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Showing 1 to 17 of 17 for “"Landau-Zener"”.
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Experiments in vibro-impact beam dynamics and a system exhibiting a landau-zener quantum effect
… This report also includes the setup for a Landau-Zener Tunneling experiment involving two pendulums, one with fixed length and one with variable length. The experimental setup and tools used will be described, and some experimental results showing agreement with analytical data will be …
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Effects of dissipative environments on some quantum systems
… surface, and the transition probability of the Landau-Zener level crossing. Chapter one contains a general introduction to these physical systems and a brief review of the theoretical methods I shall use. The study of an equilibrium property, the persistent current of a metallic ring coupled to …
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Topological Signatures for the Kitaev Chain in and out of Equilibrium
… phase transitions, drawing connections to the Landau-Zener framework and the Kibble-Zurek mechanism where applicable. Particular emphasis is placed on the excitation density, the evolution of geometric phases, and the role of symmetries in constraining the dynamics. These ideas are explored in …
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Effects of dissipative environments on some quantum systems
… surface, and the transition probability of the Landau-Zener level crossing.
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Kinetics and radiative processes of a xenon and iodine inductive RF discharge at low pressure
… to ion-ion neutralization consistent with the Landau-Zener theory of ion-ion neutralization. Decay of the electron density is also hundreds of microseconds for the same discharge. Electron-ion recombination leading to excited states is not an important source of emission in the discharge at …
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Development of Optoelectronic Devices and Computational Tools for the Production and Manipulation of Heavy Rydberg Systems
… are compared with calculations based on the Landau-Zener formula, with discussion of its limitations. Further computational work is focused on simulating expected conditions in the implementation of the STIRAP technique for coherent control of atoms and molecules in the beam experiment. The …
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The dynamics of ultracold atoms in light-induced synthetic gauge fields
… found the behavior to be well understood by the Landau-Zener (LZ) theory. Various parameters of the SO coupled BEC were explored, and we demonstrated the ability to use such LZ transitions as the basis of an atomic transistor.^ Finally, we created a novel type of 3π spin-orbit coupling for …
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Studies of Highly Polar Atomic and Molecular Systems: Quantum Dynamics and the Route to Experimental Investigations
… crossing and this is compared with the classic Landau-Zener result, and the commonly encountered spin-flip problem of a particle with spin located in a rotating magnetic field. This approach is applied to the avoided crossing between the n = 13, n1 − n2 = 11 (dipole moment of 532 D) and the n = …
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Kinetics and radiactive processes of a XE and I2 inductive RF discharge at low pressure
… to ion-ion neutralization consistent with the Landau-Zener theory of ion-ion neutralization. Decay of the electron density is also hundreds of microseconds for the same discharge. Electron-ion recombination leading to excited states is not an important source of emission in the discharge at …
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Dissociative charge transfer of organic molecules induced by collisions with the He+ cation. A joint experimental and theoretical study of relevance for the interstellar medium evolution
… ~10 eV higher than the HOMO. An improved Landau-Zener-StÃ1⁄4ckelberg model has been developed to obtain the total integral cross-section to be compared with the experimental results. Inter-molecular interaction and electron densities of the orbitals involved in the reaction turned out to …
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Molecular beam studies of excitation and electron transfer reactions
… conditions. This result was reproduced in Landau-Zener calculations of the nonadiabatic probabilities and the ratio of the cross sections.
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Development of large scale tight-binding methods, and application to electron transfer in symmetric dielectric barrier discharges (DBDS)
… under AC voltage, is a particular case of the Landau-Zener avoided level-crossing model, where electron transfer occurs between localized states due to time-dependent resonance. We first show that the temporal profile of current-voltage obtained from this model are consistent with experimental …
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Strongly nonlinear dynamics and acoustics of coupled granular sonic vacua: theoretical and experimental studies
… in a macroscopic analogue of the well-known Landau-Zener Quantum effect in space. The aforementioned mechanisms of energy transfer and redirection in highly nonlinear granular chains are conceptually new and were presented for the first time. Analytical and computational studies of these …
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The multi Davydov-Ansatz
… vicinity of an avoided crossing in a dissipative Landau-Zener model. In particular, we reveal that the final transition probability can be tuned by coupling to the environment for both diagonal and off-diagonal coupling. By appropriately adjusting the initial excitation of the system, the final …
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Theoretical and experimental studies of the dynamics and acoustics of forced ordered granular networks
… realization of the spatial analog of the Landau-Zener quantum tunneling effect. This is realized by finite stratification of the elastic foundation of the excited chain, and depends on the system parameters (e.g., the percentage of stratification) and on the parameters of the periodic …
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Revisiting physics of quantum bits
Advancements in the technology of quantum bits invoke more precise calculations for decoherence and dissipative effects. In this thesis, the physics of truncated two level systems is revisited and it is shown that in some systems, such as in triple-junction superconducting flux qubit, environmental …