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Showing 1 to 20 of 125 for “"energy gap"”.
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Effects of anisotropy of the superconducting energy gap
… effects of anisotropy of the superconducting energy gap are theoretically considered. In order to estimate the effects of anisotropy upon the thermodynamic properties of pure, single-crystal superconductors, a factorable BCSlike model for the effective electron-electron matrix element Vp p • = …
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Modulation of superconducting strip lines by energy gap suppression
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1983.
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Error-suppression by energy-gap protection for quantum computation in open systems
… from noise and decoherence through the use of an energy penalty, recently proposed as a method to suppress error in adiabatic algorithms, is also appealing due to its passiveness. In this thesis, we first introduce the background on quantum computation, and discuss existing efforts towards …
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Using Phonon Imaging to Probe Anisotropy in the Superconducting energy Gap of Lead
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-11-14T18:20:59Z No. of bitstreams: 1 Short_Jonathan.pdf: 7409344 bytes, checksum: 92684f5b5180376dd3bbfabec50d734b (MD5)
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h/e magnetic flux modulation of the energy gap in nanotube quantum dots
We have studied the energy spectrum of multiwall carbon nanotubes using differential conductance measurements. The carbon nanotubes act as the Coulomb island of a single electron tunneling transistor. Temperature dependence of the conductivity curves shows that the electron wave functions extend …
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Atomic-Scale Characterization of Nanometer-Sized Graphene
… spectroscopy, we measure a size-dependent energy gap for graphene quantum dots (QDs) (aspect ratio ≈1) and determine the energy gap (Eg)---size ( L) relation. Our Eg (eV) = 1.53 +/- 0.41 eV·nm/L1.01 +/- 0.23 least-squares fit quantitatively agrees with the simple model Eg (eV) = …
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Probing the Superconducting Gap of Lead With Ballistic Phonons
… consistent values of both the superconducting energy gap parameter and the superconducting phonon absorption coefficient for all phonon-imaging data. Measured values of the energy gap (Delta = 1.32+/-0.07 meV)are consistent with accepted values from tunneling measurements. Phonon imaging …
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INVESTIGATION OF ELECTRIC AND THERMOELECTRIC PROPERTIES OF GRAPHENE NANORIBBON
… Effect Transistors (GFETs) show an estimated energy gap of 13mev for 60nm wide GNR. In addition, we also investigated the thermoelectric properties of GNR. GNR on Si/SiO2 substrate. Seebeck coefficient S of GNR with width of ~70nm and length of 1µm was measured as a function of the back gate …
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A study of superconducting lead-indium alloys subjected to hydrostatic pressure using the electron tunneling technique
… phonon frequencies and of the super-conducting energy gap were also determined.</p> <p>Electron tunneling measurements on Al-Al<sub>2</sub>0<sub>3</sub>—PbIn junctions were made at normal pressures and at various pressures ranging up to approximately 36OO bar. The tunneling measurements rely on …
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Optical Characterization of Defects and Impurities in Gallium Nitride
Photoluminescence was used to measure the bandgap of GaN as a function of temperature in the range 2--811 K, and the results were fitted to Varshni's empirical formula to obtain an expression for the dependence of the energy gap of GaN on temperature which should be generally applicable to most …
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The Characterization of Liquid Phase Epitaxial Indium-Gallium - Arsenide - Phosphide and Indium-Gallium - Arsenide
… was determined by X-ray diffraction, and the energy gap was obtained by optical spectrophotometer transmission measurements. The distribution coefficients for the growth of lattice matched InGaAsP in the 1.15 to 1.31 (mu)m spectral region were determined. The surface morphology of the …
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Optical properties of reduced graphene oxide : insights from ab initio and hybrid density functional theory
… of graphene affords one route toward opening an energy gap, potentially extending its utility to these areas. Graphene oxide strongly absorbs in the ultraviolet range and reduction by various chemical treatments has been demonstrated to shift the absorption peak toward the visible spectrum. …
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Magnetic and Dielectric Properties of Cu3-xNixWO6 and Cu3W1-xMoxO6
… concentration. A spin-singlet ground state with energy gap at low temperatures was observed for all compounds. The energy gap 𝚫 is decreasing with the increasing concentration of Ni. The dielectric permittivity as a function of temperature and different frequency from1 kHz to 20 kHz for all …
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Optoelectronic processes in polyfluorene ambipolar transistors
… polymers have an electronic structure with an energy gap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO). In the neutral ground state, there are no optical transitions at photon energies lower than this gap. When an excess charge is added …
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Exciton coupling and energy transfer in perylene-based systems
… knowledge and mechanistic understanding of energy transfer in perylene-based systems. The investigations were performed using isomeric Donor-bridge-Acceptor systems, where perylene was used as an acceptor. Identifying the correlations between the molecular structure of the dyads and their …
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What goes down need not go back up: decreasing the biological drive toward weight regain by increasing energy flux
… can prevent long-term success. Possibly this energy gap could be attenuated by a high flux (HF) state (higher expenditure coupled with higher intake). METHODS: 6 obese adults [age (mean±SE) = 42±12 y; body mass index (BMI)=35.7±3.7 kg/m2] underwent 7% diet-induced weight loss and were …
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Heuristic modelling of multijunction solar cells using a parallel genetic algorithm
… material parameters calculated as a function of energy gap. This way we have very realistic material parameter set which, together with detailed losses modeling, provide reliable results. To test the model, findings were compared with the record setting devices. Results were in agreement, which …
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Electron tunneling into superconducting mercury films below one degree Kelvin
… The effective phonon spectrum and the complex energy gap function for mercury are thereby derived. Values for the electron self energy function, the electron renormalization function, Coulomb pseudopotentia1, and the electron-phonon interaction constant are also determined.
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Higher-order crystalline topology in resonator circuits
… symmetries are enforced in materials having an energy gap, certain properties of the material can become quantized to specific values that remain constant even if the material is deformed. These fixed properties, known as topological invariants, are robust to any deformation of the material as …
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Electron Tunneling Study of Superconductors Doped With Magnetic Atoms and Nonmagnetic Resonant State Atoms: Indium-Chromium, Zinc-Manganese, and Aluminum-Manganese
… band of states predicted to form in the energy gap of such alloys, though the observed band was broader than that predicted. The annealed samples of Zn-Mn showed a narrower band than did the quench-condensed samples. Reasonable agreement with Shiba's theory was found if s, p, and d wave …
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