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Showing 1 to 20 of 156 for “"Superlattices"”.
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Nonlinear transport in semiconductor superlattices
"We develop a semiclassical balance equation model for transport through a single miniband of a semiconductor superlattice subject to a spatially uniform, time-dependent external electric field and/or a constant external magnetic field. The balance equations are derived from the semiclassical …
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Hydrogen in niobium-tantalum superlattices
Hydrogen has been dissolved in Nb/Ta superlattices for which the structural and thermodynamic properties of this new H-metal system were studied, in situ, by x-ray diffraction. It is found that H induces a strain modulation exhibiting a Curie-Weiss type temperature dependence, thus, providing a …
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The surface response of metallic superlattices
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Phase Stabilised Superlattices for Quantum Simulation
… the kagome lattice, as well as other superlattices, is the stringent control of the optical phase of the lattice laser beams. We discuss the mechanisms which have been developed to achieve the required control and stability; and demonstrate that our machine has sufficient control to …
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Bloch-oscillating Electrons in Moiré Superlattices
The extremely narrow bands in moiré materials harbor surprising transport regimes not accessible in other materials. As discussed in this thesis, a large superlattice periodicity and narrow bandwidth create an appealing setting for realizing and probing electronic Bloch oscillations. A key property …
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Spin-obit coupling in optical superlattices
… system using pseudospin-1/2 in an optical superlattices, as well as progress towards detecting the stripe phase in this system. The first part of this thesis describes the development of a new apparatus for performing quantum simulations with sodium and lithium in optical lattices. A …
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Periodically Modulated Electronic States in Natural Superlattices
… present the discovery of a new family of natural superlattices formed by an alternating stacking of transition metal dichalcogenide (TMD) monolayers and insulating spacer layers, that host such periodically modulated electronic states. We present experimental results from three members of this …
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Self-assembling nanocomposite Tectons for ordered superlattices
Nanocomposites, materials of heterogeneous composition with at least one of the phases having dimensions between 1-100 nm, can be produced with unique properties dependent on their composition and geometric configuration. However, it is a major challenge to precisely and simultaneously design the …
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Non-ideal exchange springs in DyFe2/YFe2 superlattices
… of molecular-beam-epitaxy (MBE)-grown DyFe2/YFe2 superlattices, two non-ideal processes are examined in this work. The first involves the anisotropy of the so-called hard pinning DyFe2 layer. At room temperature, the anisotropy of the Dy pinning ions is reduced substantially, and approaches that …
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Magneto - optical studies of quantum wells and superlattices
Contains fulltext : mmubn000001_028979664.pdf (Publisher’s version ) (Open Access)
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SPIN WAVES AND PHASE TRANSITIONS IN FERROMAGNETIC SUPERLATTICES
… and epitaxy, spin excitations in magnetic superlattices have been the subject of increasing interest in recent years. Much of this work is motivated by a desire to achieve technically useful characteristics, such as man-tailored superlattice materials, surface and interface condition probe …
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Antimonide-based type-II superlattices for infrared detection
The vast array of applications for the detection of mid- to long-wave infrared radiation has spurred continuous interest in new and novel technologies to replace the current generation of state-of-the-art devices such as mercury cadmium telluride (MCT) detectors. One of the more promising …
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Resonance raman scattering studies of GaAs-A1As superlattices
… and quantized LO phonons in several GaAs-AlAs superlattices. The motivation for this work was to study the electronic structure and the electron-phonon interaction in these structures. The samples were not intentionally doped. The Raman spectra of optic phonons were usually taken at a …
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Novel magnetic behavior in heavy rare earth superlattices
… properties of heavy rare earth films and superlattices synthesized by molecular beam epitaxy are investigated. Epitaxial films of rare earth metals, and superlattices of rare earths with Y interlayers, are grown along different hcp orientations using novel techniques developed specifically …
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Magnetic properties of Heisenberg antiferromagnetic EuTe/PbTe superlattices
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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Nonlinear and Chaotic Spatio-temporal Dynamics in Semiconductor Superlattices
Die Ladungsträgerdynamik in Halbleiterübergittern wird theoretisch auf der Grundlage eines semiklassischen sequentiellen Tunnelmodells untersucht. Abhängig von den Modellparametern ergeben sich dabei laufende oder stationäre Anreicherungs- und Verarmungsfronten der Elektronen. Besonders …
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Electronic and optical properties of semiconductor alloys and superlattices
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-02T18:04:23Z No. of bitstreams: 1 1986_ting.pdf: 8054944 bytes, checksum: c0ebc579813f805c94d27b704d6370c4 (MD5)
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Electronic, optical, and lattice properties of superlattices and heterostructures
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-05-18T14:35:39Z No. of bitstreams: 1 1989_chu.pdf: 8024583 bytes, checksum: ff256b7b8b05a483d9d7936f2cf1f346 (MD5)
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