Single quantum dot tracking for quantitative molecular imaging. Quantum dots october 2003 quantum dot, and magnetic metal dots show promise as recording media being pursued by ibm. Single electron transistors and carbon nanotube double quantum. Quantum information processing with single photons. Submitted in partial fulfillment of the requirements for the. Topdown etched sitecontrolled ingangan quantum dots. A thesis submitted to the university of manchester for the degree of doctor of philosophy in the faculty of engineering and physical science 2014 edson gardunonolasco school of electrical and electronic engineering. R eid scottish universities physics alliance supa, institute of photonics and quantum sciences, school of engineering and physical sciences, heriotwatt university, riccarton, edinburgh eh14 4as, uk.
These students must write a thesis, which is a large document that is likely to be. This thesis aims at shedding light on the microscopic origin of a phenomenon in the field of semiconductor nanostructures, which occurs in transport through a short and narrow quasi onedimensional constriction, the quantum point contact qpc. Electron spin transport in quantum dots and point contacts phd thesis of erik j. Quantum dots are well suited to study the kondo effect as many parameters. Excited state dynamics in cuins 2 zns quantum dots 4. Quantum dots in semiconductor heterostructures have proven to be excellent systems to study the charge and spin degree of freedom of single electrons 1 as well as coherent manybody processes like the kondo e. Ipiranga, 6681 partenon porto alegrers, 90619900 brasi email. Synthesis of cadmium selenide quantum dots and their.
A templateassisted assembly technique is used to align feo qds into a closepacked, ordered matrix within the trenches that separate highly aligned sinws, and thus store injected charges. Determination of the tunnel rates through a fewelectron. Spin qubits in silicon quantum dots, the focus of this dissertation, can in principle satisfy all of these. Figure 1a illustrates the energy band structure of coreshelled cdsezns quantum dots. Determination of thermal history by photoluminescence of core. This in an introduction on quantum computing and on the use of nmr to build quantum computers, geared towards an nmr audience. Semiconductor waveguides for nonlinear optical signal processing paveen apiratikul, doctor of philosophy, 2009 dissertation directed by. A fowler nordheim tunneling mechanism describes both the program and erase operations. Single electron spin qubits in silicon quantum dots. First section includes the fundamental theories on excitons, trions, phase decoherence, and charge states. Determination of thermal history by photoluminescence of.
The book quantum dots theory and applications collects some new research results in the area of fundamental excitations, decoherence, charge states, epitaxial techniques and photoluminescence experiments related to devices made with quantum dots. May 04, 2015 quantum dots are so tiny that the electrons within them exist only in states with specific energies. Semiconducting coreshelled quantum dots are excellent candidates to permanently record thermal histories that can be read out from optical spectrum. The quantum confinement of the cdse cores depends strongly on its size and the surrounding energy barrier. Modeling and simulation of gasbgaas quantum dot for solar. The thesis presents a novel technique to realise photodetectors where one of the substrates is thinned by chemical mechanical polishing cmp after bonding the sige wafers. Because their unique properties largely stem from their interesting electronic structure, most applications focus on their optical properties. Based on this technique, gesi detectors with remarkably high responsivities, in excess of 3. This thesis presents a systematic study of the physics and quantum control of spins in fewelectron sisige quantum dots. This thesis describes the development of several quantum dot devices.
This thesis presents a viable route towards the implementation of quantum computing. Thesis students will conduct a large research project, which will likely involve several semesters of work. This thesis rep orts on the setup of a new exp erimen tal apparatus for the storage and con trol of strings of calcium ions to b e used for quan tum computation. Scaling aspects of silicon spin qubits tu delft research. Influence of strain on band structure of semiconductor nanaostructures 467 a b fig. The two other approaches create quantum dots at or near the surface of a semiconductor crystal. By integrating a quantum dot into a pindiode, it was possible to control the dominant. Synthesis and characterisation of cuins quantum dots. Fewcycle nearinfrared pulses from a degenerate 1 ghz. Following receptor traffic and membrane topology nathan p. Accounting for atmospheric absorption and transducer directivity trevor jenny a senior thesis submitted to the faculty of brigham young university in partial fulfillment of the requirements for the degree of bachelor of science brian e.
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