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Showing 1 to 20 of 21 for “"alkali atoms"”.
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Ultrafast Dynamics and Nonlinear Interactions in Alkali Atoms and Diatomics
… and delayed probe pulses are introduced into the alkali vapor. Analyses of the UV emission line profiles show excellent agreement with the four-wave mixing process.
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Modelling and Exploiting the Hyperfine Structure of Alkali Atoms for Generation of Nonclassical Light and Rydberg-Atom-Based Field Sensing
Alkali atoms are a workhorse in quantum optics, owing to the relative simplicity of their elec- tronic structure, which affords remarkable and reliable control over their behaviour. In particular, the ability to probe and manipulate alkali atoms with electromagnetic fields provides an important …
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Theory of Quantum Degenerate Gases
"Motivated by experiments on cold alkali atoms, I present a theoretical study of weakly interacting quantum degenerate particles. These experiments observe a wide range of phenomena and consequently this thesis has a broad scope, involving issues of coherence, stability, superfluidity, and …
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Alkali Rydberg States in Electromagnetic Fields
We study highly excited hydrogen and alkali atoms (’Rydberg states’) under the influence of a strong microwave field. As the external frequency is comparable to the highly excited electron’s classical Kepler frequency, the external field induces a strong coupling of many different quantum …
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Strong Magnetic Field Effects and Molecular Processes with Applications to White Dwarfs
<p>Radiative transitions of hydrogenlike atoms in external magnetic fields of strength applicable to magnetic white dwarfs, i.e. B < 10<sup>3</sup> megagauss, have been investigated for field-free principal quantum numbers n < 6. Finite proton mass corrections are included. Relativistic corrections …
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Optical and spin coherence properties of Rb atoms in solid neon for magnetic field sensing
… sensor utilizing a matrix isolation system. Alkali atoms implanted in rare-gas matrices have been proposed for quantum sensing, fundamental physics measurements, and dark matter detection. Prior work shows that the electron spin state of alkali atoms in the inert gas matrix can be optically …
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Long-distance quantum communication with neutral atoms
… have the common feature of employing neutral atoms for storage/processing and photons for qubit transmission. For most of these systems, there is a lack of a precise performance analysis to enable a comparison between different scenarios from a top-level system standpoint. One main goal of …
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Exploring spin physics with ultracold atoms
… networks, and more. Experiments with ultracold alkali atoms in optical lattices have realized spin models with great success. In particular, the isotropic Heisenberg model---the XXX model---was realized more than a decade ago. The ⁷Li apparatus described here was the first to realize a tunable, …
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Manipulation and control of ultra-cold rubidium atoms
… been designed and implemented to confine neutral atoms in microscopic dipole traps and to manipulate their internal states by laser excitation to Rydberg states. A lot of effort was devoted to the stabilization of the laser sources for two-photon excitation to the Rydberg states, using techniques …
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Optical Characterization of chemically doped and/or intercalated thin layers graphene: Raman and Contrast Study
… layers of graphene with halogen gases, FeCl₃ and alkali metals. The first chapter introduces graphene and graphite intercalation compounds (GICs). It will also briefly explain Raman of the graphitic compounds including GICs. The second chapter presents doping status of halogen molecules doped …
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Measurement of Hyperfine Coupling Constants of the 5d²D₃/₂ and 5d²D₅/₂ Levels in Atomic Cesium Using Polarization Quantum Beat Spectroscopy
… explained by a simple hydrogenic picture of the alkali atoms such as cesium [1-3]. More precise experimental results and theoretical treatments are in demand for the alkali elements, especially for atomic cesium because of its wide range of applications. Therefore, it is essential to understand …
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High temperature crystal chemistry of hydrous Mg- and Fe-rich cordierites
… maps for type II water. A peak ascribed to the alkali atoms that centers the six-membered ring becomes elongated parallel to a upon heating through 375°C, while the peak ascribed to the oxygen associated with H2O is absent in the Mg-cordierite at 775°C and in the Fe-cordierite at 375°C. After …
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Rare gas alkali ionic excimers
The rare gas alkali ionic molecules are established as a new class of ionic excimers which emit in the vacuum ultraviolet (VUV) regime of the electromagnetic spectrum. Temporal and spectral characteristics of these species with (XeRb)$\sp{+}$ at 164 nm and (XeCs)$\sp{+}$ at 160 nm have been …
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Spin coherence and optical properties of alkali-metal atoms in solid parahydrogen
Trapped gas phase atoms and molecules are the leading experimental platformsfor applications such as quantum computation, quantum sensing, and tests of fundamental physics. There is active research in solid-state electron spin systems for these applications. Nitrogen-vacancy centers in diamond, …
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Experimental Studies of LiRb: Spectroscopy and Ultracold Molecule Formation by Photoassociation
… and quantum simulations. Heteronuclear bi-alkali molecules, only a small subset of polar molecules, have received special attention mainly because the constituent alkali atoms are easy to laser cool and can be relatively easily associated to form molecules at ultracold temperatures. Our …
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BEC-BCS crossover with Feshbach resonance for three-hyperfine-species model
… us to tune the effective interaction between alkali atoms. In a Feshbach resonance, the effective s-wave scattering length grows when one moves toward the resonance point, and eventually diverges at this point. There is one characteristic energy scale, $\delta_c$, defined as, in the negative …
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Numerical methods for cold atom systems
… degenerate regimes in dilute ultracold atomic alkali-gases. In these dilute systems, interactions are characterized by a single parameter, the s-wave scattering length. In this dissertation, we review the physics of quantum degenerate atomic gases from a theoretical perspective and present the …
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Study of the properties of dilute Fermi gases in the strongly interacting regime
… gases can be created in the laboratories using alkali atoms. These gases can be in different regimes of density and interaction strength and provide an ideal test bed for the basic properties of the quantum and statistical mechanics. Also some astrophysical objects such as neutron stars can be …
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Semiconductor-generated entangled photons for hybrid quantum networks
… Efficient quantum memories can be realized using alkali atoms such as rubidium. Leading in the deterministic generation of single photons and polarization entangled photon pairs are semiconductor InAs/GaAs quantum dots grown by the Stranski-Krastanov method. Despite remarkable progress in the last …
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