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 21 for “"edge state"”.
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The Edge States of Epitaxial Graphene on SiC
… and Al2O3 as a protective layer to reduce the edge roughness of ribbons and the contamination from resist residue. Then we discuss transport measurement results of graphene nanoribbons on Si-face as well as on non-polar SiC facets, which might reveal a ballistic edge state channel 0+ with mean …
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Exploring the interplay between topological order, magnetism and superconductivity
… exhibited by an interacting quantum spin Hall edge state in the presence of finite chemical potential (applied gate voltage) and spin imbalance (applied magnetic field). We find that the helical nature of the edge state gives rise to orders that are expected to be absent in non-chiral …
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The autoregressive stochastic block model with changes in structure
… of the number of blocks, block memberships and edge-state parameters in the stochastic block model. These allow for non-binary and non-conjugate edge models, something not considered in the literature. Secondly, a dynamic extension to the stochastic block model is presented which includes …
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Quantum Hall transport in graphene and its bilayer
… energy. We also present data on quantum Hall edge transport across the interface of a graphene monolayer and bilayer junction, where peculiar edge state transport is observed. We investigate the quantum Hall effect near the charge neutrality point in bilayer graphene, under high magnetic …
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Twist angle physics in graphene based van der Waals heterostructures
… allowing us to put independent quantum Hall edge modes in both layers. We study the edge state interactions in this system, culminating in the formation of a quantum spin Hall state in twisted bilayer graphene. In the small twist angle limit, interlayer interactions are strong and the layers …
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Subsurface Charge Accumulation imaging of the quantum Hall liquid
… the disorder-induced nonzero density of states in the cyclotron gap. We also measure the charging properties of incompressible strips that form parallel to the edges of a metal gate deposited on the surface of our sample. An RC model considering charging of the 2DES across the strip, …
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Edges from image
To simulate the edge perception ability of human eyes and detect scene edges from an image, context information and world constraints must be employed in the edge detection process. To accomplish this, two Bayesian decision theoretic frameworks for context dependent edge detection are developed …
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Quantum Dynamics of Strongly-Interacting Bosons in Optical Lattices with Disorder
… study the center of mass dynamics of states derived from the disordered Bose-Hubbard model in a trapping potential. We find that the edge states in the trap allow center of mass motion even with insulating states in the center. We identify short and long-time mechanisms for edge state …
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Nanophotonics for tailoring light-matter interaction/
… The second phenomenon is photonic chiral edge state, where the breaking of time-reversal symmetry forces light to travel in only one direction. Based on the directional coupling between one-way waveguide and conventional two-waveguide, we propose a new type of optical circulators, which …
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Wave transport in parity-time symmetric, time-varying, and quasi-periodic systems
… to study fractal energy band and topological edge state. Overall, my explorations have been enabling a new degree of control of waves in circuits and metamaterials, pushing forward the opportunities for extreme wave-matter interactions using gain and time modulations.
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Quantum transport in gapped graphene
… a spin-degenerate ballistic counter-propagating edge state forms and dominates with a possible secondary contribution from a network of one-dimensional conducting channels with soliton-like domain walls. The spin-degenerate ballistic edge states offer possibilities for electronic applications …
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Magnetotransport in superconductor to semiconductor junctions: multiple Andreev reflections and coupling to quantum hall states
… correlations which can lead to a new ground state charge carrier. In this work, coupling between superconductors and 2DEGs was studied. Using band structure engineering as well as InGaAs and InAs caps, junctions were fabricated in which the superconductor was extremely well-coupled to the …
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Scanning tunneling microscopy studies of a tunable topological insulator and magnetic Weyl semimetal
… with material systems, and the unique electronic states necessitated by non-trivial topology, has been a major thrust of condensed matter research for the past two decades. As exotic topological electronic states often manifest themselves at reduced dimensional interfaces, local experimental …
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Charge carrier dynamics in lead sulfide quantum dot solids
… can be explained by a 1-2 Å contraction in the edge-to-edge nearest neighbor quantum dot spacing. In Chapter 4, we study optical states that are 100-200 meV lower in energy than the band gap. Because we work with monodisperse quantum dots, we are able to resolve this trap state separately from …
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Exciton Dynamics in Organic and Inorganic Nanoscale Materials
… to control the recovery from the photobrightened state through rigidification of the aggregate structure. The next section then investigates the dynamics of triexciton recombination pathways in inorganic CdSe/CdS core-shell nanocrystals (NCs). I present the use of time- and spectrally-resolved …
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Spin-orbit or Aharonov-Casher edge states in semiconductor systems
We present studies of edge states induced by the Aharonov-Casher vector potential or Rashba-type spin-orbit interaction using quantum transport in InGaAs/InAlAs herterostructures. The Aharonov-Casher effect is electromagnetically dual to the Aharonov-Bohm effect and is predicted to lead to edge …
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Applications of conformal field theories in topological phases of matter
… correlated electronic integer quantum Hall states with filling factor 16. The edge state is a bosonic chiral (E8)1 CFT, which is closely related to topological paramagnets in (3+1)d. As a distinguishing feature, these states support electric and thermal Hall transport violating the …
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Statistical Stability and Fast Transient Growth in Wall-Bounded Turbulence
… and their interactions rely on the knowledge of the mean velocity profile and include linear models such as modal stability analysis and transient growth calculation. With a purpose to better the understanding of the relationship between the mean flow and the background turbulence …
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Momentum-space lattices for ultracold atoms
… dynamics of free-particle-like atomic momentum states. We expose a Bose–Einstein condensate to two laser fields that are capable of driving transitions between different momentum states of the condensate atoms through a two-photon Bragg diffraction process. Neighboring states in the …
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Topological Insulating States in Photonics and Acoustics
… to the discovery of a variety of new topological states, and their topological invariants are characterized by numerous approaches in the category of topological band theory. The common features shared by topological insulators include, the topological phase transition occurs if the bulk bandgap …
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