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Showing 1 to 19 of 19 for “"Aharonov-Bohm"”.
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Properties of Type-II ZnTe/ZnSe Submonolayer Quantum Dots Studied via Excitonic Aharonov-Bohm Effect and Polarized Optical Spectroscopy
… magneto-photoluminescence, including excitonic Aharonov-Bohm (AB) effect and polarized optical spectroscopy as the primary tools in this work.</p> <p>I present previous studies as well as the background of optical and magneto-optical processes in semiconductor nanostructures and introduce the …
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On Quantum Effects of Vector Potentials and Generalizations of Functional Analysis
… dissertation in two parts. In the first one, the Aharonov-Bohm effect is investigated. It is shown that solenoids (or flux lines) can be seen as barriers for quantum charges. In particular, a charge can be trapped in a sector of a long cavity by two flux lines. Also, grids of flux lines can …
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QUANTUM TRANSPORT WITH COLD ATOMS
… gauge fields. We show that this so-called Aharonov-Bohm effect is absent for bosonic atoms. Within atomic Y-junctions, we find negative reflections that resemble Andreev-reflections known from metal-superconductor interfaces. Further, we show that topological pumping within atomic ring …
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A nanofabricated amplitude-division electron interferometer in a transmission electron microscope
… reconstruction, and demonstration of the Aharonov-Bohm effect. However, wavefront-division interferometry is limited by the requirement of high source coherence. Amplitude-division electron interferometers, first demonstrated by Marton and co-workers in 1954, can overcome this limitation. …
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Optical spectroscopy of single-walled carbon nanotubes in high magnetic fields
… influence its electronic structure through the Aharonov-Bohm (AB) effect, causing bandgap oscillations and absorption peaks splitting. In order to verify these predictions, near infrared (NIR) photoluminescence (PL) and visible-NIR absorption in the Voigt geometry were measured at room …
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Mesoscopic wave phenomena in electronic and optical ring structures
… von Elektronen über einen externen Aharonov-Bohm-Fluß erlaubt. Optische mesoskopische Systeme sind Thema von Teil II dieser Arbeit. Wir betrachten zweidimensionale annulare Strukturen, charakterisiert durch unterschiedliche Brechungsindizes, sowohl im klassischen Bild der …
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Novel electromagnetic scattering phenomena
… fields enables us to observe the non-Abelian Aharonov-Bohm effect with classical waves and classical fluxes, relevant for classical and quantum topological phenomena.
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Experimental Observation of Geometric Phases in Narrow-Gap Semiconductor Heterostructures
… transport measurements, and observed evidence of Aharonov-Bohm (AB) and Alâ tshuler-Aronov-Spivak (AAS) quantum oscillations in meso- scopic devices that we fabricated on these NGSs. Our measurements are unique in that we observe both AB and AAS in comparable magnitude in ballistic networks with …
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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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Quantum transport theory of 3D time-reversal invariant topological insulators
… surface transport corrugated TI channels, the Aharonov-Bohm effect in TI nanowires, supercurrent in TI Josephson junctions, and the superconducting proximity effect and resulting transport in TI-superconductor heterostructures. In doing so, we expand the understanding of quantum and mesoscopic …
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Quantum-coherent transport in low-dimensional mesoscopic structures and thin films
… from the amplitudes of the quantum-mechanical Aharonov-Bohm oscillations. The side gates allow for an in-plane controllable electric field. Asymmetrically biased side-gate voltages allow for the breaking of the two-dimensional parity symmetry of the ring device, effectively resulting in reduced …
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Quantum simulations in interacting Rydberg synthetic dimensions
… These include interaction-driven breakdown of Aharonov-Bohm caging in flat-band geometries, disorder-induced localization arising from randomly varying interaction strengths, and interaction-assisted topological pumps that show quantized transport at the few-body level. By dynamically …
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Interaction effects in quantum interferometers
… obtain that the interferometer operates in the Aharonov-Bohm regime with a flux periodicity halved with respect to the usual expectation, as recently observed. We do not find evidence for a connection between a reduced flux period and electron pairing, though. Then, we compute electron shot …
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Phase coherent transport phenomena in HgTe quantum well structures
… e.g., a ring shaped structure to investigate the Aharonov-Bohm and related effects. Due to the fact, that all experiments, described in this thesis, were performed on Hg-based samples, the exceptional position of such samples among the “classical” semiconductors has been clarified. Hg1-xMnx Te …
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Mesoscopic quantum interference experiments in InGaAs and GaAs two-dimensional systems
… The single ring interferometer yields pronounced Aharonov-Bohm (AB) oscillations with magnetic flux periodicity of h/e over a wide range of magnetic field. The periodicity was confirmed by Fourier transformation of the oscillations. The AB oscillation amplitude shows a quasi-periodic modulation …
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Electron dynamics in surface acoustic wave devices
… the transmission of an electron through an Aharonov-Bohm (AB) ring. It will be seen that an important property of the techniques used in this thesis is that they can be easily adapted to study realistic geometries, and we will see features in the AB oscillations which do not arise in …
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Investigating electron transport in chemical vapor deposition graphene nanostructures
… temperature. Single-electron behaviors such as Aharonov-Bohm effect and Coulomb blockade effect are observed, whereas signatures of the effective antidots proved elusive, probably due to the disorder-broadening of the Landau levels. Finally, for the purpose of fast readout of charge and spin …
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Topological phases of matter
… winds around a loop excitation acquires an Aharonov Bohm phase. In the thesis, we introduce a new braiding statistics, which we called the Borromean-Rings braiding statistics. It is a particle-loop-loop braiding statistics where a particle travels around two unlinked loops acquires a …
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Topological effects in particle physics phenomenology
… come in one of two types, which we refer to as `Aharonov-Bohm' (AB) and `Wess-Zumino' (WZ) terms. We derive a new condition for their $G$-invariance, which we call the `Manton condition', which is necessary and sufficient when the Lie group $G$ is connected. Armed with this classification of …