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 20 of 27 for “"Coulomb blockade"”.
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Size Dependence of the Electrical Characteristics of Silicon Nanoparticles
… of the holes was determined. In addition, the Coulomb blockade e ect was observed in the tunneling experiments. This e ect was used to determine the dielectric constant of the particles. Both the hole mass and the dielectric constant are of importance to many fields, such as electronics, …
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Single Electron Tunneling at Large Conductance
… quasiparticles where the charge is screened and Coulomb energy is included implicitly in the dispersion relation. During the tunnel process, however, the Coulomb energy is treated exactly leading to Coulomb blockade phenomena. In order to describe these phenomena I use mainly three approaches …
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Quantum Dots In Two-Dimensional Tungsten Diselenide
… accumulate a hole gas. Temperature dependence of Coulomb-blockade peak height is consistent with single-level transport. Excited-state transport in the quantum dot is shown for both monolayer and bilayer devices. Magnetic field dependence of the excited states in the bilayer devices provides a …
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Silicon Nanoelectronic Devices Fabricated by Ultra-High Vacuum, Scanning Tunneling Microscope Nanolithography
… theory. Nonlinear conduction resembling coulomb blockade is observed in a 12 nm wide nanowire and may be due to the formation on unintentional tunnel barriers at the nanowire contacts. The fabrication process outlined within may be extended toward the fabrication of single electron …
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Superconductor -Insulator Transition in Quasi-One-Dimensional Nanowires
… SIT follow the predictions of the theory of weak Coulomb blockade in a diffusive normal metal. Longer wires display signs of a ""mixed"" behavior that is similar to that found for inhomogeneous wires in which a single wire acts as a combination of two or more superconducting and/or insulating …
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Superconductor-insulator transition in quasi-one-dimensional nanowires
… SIT follow the predictions of the theory of weak Coulomb blockade in a diffusive normal metal. Longer wires display signs of a “mixed” behavior that is similar to that found for inhomogeneous wires in which a single wire acts as a combination of two or more superconducting and/or insulating …
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Spin effects in single-electron transistors
… transistors (SETs) are introduced, such as Coulomb-blockade diamonds, inelastic cotunneling thresholds, the spin-1/2 Kondo effect, and Fano interference. With a magnetic field parallel to the motion of the electrons, single-particle energy levels undergo Zeeman splitting according to their …
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A measurement system for and the measurement system of single particle energies in quantum dots
… in a 500nm quantum dot device independent of the Coulomb blockade energy and within an electron mean free path. Devices were defined on a GaAs/AlGaAs heterostructure, the interface of which formed a 2 dimensional electron gas (2DEG). The surface was patterned with metallic surface gates. On the …
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Theoretical Modeling Of Electron Transport In Molecular Devices
… at a mean-field level. We also studied the Coulomb blockade problem that has been experimentally realized in molecular systems such as cobalt bis(terpyridyl) complex where the effects of gating and bias voltage play an important role. The correct description of electron self-interaction …
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Theoretical study of Kondo effect and related transport properties in topological insulator systems
… topological insulator quantum dot (TIQD) in the Coulomb blockade and Kondo regime. An Anderson impurity model is applied to a TIQD system coupled to two external leads, and we show that the model realizes the spin-orbital Kondo effect at the Dirac point where the edge states are not split by a …
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Superconducting tunneling spectroscopy of graphene and graphene nanostructures
… the evolution of the system from a regime of Coulomb blockade to resonant transmission. Our observation could open up new possible applications using nanostructure in these low dimensional materials.
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Engineering the optical quality of quantum emitters in WSe₂
… for application of electric fields and for a Coulomb blockade effect where we were able to deterministically tunnel a desired charge into the emitter. Further, I present the results of photoluminescence excitation measurements. Using this, I identify a quasi-resonant excitation regime giving …
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Nanoelectronic and nanomechanical devices for low temperature applications
… development and methods for a specially modified Coulomb blockade thermometer to achieve electron thermometry below 4mK overcoming the challenge of electron thermalisation for on-chip devices. Mechanically vibrating devices can directly probe bulk and surface fluid properties. We developed …
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Electrical characterization of large-area donor-acceptor molecular junctions
… tunneling and all other mechanisms, resembling a coulomb blockade. The metal complex measured for electrical properties was only stable up to 1.0 V, but all of the molecular junctions have similar current-voltage behavior rectifying at positive bias.
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Resonance fluorescence of novel quantum emitters
… exciton emission properties. A perturbative Coulomb blockade model is applied to telecom wavelength QDs to extract confinement and interaction energies, demonstrating that carriers are in the strong confinement regime. To examine the effect of strong confinement on carrier properties, …
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Imaging Single-Electron Charging in Nanostructures by Low-Temperature Scanning Force Microscopy
In this thesis we investigate Coulomb blockade phenomena and single-electron charging effects in two nanoscale structures: Long semiconducting carbon nanotubes (CNTs) and gold nanoparticles that are linked to a CNT by an organic molecule. While gold nanoparticles naturally exhibit single-electron …
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Transport properties of quantum dot molecules and electronic structure of graphene quantum dot qubits
… of QDMs connected to metallic electrodes in the Coulomb blockade regime. An exterior algebra method is developed to construct the equation of motion computationally, taking into account all correlation functions. The quantum interference (QI) effect of triangular quantum dot molecule (TQDM) …
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Charging of small two-dimensional electron puddles
… a conventional pattern of nearly periodic Coulomb blockade However, the addition spectra of electron droplets larger than 0.2 [mu]m diameter and below a critical electron density (no = 1 x 1011cm-2 in all of our dots) are highly nonperiodic and contain pairs and bunches two or more …
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Radio-Frequency Capacitive Gate-based Sensing for Silicon CMOS Quantum Electronics
… system is detected dispersively using Pauli spin blockade between joint singlet S(2,0) and triplet T$_-$(1,1) states in a finite magnetic field $B$. The singlet-triplet relaxation time $T_1$ at $B=4.5$~T is measured to be $\sim$1 ms using standard homodyne detection technique. Third, I expand the …
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Determining Energy Relaxation Length Scales in Two-Dimensional Electron Gases
… thermopower of quantum point contacts and the Coulomb blockade of quantum dots. However, these techniques have issues with the ease and reliability of fabrication of the thermocouples, and the complexity of their subsequent oper- ation. This thesis presents a direct electron thermometry …
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