Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"Fermi velocity"”.
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Electronic transport in low-angle twisted bilayer graphene
… states in the two layers can result in reduced Fermi velocity, van Hove singularities and a gapped band structure. In this work, a novel tear-and-stack technique is developed to reliably produce twisted bilayer graphene with controlled angle, and electronic transport measurements of the …
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Power-law liquid in high-temperature superconductors
… decreases from $\alpha\sim1$ in the overdoped Fermi-liquid state to $\alpha\lesssim\frac{1}{2}$ in the optimal and underdoped regime. We find that broad scale invariance of a power-law liquid leads to the cuprates' superconducting dome, vanishing Fermi velocity, and diverging effective mass. We …
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Semi-Empirical Studies on Electronic Properties and Applications of Carbon Nanotubes
… geometry, field strength and position of the Fermi level. We find significant modification of the band structure at the strong field limit. Band gap opening/closing is predicted for metallic/semiconducting zigzag nanotubes, while armchair nanotubes remain metallic due to the high lattice …
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Little Big Bangs in Helium-Three
… we have studied the properties of degenerate Fermi systems under certain extreme non-equilibrium conditions. First, we consider the dynamical evolution of localized hot spots in ultralow temperature Fermi liquids. Within a model calculation, it is found that such perturbations do not relax …
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Correlated dynamics of quantum wires and cigar shaped atomic gases
In one- dimensional Fermi systems the elementary excitations,as predicted by Tomonaga- Luttinger liquid (TLL) theory, are spin and charge density waves, traveling at different velocities (the spin velocity is smaller, the charge velocity greater than the Fermi velocity). These velocities are …
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On-Chip Multiplexers for Transferable Nanomaterials: Design, Fabrication and Applications
… The level spacing is used to calculate the Fermi velocity of carriers and the cyclotron mass of carriers in each Landau level, which provides conclusive evidence that the intrinsic properties of graphene are not significantly altered by the multiplexing technique. From the magneto-transport …
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The study of weak ferromagnetism by andreev reflection spin spectroscopy and development of bimorph electro-thermal actuators
… (P) which was found to be due to disparity in Fermi velocity in electron split bands. Their P is proportional to saturation magnetization, and this material is a potential candidate for spin injection to semiconductors. Room temperature ferromagnetism and finite low temperature spin …
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Understanding the origins of metastability in thin film growth; tantalum and the early group VB-VIB metals
… sufficient to cause the formation of ss-Ta. Fermi surface calculations of the mean electron velocity in the proposed P42/mnm structure of ss-Ta suggest that the high values of resistivity frequently measured for ss-Ta are not an intrinsic property.
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Electronic, Optical, and Thermal Properties of Reduced-Dimensional Semiconductors
… and show a significant renormalization of their Fermi velocity by including many-electron effects. However, the other two recently proposed silicene structures exhibit a finite band gap, indicating that they are gapped semiconductors instead of expected Dirac-fermion semimetals. This finite band …
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Topological insulators and semimetals in the presence of interactions
… superconductor is predicted to host Majorana fermions. To experimentally detect the Majorana fermions, the 3D TI should be thinner than the decay length of the proximity effect to have the fully superconducting TI surface. We study the superconducting proximity effect on the thin film TI, …