Poster Physics@FOM
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Poster of my master\'s research presented at the Physics@FOM conference at Veldhoven on 20 januari 2010. There\'s one error in the equations, can you find it?
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![BCS Theory on Lasing ZnO Nanowires A.J. van Lange 1 , M.A.M. Versteegh 1 , J.I. Dijkhuis 1 , H.T.C. Stoof 2 1 Debye Institute for Nanomaterials Science, Utrecht 2 Institute for Theoretical Physics, Utrecht ,[object Object],[object Object],[object Object],Luminescence Spectra Gain calculations CCD images of a single lasing nanowire with increasing distance from the microscope objective. ZnO nanowires are among the smallest known lasers. In an effort to explain their UV laser action, we have developed a many body theory of the electron hole (e-h) plasma in ZnO. In experiment ZnO nanowires are excited by intense 800-nm 120-fs pulses to create an e-h plasma with high carrier densities. For low carrier densities laser action in ZnO is described by exciton polaritons. In our experiment lasing occurrs above the Mott density, where excitons no longer exist. We study the possibility of a new bound state at high densities: the Cooper pair of an electron and a hole. Our goal is to extract the optical response from the theory and to compare those results to our experiments on ZnO nanowires. Although the theory does not incorporate any finite size effects, nanowires are preferable over bulk in experiment, because their crystalline structure shows very little defects. Introduction BCS theory in an e-h plasma ,[object Object],[object Object],[object Object],[object Object],Angle Averaged Gap Equation This equation can be discretized to , with Assumptions Gallery ,[object Object],[object Object],[object Object],[object Object],[object Object],Future work Screened Coulomb Interaction Figure 1: Angle averaged screened potential at n e = 10 25 m -3 . Value of V0 ≈ 10 -46 Jm -3 . The gap equation is integrated over the angles to yield where is the angle averaged Coulomb interaction . As we lower the temperature, the eigenvalue of U becomes one at the critical temperature. In statistical field theory screening is described by the Bethe-Salpeter equation: Because we are looking at with long wavelength behaviour, we set ω = 0. To find the angle averaged potential , we write and perform the integrals over the angles. In the evaluation of the bubble diagram Fermi-Dirac distributions are approximated by stepfunctions. Here, is the bare Coulomb interaction and the amplitude of the bubble diagram is called . The effective screened interaction is: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Pump-probe measurement Acknowledgements We thank P. Jurrius and C.R. de Kok for technical support and D.H. van Dorp and D.A.M. Vanmaekelbergh for the nanowire samples.](https://image.slidesharecdn.com/veldhovenajvanlangefinal-12659806089952-phpapp02/85/Poster-Physics-FOM-1-320.jpg)
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2) Analysis found the number of dynodes in the photomultiplier tube to be 6.5, and resolution R was determined to be inversely proportional to gamma ray energy as expected.
3) Activity of a potassium chloride sample was estimated using detector efficiency calculations, finding 1.7×10^17 40K nuclei, consistent with the expected amount.
Kinetics of X-ray conductivity for an ideal wide-gap semiconductor irradiated...
This document discusses the development of a kinetic theory to describe the X-ray conductivity (XRC) of semiconductors and dielectrics when irradiated by X-rays. It begins by outlining the need for such a theory and which characteristics it should describe. It then presents the initial stages of developing the theory, including modeling an ideal semiconductor at low excitation levels and deriving expressions for the spatial distribution of free electrons and holes and their lifetimes. The document also examines how the electric field of free charge carriers affects the distributions as excitation increases and considers incorporating the Coulomb interaction between carriers.
electron spin resonance
This document provides an overview of electron spin resonance (ESR) spectroscopy. It discusses how ESR works by applying a magnetic field to induce transitions between electron spin energy levels, which are split due to interactions between unpaired electrons and their environment. Specifically, it describes how orbital interactions and nuclear hyperfine interactions affect the ESR spectrum. It also discusses experimental considerations like microwave frequencies, magnetic field strengths, sensitivity, saturation effects, and nuclear hyperfine interactions. The goal is to provide fundamentals of ESR spectroscopy and introduce its capabilities for studying organic and organometallic radicals and complexes.
хагас дамжуулагчийн физик
Semiconductor theory describes how small amounts of impurities can be added to intrinsic semiconductors to create n-type and p-type materials. N-type semiconductors are created by adding elements with extra electrons, while p-type are created by adding elements with electron deficiencies. The junction between a p-type and n-type material allows current to flow in only one direction, forming the basis for important semiconductor devices such as diodes, transistors, and solar cells.
SERDYUK-Alexandra- NCUR_Poster - COPY
The document discusses research on modeling and experimentally measuring the effects of geometric shape factors on Townsend coefficients in cylindrical containment vessels over a range of pressures. The goal is to better understand electric discharge in gases by resolving disagreements in values of physical quantities called Townsend coefficients that are necessary for predictive modeling. Simulations of Townsend discharge will be conducted and a Langmuir probe will be used to directly measure electron temperatures to separate the effects of geometry from temperature.
Introduction to the phenomenology of HiTc superconductors.
1. The document provides an introduction to the phenomenology of high-temperature superconductors (HiTc).
2. It discusses the basic physics of doped Mott insulators and experimental methods used to study HiTc superconductors such as thermodynamic measurements, transport properties, neutron scattering, and ARPES.
3. It also covers topics such as the pseudo-gap phase, the one-hole problem, properties at small doping levels, and properties of the superconducting state.
The Indices of Refraction of Molecular-Beam Epitaxy–Grown BexZn1–xTe Ternary ...
This document discusses a study that uses a combination of prism-coupling, reflectivity, and ellipsometric techniques to determine the indices of refraction (n) of molecular-beam epitaxy grown BexZn1-xTe thin films. Initially, prism-coupling measurements were used to obtain discrete n values and film thicknesses at specific wavelengths. Reflectivity data was then analyzed using the prism-coupling results to determine n dispersion below the bandgap. Ellipsometry was finally used to model n dispersion both below and above the bandgap, guided by the prior thickness and below-bandgap n data from the other techniques. The combination of these three methods allowed for accurate determination of n over a wide wavelength
Lister_report
This document describes the ATTA (Atom Trap Trace Analysis) experiment which aims to precisely measure trace amounts of krypton isotopes in liquid xenon. ATTA uses laser cooling and trapping techniques to isolate and count individual atoms. The document outlines the ATTA system, which involves exciting atoms to a metastable state using a plasma source, slowing and collimating atoms using optical molasses and Zeeman slowing, and finally trapping atoms using magneto-optical traps. Precisely measuring krypton contamination levels in xenon is important for the larger XENON dark matter detection experiment to understand background signals and increase sensitivity to detect weakly interacting massive particles (WIMPs).
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