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 24 for “"low-dimensional systems"”.
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Luttinger Liquid Behavior in Low-Dimensional Systems
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Rachelle Ramer (rramer2@illinois.edu) on 2012-05-17T17:43:36Z Item is restricted indefinitely.
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Electronic structure and transport in low dimensional systems
… of the I-V-characteristics. For all systems the electronic structure was investigated by means of density functional theory. Additional the charge transport in between gold leads was computed based on non equilibrium Greens functions. For the system of coupled quantum dots it is shown …
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Anderson Localization in Low-Dimensional Systems with Long-Range Correlated Disorder
… phenomenological representation of many physical systems. To date, a large amount of effort has been dedicated to the study of uncorrelated, or short-range correlated, disorder distributions. However, more recent efforts on long-range correlated disorder distributions have yielded richer results, …
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Structural aspects of pressure- and temperature-induced phase transitions in low-dimensional systems
This thesis reports on structural studies of low-dimensional systems MOCl (M = Sc, Ti, V, Cr, Fe) and TiPO4 subjected to non-ambient conditions. Transition metal oxychlorides MOCl have been investigated at high pressures in diamond anvil cells by means of single-crystal synchrotron X-ray …
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Collective excitations in low dimensional systems and stochastic control of population growth in a fluctuating environment
… this thesis, I study several problems in the following areas: collective excitations in condensed matter physics, noise in gene network and stochastic control in biophysics. In the first area, I construct an effective field theory to describe Bose-Einstein Condensate (BEC) realized in an external …
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First-principles structure prediction of extreme nanowires
Low-dimensional systems are an important and intensely studied area of condensed matter physics. When a material is forced to adopt a low-dimensional structure, its behaviour is often dramatically different to that of the bulk phase. It is vital to predict the structures of low-dimensional systems …
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"“Phonon"" and electron transport in glass-crystal dual materials"
… disorder affects vibrational energy transport in low-dimensional disordered materials. The recently synthesized amorphous graphene and glassy diamond nanothreads are studied. Modal localization analysis, molecular dynamics simulations, and a generalized analytical model together demonstrate that …
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Optical properties of two-dimensional transition metal dichalcogenides
… of band gaps, has diversified the family of two-dimensional materials and boosted the research on their potential applications in the fields of logic nanoelectronics and high-performance nanophotonics. Many body effects are of great significance in 2-dimensional TMDs, especially when thinned down …
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Semiclassical Approaches to Complex Chemical Simulation in Real Time
… SC theory impractical for all but very simple, low-dimensional systems. In this dissertation we derive a variety of mixed quantum-classical (MQC) representations of the real-time correlation function within the SC initial value representation (SC-IVR) using the modified Filinov filtration (MFF) …
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Investigating chaos by the generalized alignment index town (GALI) method
… the fundamental tasks in the study of dynamical systems is the discrimination between regular and chaotic behavior. Over the years several methods of chaos detection have been developed. Some of them, such as the construction of the system's Poincar´e Surface of Section, are appropriate for …
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Quantum Monte Carlo study of low dimensional materials
… thesis addresses several challenging problems in low-dimensional systems, which have rarely or never been studied using quantum Monte Carlo methods. It begins with an investigation into weak van der Waals-like interactions in bilayer graphene and extends to graphene placed on top of boron nitride …
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Nonreciprocal phenomena in superconductivity
… studies several unusual phenomena that arise in low-dimensional systems in the presence of a magnetic field. The first example that we discuss is nonreciprocal superconductivity, which occurs upon simultaneous breaking of inversion and time-reversal symmetries. Nonreciprocal superconductors …
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Quantitative mapping of nanothermal transport via Scanning Thermal Microscopy
… as optoelectronic thin film. We also measured low dimensional systems of 2D materials heterostructures from franckeite and graphene on MoS2. Thermoelectric properties of graphene nanoconstrictions are unveiled using a combined three-terminal approach. Additionally, cryoSThM is introduced as a …
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Low-dimensional electron systems fabricated with an atomic force microscope
… intensive research into electron transport in low dimensional systems, especially those fabricated in semiconductor material. This research has added to our understanding of electrical transport properties outside of the macroscopic regime, and allowed exploration of potential device designs …
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Numerical solutions of matrix equations arising in model reduction of large-scale linear -time -invariant systems
… model reduction of linear-time-invariant (LTI) systems. Such systems arise in a variety of areas, especially in circuit simulation. When an integrated circuit has millions of devices, performing a full-system simulation can be infeasible due to the time required for the nonlinear solver to …
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Theory and modeling of field electron emission from low-dimensional electron systems
… from semiconductors, highly-curved surfaces, or low-dimensional systems, have been developed, but none have sought to treat these properties coherently within a single framework. As a result, the work in this thesis develops a multidimensional, semiclassical framework for field emission, from …
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Chaos Control of an Open Shear Flow: A Novel Control Strategy and its Experimental Demonstration in an Axisymmetric Jet
A nonlinear dynamical systems approach to control the coherent structure dynamics and turbulence in the near field of an axisymmetric jet is presented. Experiments were performed in an initially laminar circular jet, housed in a low-noise anechoic chamber. Periodic flow states involving various …
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Thermal transport in graphene-based nanostructures and other two-dimensional materials
… However, little is known about heat flow in two-dimensional (2D) materials or devices with dimensions comparable to the phonon mean free path (MFP). Here, we investigated thermal transport in graphene-based nanostructures and several other 2D materials. First, we measured heat …
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Reliability, power dissipation, sensing, and thermal transport in carbon nanomaterials and devices
… of nanomaterials, such as carbon nanotubes and 2-dimensional crystals (e.g. graphene), have presented new opportunities to improve energy use at the macro and nanoscale. However, much work remains to be done to fully understand the high-field reliability and fundamental properties of these …
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Tunneling spectroscopy of carbon nanostructures: a romance in many dimensions
… – electron interaction in carbon nanotubes and low dimensional systems in general. We also apply those methods to two dimensional graphene sheets. We first review the fabrication techniques used to make the devices studied here. Some of the techniques are standard in nanofabrication, and some …
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