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.
Results
Showing 1 to 20 of 41 for “"ballistic transport"”.
-
HYDRODYNAMIC AND BALLISTIC TRANSPORT IN ULTRA-CLEAN 2D ELECTRON SYSTEMS
This work is broadly on hydrodynamic transport in mesoscopic systems, resulting from strong electron-electron interactions. In the first part, we consider electrons are in near thermal equilibrium with each other, and for which case we calculate conductance by solving hydrodynamic equations. We do …
-
A ballistic transport model for HEMTs and III-V MOSFETs
… allow a more thorough exploration into the basic transport physics of a quantum-well III-V device. We know from HEMT experimental data that electrons travel ballistically at gate lengths of 30- 40 nm, suggesting that a ballistic transport model will only become more accurate as channel lengths are …
-
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 …
-
Fabrication of Quantum Effect Devices and Their Characterization in the Ballistic Transport Regime
Transport study in finite lateral superlattices are carried with varying gate numbers of the surface gate fingers. Evidence of potential modulation in the channel induced by the surface gate electrodes is observed. Conductance study suggests formation of a one-dimensional propagating path across …
-
Novel transport regimes in graphene
Transport phenomena in solids -- such as energy and charge flows in response to external fields -- is a subject of fundamental interest for solid state physics. Carrier transport exhibits a wide variety of intriguing and potentially useful behaviors arising due to a rich and complex interplay …
-
Experimental investigation of hot electron and related effects in gallium(aluminum)arsenide devices
… devices such as resonant tunneling and ballistic transport and various hot electron effects discussed within, have been moved from the status of academic curiosity to physically realizable, useful effects.
-
Theoretical Studies of High Field, High Energy Transport in Gallium-Arsenide, Silicon and Heterostructures
The study of high field transport has been instrumental to the theory of many semiconductor devices based on, e.g., the Hilsum-Ridley-Watkins mechanism, impact ionization phenomena, and recently real space transfer. It will become even more important as device sizes approach submicron dimensions. …
-
The self-consistent simulation of carrier transport and its effect on the modulation response in semiconductor quantum well lasers
… recombination processes and the carrier transport mechanisms included in the simulator are first presented. Carrier transport in bulk regions of the device is modeled with drift-diffusion theory, and carrier fluxes at abrupt heterojunctions are treated with ballistic transport derived …
-
Giant Magnetoresistance and Quantum Transport in Magnetic Hybrid Nanostructures.
… a very general numerical technique to compute transport properties of heterogeneous systems, which can be used together with accurate spd tight-binding Hamiltonians or simpler models. I will then apply this technique to several transport problems in the mesoscopic regime. Firstly I will review …
-
Experimental Quantification of the Phonon Drag Deformation Mechanism in Metals at Extreme Strain Rates
… recent advances in optically driven microballistics using laser induced projectile impact tests have provided a new quantitative look into extreme mechanics of materials, at rates above 106 s-1 and well below the onset of shock effects. As deformation strain rates increase, additional …
-
The Edge States of Epitaxial Graphene on SiC
Exceptional ballistic transport was observed in sidewall epitaxial graphene nanoribbons on SiC (SWGNRs) at room temperature. These objects are of fundamental interest as they provide a direct access to charge neutral graphene with excellent transport properties. In this thesis, beyond sidewalls, we …
-
Experimental and numerical investigation of phonon mean free path distribution
… sapphire at room temperature. A multidimensional transport model based on the grey phonon Boltzmann equation is developed and solved to study the quasi-ballistic transport occurring in the spectroscopy experiments. To account for the nonlinear dispersion relation, we present a variance reduced …
-
Engineering superconductivity in ballistic semiconductor nanowires
… interfaces must be developed. Second, a lack of ballistic 1D behavior can induce quantum-localized bound states that mimic Majorana signatures. Therefore, both the proximitized nanowire and neighboring readout nanostructures should support ballistic transport. This thesis focuses on the …
-
Volatile Ice Deposits in Lunar Polar Regions and Their Sources
… using a combination of numerical models of ballistic transport of water vapour. This process included both a validated Monte Carlo model and a full lunar exospheric model, which had not previously been used to explore poleward of 85S or in any part of the northern hemisphere. This work …
-
Multiscale modeling of thin film deposition processes
… process involves complex surface reactions and transport phenomena that ranges over different length scales. In this work, predictive simulation tools for these two processes have been developed by investigating the surface reaction and the transport phenomena in IPVD and ECD processes. In the …
-
Experimental Observation of Geometric Phases in Narrow-Gap Semiconductor Heterostructures
… (0.4 K ≤ T ≤ 8 K), low noise (â V ~ 1μV ) transport measurements, and observed evidence of Aharonov-Bohm (AB) and Alâ tshuler-Aronov-Spivak (AAS) quantum oscillations in meso- scopic devices that we fabricated on these NGSs. Our measurements are unique in that we observe both AB and AAS in …
-
Tunable spin polarization and conductance anomalies in mesoscopic one-dimensional systems
The electronic transport properties of mesoscopic one-dimensional (1D) devices have attracted significant interest because of their potential applications and their unique characteristics, some of which – for instance, the “0.7” conductance anomaly in quantum point contacts – have remained …
-
Collective Phenomena in Excitonic Quantum Matter
… with quantum coherence and possible super-transport persisting up to room temperature. Alternatively, in large-bandgap semiconductors, the Bose-Einstein condensation of optically active metastable excitons opens the door to nonlinear optical processes, coherent light generation, and exciton …
-
Geometrical Optimization of Planar Nano Vacuum Channel Transistors
… with just 10 V. The small gaps give rise to ballistic transport through the channel, which combined with the low capacitances of the electrodes, gives rise to ultrafast response times. Nano vacuum channel devices have also exemplified robustness in the face of extreme radiation and …
-
Imperfection-Aware Design of CNFET Digital VLSI Circuits
… The CNFET, which is a 1-D structure with a near-ballistic transport capability, can potentially offer excellent device characteristics and order-of-magnitude better energy-delay product over standard CMOS devices. Significant challenges in CNT synthesis prevent CNFETs today from achieving such …
Page 1 of 3