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 11 of 11 for “"two-dimensional electron system"”.
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Time, momentum, spin, and energy resolved tunneling spectrum of a two-dimensional electron system
Two-dimensional (2D) electronic systems host a plethora of remarkable phenomena, including the integer and fractional quantum Hall effects (Nobel Prize 1985 and 1998), and have stimulated a wide range of fundamental science and engineering research. Yet, many of the important phenomena that emerge …
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5/2 state in high election density gallium arsenide/aluminum gallium arsenide quantum well
This Master of Science Thesis is concerned with electronic transport in the higher Landau levels (LL) in a two-dimensional electron system, where novel many-body electronic phases have been observed. Particular attention is paid to the even-denominator fractional quantum Hall states at LL filling …
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The effect of a top gate voltage on the Quantum Hall measurement of a 2DEG InGaAs/InAlAs hetero-structure
… of the longitudinal "Rxx " resistance in a two dimensional electron system at different gate voltages. The sample measured utilised the InGaAs/InAlAs heterostructure grown via Molecular Beam Epitaxy (MBE). The above-mentioned effects are investigated before and after exposure of the sample …
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Subsurface Charge Accumulation imaging of the quantum Hall liquid
… Imaging, that enables the direct imaging of electronic systems buried inside semiconductor materials. Using SCA Imaging, we image and measure properties of a two-dimensional electron system (2DES) in a GaAs/AlGaAs heterostructure, in the regime of the integer quantum Hall effect. We observe …
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Relativistic dynamics and Dirac particles in graphene
Graphene, a two-dimensional hexagonal lattice of carbon, has jumped to the forefront of condensed matter research in the past few years as a high quality two-dimensional electron system with intriguing scientific and practical applications. Both the monolayer and bilayer allotropes are of …
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Nonlocal ballistic and hydrodynamic transport in two-dimensional electron systems
… the phonons or defects. In ultraclean material systems such as GaAs/AlGaAs or graphene/hBN heterostructures, momentum-relaxing can be suppressed, leading to the onset of non-diffusive transport regimes, where Ohm's law is no longer valid. Within these non-diffusive regimes, the hydrodynamic …
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Tunneling spectroscopy of the two-dimensional electron gas
… 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 …
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Hydrodynamic and ballistic transport in high-mobility GaAs/AlGaAs heterostructures
The understanding and study of electron transport in semiconductor systems has been the instigation behind the growth of semiconductor electronics industry which has enabled technological developments that are part of our everyday lives. However, most materials exhibit diffusive electron transport …
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Experimental Measurements by Antilocalization of the Interactions between Two-Dimensional Electron Systems and Magnetic Surface Species
… magnetotransport measurements are sensitive to electron interference, and thus can be used as a probe of quantum states. The spin-dependent interactions between controllable surface magnetism and itinerant electrons in a non-magnetic host provide insight for spin-based technologies, magnetic …
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Model calculations of current and density distributions in dissipative Hall bars
… the low-temperature screening properties of a two-dimensional electron gas (2DEG) subjected to strong perpendicular magnetic fields. In chapter 3, numerical results for the unconfined 2DEG are compared with those for a simplified Hall-bar geometry realized by two different confinement models. …