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 14 of 14 for “"mobility edge"”.
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Ultracold fermionic atoms in disordered potentials
… We provide the first measurement of how the mobility edge—a hallmark of 3-dimensionality—and of localization lengths depend on the disorder strength. In a second experimental study, we add an optical lattice to the disorder potential to realize the disordered Fermi-Hubbard model, which is a …
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Carrier transport in undoped and doped films of amorphous arsenic triselenide
… both the dark d.c. conductivity and hole drift mobility have been studied as a function of temperature and applied electric field. Measurements of the d.c. conductivity have been extended to lower temperatures than in previous studies (down to 165K as compared with 280K). A full discussion of …
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MOMENTUM SIGNATURES OF THE ANDERSON TRANSITION
… extract properties like critical exponent, the mobility edge and signatures of multifractality from this finite-time analysis. These momentum space signatures of the Anderson transition are novel and they promise to be experimental observables for wide range of systems, from cold atoms to …
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Electronic transport properties of thin films of amorphous silicon
… d.c. conductivity, electron drift mobility, transient and steady state photoconductivity and optical absorption experiments were carried out on thin films of amorphous Silicon. These measurements reveal wide variations in the electronic transport properties of specimens of amorphous …
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Transport and disorder-induced localization of ultracold Fermi gases
… the atoms are localized by the disorder, and a mobility edge is found separating localized from extended states. The length scale of the speckle is varied, and the localized state is found to scale linearly with the geometric mean of the speckle autocorrelation length. We realize the Fermi …
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Artificial Neural Networks as a Probe of Many-Body Localization in Novel Topologies
… of these classifications - in particular how the mobility edge is affected - are in agreement with heuristic expectations. This we use as a proof of concept that neural networks and, more generally, machine learning algorithms, endow physicists with powerful tools for the study of many-body …
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Numerical and Laboratory Studies of Ultrasonic Anderson Localization
… strength (W/V) ranging from 6.0 to 9.0. No mobility edge was found, indicating that all modes were exponentially localized regardless of the degree of disorder. The three-dimensional study was performed by scattering a beam of 7 MHz ultrasound at a cell containing a slurry of glass or PMMA …
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Steady state and transient photoconductivity in n-type amorphous silicon
… a shallow shoulder (-0.17eV below the conduction mobility edge) below which the density of states falls sharply.<br/><br/>Both the SSPC and the long time TPC results from the P-doped sample were interpreted in terms of a recombination model in which the recombination centres are exclusively …
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Optical and Electronic Interactions at the Nanoscale
… temperature, we also show that at 10 K the band-edge absorptive bleach is dominated by 1Sh hole occupation in the quantum dot interior. In the second study detailed here, we use this time-resolved photoluminescence apparatus to demonstrate an enhancement of radiative rates in cadmium sulfide …
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Hollow condensates, topological ladders and quasiperiodic chains
… and end by focusing on the physics of localized edge modes and topological phases in quasi-one-dimensional ladder models. For all three topics we maintain a focus on experimentally accessible, physically realistic systems and explicitly discuss experimental implementations of our work or its …
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Mocking quantum mechanics: Semiclassical and machine-learning approaches to frustrated magnetism
… and partially extended states coexist without a mobility edge.
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The cold atom toolbox in momentum space
… to this localization transition (single-particle mobility edge) in two ways: with the addition of more tunneling pathways, and by modifying the form of the potential. Finally, we have studied the effects of nonlinear inter-atomic interactions in the momentum-space lattice, observing self-trapping …
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Probing localized states distributions in semiconductors by Laplace transform transient photocurrent spectroscopy
… their electronic properties. The concept of the mobility edge and mobility gap is introduced and a definition of the density of electronic states (DOS) is given. The DOS will be referred to frequently in this work. Also charge transport and photoconductivity in amorphous semiconductors are …
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Numerical studies on many-body localization
… of these orbitals is maximal at the nose of the mobility edge. Also, the OPOs decay exponentially in real space, with a correlation length that increases at low disorder. In addition, we find that the probability distribution of the strength of the large-range coupling constants of the number …