Dissertations / Theses on the topic 'Electron gas'
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Prance, Jonathan Robert. "Cooling an electron gas using quantum dot based electronic refrigeration." Thesis, University of Cambridge, 2009. https://www.repository.cam.ac.uk/handle/1810/244593.
Full textHewett, Nicholas Peter. "The electron-phonon interaction in a two dimensional electron gas." Thesis, University of Nottingham, 1988. http://eprints.nottingham.ac.uk/14218/.
Full textKettenis, Mark Martinus. "On the inhomogeneous magnetised electron gas." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2001. http://dare.uva.nl/document/60339.
Full textPapathomas, Paul Michael. "Developments in gas-phase electron diffraction." Thesis, University of Edinburgh, 1998. http://hdl.handle.net/1842/12760.
Full textFender, Robert Scott. "Advances in gas-phase electron diffraction." Thesis, University of Edinburgh, 1996. http://hdl.handle.net/1842/14833.
Full textTovstyuk, C. C. "Thermodynamic Functions of Electron Gas in Strong anisotropic Materials. Quantum Gas." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42583.
Full textDrut, Joaquín E. "The unitary Fermi gas /." Thesis, Connect to this title online; UW restricted, 2008. http://hdl.handle.net/1773/9745.
Full textLeung, Ki Y. "Electron mobilities in binary rare gas mixtures." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29339.
Full textScience, Faculty of
Chemistry, Department of
Graduate
Hayes, Stuart A. "Development of experimental gas electron diffraction technique." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/2581.
Full textVogt, Martin. "Spectral moments in the homogeneous electron gas." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615783.
Full textChabasseur-Molyneux, Vincent Robert. "Ohmic contacts to the two dimensional electron gas of GaAs-A1GaAs heterostructures." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624719.
Full textSpink, Graham George. "Application of quantum Monte Carlo methods to homogeneous electron and electron-hole systems." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/275725.
Full textTas, Murat. "Dielectric Formulation Of The One Dimensional Electron Gas." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12604981/index.pdf.
Full textLeonard, Darren J. T. "Dynamical properties of the two-dimensional electron gas." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301235.
Full textNoble-Eddy, Robert. "Gas-phase electron diffraction studies of unstable molecules." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/4101.
Full textMcCaffrey, Philip D. "Equilibrium structures from gas-phase electron-diffraction data." Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/2601.
Full textOuali, Fatma Fouzia. "Phonon emission from a two dimensional electron gas." Thesis, University of Nottingham, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293620.
Full textAl-Dubuni, M. H. "Electrical properties of the two dimensional electron gas." Thesis, University of St Andrews, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384581.
Full textEnsslin, Kasey Josephine 1982. "Gas electron multipliers in a time projection chamber." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/16901.
Full textIncludes bibliographical references (p. 71-73).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
by Kasey Josephine Ensslin.
S.B.
Chan, Ho Bun 1969. "Tunneling spectroscopy of the two-dimensional electron gas." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9387.
Full textIncludes bibliographical references (p. 155-161).
We measure the single particle density of states (DOS) of a two-dimensional electron system (2DES) in a GaAs/AlGaAs heterostructure. Using a technique that we call "Time Domain Capacitance Spectroscopy" (TDCS), we measure the complete current-voltage characteristics for tunneling into the 2DES without making ohmic contacts to it. TDCS detects the tunneling current in regimes difficult to access by conventional methods, such as when the in-plane conductance is low. For the first time we detect the contributions of localized states to the tunneling current. The DOS of an interacting 2DES in the diffusive limit displays logarithmic energy dependence near the Fermi level. Using TDCS, we measure the voltage dependence of the tunneling conductance of a semiconductor 2DES and observe the logarithmic Coulomb anomaly for the first time in 2D systems other than thin metal films. As we increase the density, this suppression in tunneling conductance narrows and recedes. Nevertheless suppression reappears when we apply a magnetic field perpendicular to the 2D plane. We find that the tunneling conductance depends linearly on voltage near zero bias for all magnetic field strengths and electron densities. Moreover, the slopes of this linear gap are strongly field dependent. The data are suggestive of a new model of the tunneling gap in the presence of disorder and screening. We also use TDCS to study the interactions among electronic spins. By applying excitations less than kT, we observe that equilibrium tunneling into spin-polarized quantum Hall states (v=l, 3, 1/3) occurs at two distinct tunneling rates for samples of very high mobility. Some electrons tunnel into the 2DES at a fast rate while the rest tunnel at a rate up to 2 orders of magnitude slower. Such novel double-rate tunneling is not observed at even-integer filling fractions where the 2DES is not spin-polarized. The dependence of the two rates on magnetic field, temperature and tunnel barrier thickness suggests that slow in-plane spin relaxation, possibly related to formation of Skyrmions, leads to a bottleneck for tunneling of electrons.
by Ho Bun Chan.
Ph.D.
Wan, Zhong. "Induced Superconductivity in Two Dimensional Electron Gas System." Thesis, Purdue University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10830652.
Full textRecently, interest in superconductor-semiconductor interfaces was renewed by the search for non-Abelian states. One of the possible platform is proximity induce superconductivity into an 1D semiconductor system with strong spin orbit (SO) interaction, such system is predicted to support Majorana excitation. Another candidate is superconductivity coupled to the edge of fractional quantum Hall state, in such system, higher order of non-Abelian statistics is predicted. With such non-Abelian states, topological quantum computing can be realized. In this thesis, I will discuss the approach made by us to investigate such system.
Young, Stuart. "Towards gas-phase electron diffraction of novel species." Thesis, University of York, 2015. http://etheses.whiterose.ac.uk/11357/.
Full textOwen, J. A. "Effects of the relativistic correction to the electron mass on electron cyclotron current drive." Thesis, University of St Andrews, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370602.
Full textEbrahimnejad, Rahbari Seyed Hadi. "Electrical measurement of spin-dependent resistivity in GaAs/AlGaAs two-dimensional electron gas." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/13900.
Full textMatthews, Paul. "The fabrication and measurement of a two-dimensional electron gas base hot electron transistor." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284193.
Full textNunner, Tamara S., N. A. Sinitsyn, Mario F. Borunda, V. K. Dugaev, A. A. Kovalev, Ar Abanov, Carsten Timm, et al. "Anomalous Hall effect in a two-dimensional electron gas." American Physical Society, 2007. http://hdl.handle.net/2237/11243.
Full textBarker, D. R. "Frozen electron gas models for molecular dynamics of liquids." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596361.
Full textCarter, Paul James Anthony. "Acoustic phonon scattering by a 2 dimensional electron gas." Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329844.
Full textCooper, John. "Phonon emission from a hot two-dimensional electron gas." Thesis, University of Nottingham, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334781.
Full textHolwill, C. J. "Determination of molecular structure by gas-phase electron diffraction." Thesis, University of Reading, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380843.
Full textWilkinson, Robert. "Plasmons in a grating-coupled two-dimensional electron gas." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386821.
Full textDial, Oliver Eugene III. "Single particle spectrum of the two dimensional electron gas." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/45158.
Full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 251-265).
Accurate spectroscopy has driven advances in chemistry, materials science, and physics. However, despite their importance in the study of highly correlated systems, two-dimensional systems (2DES) have proven difficult to probe spectroscopically. Typical energy scales are on the order of a millielectron volt (meV), requiring high resolution, while correlated states of interest, such as those found in the integer and fractional quantum Hall effect, are destroyed by excessive electron heating. Approaches based on tunneling have been hampered by problems such as ohmic heating and low in-plane conductivity, while optical approaches probe long-wavelength excitations which can be difficult to interpret. Here we present a refined spectroscopic technique, time domain capacitance spectroscopy (TDCS), with which we measure the single particle density of states (DOS) of a 2DES with temperature-limited resolution. In TDCS, sharp voltage pulses disequilibrate a metallic contact from a nearby 2DES, inducing a tunnel current. We detect this current by monitoring the image charge of the tunneled electrons on a distant electrode. No ohmic contact to the 2DES is required. The technique works when the 2DES is empty or has vanishing in-plane conductivity, as frequently occurs in studying the quantum Hall effect. Using TDCS, we perform unprecedentedly high resolution measurements of the DOS of a cold 2DES in GaAs over a range from 15 meV above to 15 meV below the Fermi surface. We provide the first direct measurements of the width of the single-particle exchange gap and single particle lifetimes in the quantum Hall system. At higher energies, we observe the splitting of highly excited Landau levels by spin polarization at the Fermi surface, demonstrating that the high energy spectrum reflects the low temperature ground state in these highly correlated systems. These measurements bring to light the difficult to reach and beautiful structure present far from the Fermi surface.
by Oliver Eugene Dial, III.
Ph.D.
Shepherd, James John. "A quantum chemical perspective on the homogeneous electron gas." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608223.
Full textElahi, A. "Plasma electrochemistry : electron transfer at the solid/gas interface." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1427871/.
Full textSano, Noriaki. "Development of Gas Purification Technology by Selective Electron Attachment." Kyoto University, 1997. http://hdl.handle.net/2433/202297.
Full textLiu, Yangmingyue. "Scanning Electron Microscopy To Probe Working Nanowire Gas Sensors." OpenSIUC, 2013. https://opensiuc.lib.siu.edu/theses/1256.
Full textBowman, John V. "Transport in a confined two-dimensional electron gas with longitudinal potential variations." Virtual Press, 1995. http://liblink.bsu.edu/uhtbin/catkey/958798.
Full textDepartment of Physics and Astronomy
Hughes, Ian G. "Electron ion and ion-ion collisions." Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335410.
Full textBarroy, Pierre ReneÌ Jean. "Electron kinetics in non-equilibrium plasmas." Thesis, Open University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272394.
Full textGrumbling, Emily Rose. "Electronic Structure, Intermolecular Interactions and Electron Emission Dynamics via Anion Photoelectron Imaging." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/195933.
Full textFröhlich, Bernd. "A strongly interacting two-dimensional Fermi gas." Thesis, University of Cambridge, 2011. https://www.repository.cam.ac.uk/handle/1810/252252.
Full textRiley, Susan Tania. "Combined two-dimensional electron gas and artificial spin ice structures." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/13973/.
Full textTamm, Brian Paul. "Gas electron multipliers and a scanner for automated quality control." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32905.
Full textIncludes bibliographical references (p. 85-87).
The gas electron multiplier (GEM) is a novel charge amplification element for use in gaseous particle detectors. Because of their high gain ([approx.] 10⁵ when cascaded) and ability to withstand harsh radiation conditions, GEMs have been selected for use in the time projection chambers of the latest high-energy experiments, including COMPASS, STAR, and the planned ILC. Foil quality has been found to be critical for optimal GEM performance. If an irregularity in just one of the roughly 600, 000 amplification holes of a 10 x 10 cm GEM induces a spark discharge, the entire GEM is useless. Computer simulations have also shown that amplification behavior is strongly dependent on hole diameter and shape. To improve foil quality control, an automated scanner has been constructed to optically examine every hole in a GEM. The machine can measure each hole's outer copper diameter and inner Kapton diameter and locate and geometrically classify any foil imperfections. The scanner has been used to characterize GEMs recently manufactured by Tech-Etch. These scans indicate a general absence of etching defects, but measured diameter inhomogeneity may result in gain variations as large as i20% over the active foil area.
by Brian Paul Tamm.
S.B.
Harland, Peter W. "Studies of gas phase electron, ion and atom collision processes." Thesis, University of Edinburgh, 1995. http://hdl.handle.net/1842/14990.
Full textSchirlin, Julien T. "Targeting low vapour pressure compounds in gas-phase electron diffraction." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/11377.
Full textTruitt, Patrick A. "Measurement of coupling between the electron gas and nanomechanical modes." College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7738.
Full textThesis research directed by: Dept. of Physics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
SanGiorgio, Paul. "Measuring Electron Gas Relaxation in Gold through Second Harmonic Generation." Scholarship @ Claremont, 2001. https://scholarship.claremont.edu/hmc_theses/136.
Full textÖstling, Janina. "New Efficient Detector for Radiation Therapy Imaging using Gas Electron Multipliers." Doctoral thesis, Stockholm University, Medical Radiation Physics (together with KI), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-857.
Full textCurrently film is being replaced by electronic detectors for portal imaging in radiation therapy. This development offers obvious advantages such as on-line quality assurance and digital images that can easily be accessed, processed and communicated. In spite of the improvements, the image quality has not been significantly enhanced, partly since the quantum efficiency compared to film is essentially the same, and the new electronic devices also suffer from sensitivity to the harsh radiation environment. In this thesis we propose a third generation electronic portal imaging device with increased quantum efficiency and potentially higher image quality.
Due to the parallel readout capability it is much faster than current devices, providing at least 200 frames per second (fps), and would even allow for a quality assurance and adaptive actions after each accelerator pulse. The new detector is also sensitive over a broader range of energies (10 keV - 50 MeV) and can be used to obtain diagnostic images immediately prior to the treatment without repositioning the patient. The imaging could be in the form of portal imaging or computed tomography. The new detector is based on a sandwich design containing several layers of Gas Electron Multipliers (GEMs) in combination with, or integrated with, perforated converter plates. The charge created by the ionizing radiation is drifted to the bottom of the assembly where a tailored readout system collects and digitizes the charge. The new readout system is further designed in such a way that no sensitive electronics is placed in the radiation beam and the detector is expected to be radiation resistant since it consists mainly of kapton, copper and gas.
A single GEM detector was responding linearly when tested with a 50 MV photon beam at a fluence rate of ~1010 photons mm-2 s-1 during 3-5 μs long pulses, but also with x-ray energies of 10-50 keV at a fluence rate of up to ~108 photons mm-2 s-1. The electron transmission of a 100 μm thick Cu plate with an optical transparency of ~46% was found to be ~15.4%, i.e. the effective hole transmission for the electrons was about one third of the hole area. A low effective GEM gain is enough to compensate for the losses in converters of this dimension. A prototype for the dedicated electronic readout system was designed with 50 x 100 pixels at a pitch of 1.27 mm x 1.27 mm. X-ray images were achieved with a single GEM layer and also in a double GEM setup with a converter plate interleaved. To verify the readout speed a Newton pendulum was imaged at a frame rate of 70 fps and alpha particles were imaged in 188 fps. The experimental studies indicates that the existing prototype can be developed as a competitive alternative for imaging in radiation therapy.
Mollart, T. P. "Electron emission processes in cold cathode thermal arcs." Thesis, Durham University, 1993. http://etheses.dur.ac.uk/5546/.
Full textMcKitterick, David. "Phonon probing of magnetically quantised 2D electron systems." Thesis, University of Nottingham, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359910.
Full text