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Showing 1 to 13 of 13 for “"Hall bar"”.
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HYDRODYNAMIC AND BALLISTIC TRANSPORT IN ULTRA-CLEAN 2D ELECTRON SYSTEMS
… equations. We do this for the Corbino and Hall bar geometries, and also for two-carrier transport due to electrons and holes. In the latter part, we shift our focus to systems where e-e scattering length is not the smallest length scale. For this, we study transport in the more general …
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Mesoscopic quantum interference experiments in InGaAs and GaAs two-dimensional systems
… ring interferometer array in 2D electron system, Hall bar geometries and narrow wires in 2D hole systems. The single ring interferometer yields pronounced Aharonov-Bohm (AB) oscillations with magnetic flux periodicity of h/e over a wide range of magnetic field. The periodicity was confirmed by …
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Model calculations of current and density distributions in dissipative Hall bars
… 2DEG are compared with those for a simplified Hall-bar geometry realized by two different confinement models. It is shown that in the strongly nonlinear-screening limit of zero temperature the total variation of the screened potential is related by simple analytical expressions to the amplitude …
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Skyrmions and non-collinear magnetic domains in Fe₃GeTe₂
… fabrication procedures to produce Fe3GeTe2 Hall bar devices and (3)characterized the eld and temperature-dependent magnetic properties of Fe3GeTe2 using magnetometry, magnetic force microscopy and electrical transport measurements. We found that the magnetic properties of Fe3GeTe2 are highly …
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Quantum Hall transport in graphene and its bilayer
… results in an unconventional integer quantum Hall effect, with a peculiar Landau Level at zero energy. In bilayer graphene, the Dirac-like quadratic energy spectrum leads to an equally interesting, novel integer quantum Hall effect, with a eight-fold degenerate zero energy Landau level. In …
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Thermal, Electrical, and Spin Transport: Encompassing Low-Damping Ferromagnets and Antiferromagnetic/Ferromagnetic Heterostructures
… advancements bring forth escalating challenges in global energy consumption and subsequent power dissipation, posing significant economic and environmental concerns. In response to these difficulties, the fields of thermoelectrics, spintronics, and spincaloritronics emerge as …
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Electronic device fabrication and characterization based on two-dimensional materials
… structures are identified. The transistors and Hall-bar devices based on vertical monolayer-MoS2/monolayer-WS2 heterostructures are successfully fabricated. The devices show typical n-channel characteristics, indicating that MoS2 and WS2 are naturally n-type doped. Due to the type II band …
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Implementation of the Quantum Hall Effect based precision resistance measurement system
The integer Quantum Hall Effect (QHE) occurs when a two-dimensional electron gas (2DEG) is subjected to a strong perpendicular magnetic field and when the system is cooled to low temperatures. The QHE harbours a wealth of unique phenomena. Of interest is the existence of the Quantum Hall Resistance …
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Spin Properties of Heavy Holes in Low-Dimensional Quantum Electronic Devices
… devices are used to probe spin physics, and 2D Hall bar devices are used to test new wafer designs and fabrications methods for controlling the spin-orbit interaction. In 1D systems, the anomalous shoulder on the first subband, known as the 0:7 anomaly, has remained an open problem in mesoscopic …
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A measurement system for and the measurement system of single particle energies in quantum dots
… to the 2DEG. The devices were fabricated in a Hall bar geometry using standard nanofabrication techniques. Measurements were performed using a 3He/4He Kelvinox 25 dilution refrigerator unit at a lattice temperature of TL45mK. Prior to the work detailed in this thesis the lowest effective …
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The Use of Secondary Ion Mass Spectrometry to Advance Integrated Process Technology for 2D Materials
… located in blisters and we investigate two Hall-bar devices where ToF-SIMS measurements are done in conjunction with transport characterisation to address the question of how much contamination is enough to alter device performance and to determine how contamination-tolerant such devices …
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Investigating electron transport in chemical vapor deposition graphene nanostructures
… as nanoribbon multiple quantum dots, quantum Hall antidots, and double quantum dots (DQDs). The presence of multiple quantum dots in series is exhibited in a bilayer SiC epitaxial graphene nanoribbon, due to the interplay between disorder and quantum confinement. As an alternative to etched …
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Phase coherent transport phenomena in HgTe quantum well structures
… Thus, Shubnikov-de Haas and the quantum Hall effect have been analysed. Due to the first fabrication of nanostructures on Hg-based quantum well samples, the observation of ballistic transport effects could be expected. Hence, the Landauer-B¨uttiker theory has been introduced which gives …