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Showing 1 to 11 of 11 for “"antilocalization"”.
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Experimental Measurements by Antilocalization of the Interactions between Two-Dimensional Electron Systems and Magnetic Surface Species
Low-temperature weak-localization (WL) and antilocalization (AL) magnetotransport measurements are sensitive to electron interference, and thus can be used as a probe of quantum states. The spin-dependent interactions between controllable surface magnetism and itinerant electrons in a non-magnetic …
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Spin States in Bismuth and Its Surfaces: Hyperfine Interaction
… corrections to the conductivity due to weak antilocalization, which depend on the coherence of the spin state of the carriers. The carrier spin polarization is generated by a strong DC current in the Bi(111) surface states (here called the Edelstein effect), which then induces dynamic nuclear …
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Quantum-coherent transport in low-dimensional mesoscopic structures and thin films
… the phase coherence lengths were extracted from antilocalization signals. Antilocalization measurements provide a sensitive mean of probing the quantum mechanical correction to electronic transport. The phase coherence lengths increased as the wire length increased, due to reduction of the …
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Thermoelectric and electrical transport properties of Bi2Te3 compacted nanoparticles bulk material
… transport properties and a distinct weak antilocalization. A downwards trend in the electrical resistivity at temperatures below 5 K was attributed to an increase in the coherence length by applying the Hikami-Larkin-Nagaoka model. THz time-domain spectroscopy revealed a dominance of the …
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Spin-orbit or Aharonov-Casher edge states in semiconductor systems
… spin-orbit coupling constant α using the weak antilocalization analysis as a function of the side-gate voltage. We take the effect of the finite width into account and find the corrected values. With the simulation of electric fields in the wide channel and narrow channel, we found that the …
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Electronic Transport in Highly Mismatched InAs Films on GaAs
… with a dip at 0 field are observed, which is the antilocalization signal from accumulation electrons. This is a strong technique to probe the surface quantum states and derive the phase coherence length and the spin flip length of surface electrons.
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Quantum transport in mesoscopic systems of Bi and other strongly spin-orbit coupled materials
… systematically studied by analysis of the weak antilocalization transport signature, a quantum interference phenomenon sensitive to spin-orbit coupling. The "findings indicate that the phase coherence scales proportionally to the limiting dimension of the structure for sizes less than 500 nm. …
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Mesoscopic quantum interference experiments in InGaAs and GaAs two-dimensional systems
… system has strong spin-orbit interaction (SOI). Antilocalization in a Hall bar geometry was analyzed by the 2D Hikami-Larkin-Nagaoka (HLN) theory to obtain the spin coherence time and phase coherence time. The 2D hole systems we studied have low density and high mobility, quite different from the …
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Investigating electron transport in chemical vapor deposition graphene nanostructures
… transition from weak localization (WL) to weak antilocalization (WAL) is found around a certain carrier concentration due to surface roughness induced patches. This result provides insight into fabrication and operation of scalable graphene spintronic devices. Moreover, to further elucidate …
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Terahertz Spectroscopy of Topological Insulators and other 2-Dimensional Materials
… electrical transport measurements reveal weak antilocalization behavior in the Bi2Se3 sample, consistent with the presence of a topological surface state. Chapter 4, discusses the phase transition in a rather less considered TI, Sb2Te3, using THz-TDS. We track through a series of topological …
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Spin-Orbit Coupling in SrTiO3/Si Thin Films at High Carrier Concentration
Oxide heterostructure based on SrTiO3 have been a discovery ground for emergent physical phenomena, most notably conductivity at the interfaces between insulators. The 2DEG systems at the interface between SrTiO3 and in δ-doped SrTiO3 have been investigated intensely in the past decade. At the …