Full Download Tunneling Dynamics in Open Ultracold Bosonic Systems: Numerically Exact Dynamics Analytical Models Control Schemes - Axel U.J. Lode | PDF
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In our experiments with ultracold bosonic rubidium atoms in optical matter models as well as questions of quantum many-body dynamics (more). Include the direct observation of atom co-tunneling of repulsively interacting atoms,.
This thesis explores the quantum many-body tunneling dynamics of open ultracold bosonic systems with the recently developed multiconfigurational.
The dynamics of a few ultracold bosons tunneling from a one-dimensional potential well into an open space is studied. In such a system several decay channels can be distinguished, each corresponding to a different number of bosons escaping simultaneously.
A semi-empirical model is proposed to quantify the tunneling currents through ultrathin gate oxides (1-3.
We investigate the mechanism in the tunneling dynamics of open ultracold few-boson systems by numerically solving the time-dependent few-boson schrödinger equation exactly. By starting from a weakly repulsive, initially coherent two-boson system we demonstrate that the decay dynamics incorporate fragmentation. The wavefunction of the tunneling state exhibits a pronounced dynamically-stable.
The study of dynamical tunneling in a periodically driven anharmonic potential probes the quantum-classical transition via the experimental control of the effective planck’s constant for the system. In this paper we consider the prospects for observing dynamical tunneling with ultracold atoms in magnetic microtraps on atom chips.
Let w be the junction width and ξ be either the healing length of the condensate or the de broglie wavelength of a thermal cloud. As long as ξw, the dynamics can be described using the local density approximation. On the other hand, when ξ w, one reaches the tunnel-junction limit.
Springer, this thesis addresses the intriguing topic of the quantum tunnelling of many-body systems such as bose-einstein condensates. Despite the enormous amount of work on the tunneling of a single particle through a barrier, we know very little about how a system made of several or of many particles tunnels through a barrier to open space.
Drag reduction, wind tunnel, piv, hotwire, turbulent boundary layer.
◦ group: theoretical chemistry, heidelberg university, germany.
Autores: juan polo gomez directores de la tesis: verónica ahufinger (dir. ) lectura: en la universitat autònoma de barcelona ( españa ) en 2016.
The present work uses numerically exact solutions of the time-dependent many-boson schrödinger equation to explore the rich physics of the tunneling to open space process in ultracold bosonic particles that are initially prepared as a bose-einstein condensate and subsequently allowed to tunnel through a barrier to open space.
This thesis explores the quantum many-body tunneling dynamics of open ultracold bosonic systems with the recently developed multiconfigurational time-dependent hartree for bosons (mctdhb) method.
May 14, 2019 the results show that tunnel, resonance and virtual state effects enhance within the ultra-cold domain (below 1 mk), the reactivity is governed by virtual function of the fluorine atom to account for its open-shel.
Tunneling can be studied by monitoring the correlations and coherence in ultracold atomic gases. For this purpose, the initial state of an ultracold atomic gas of bosons is prepared coherently in a parabolic trapping potential which is subsequently trans-formed to an open shape allowing for tunneling (fig.
Second-order tunneling was achieved in a small-scale system by studying the tunneling dynamics of bosonic atoms in an array of separated double wells [11,12]. Ina recent experiment, these two regimes have been connected by splitting a fermionic mott insulator into individual double wells.
Jul 22, 2020 the team observed ultracold atoms tunnelling through a laser beam, and their experiment provides important clues in a long-standing mystery.
Polaron problems in ultracold atoms: role of a fermi sea across different spatial entanglement-assisted tunneling dynamics of impurities in a double well.
Jun 15, 2020 this video will demonstrate an example for applying a circular template to be used for conduit casing or tunneling.
Magnetization relaxation caused by superexchange and tunneling dynamics has also been studied in bosonic systems in two-dimensional lattices magnetic many-body models still pose many open challenges that might be addressed by ultracold atom quantum simulators in the future.
The detailed microscopic understanding of interacting many-particle quantum dynamics in state-of-the-art experiments with ultracold atoms [1,2,3,4,5,6,7,8,9,10] in well-characterized potential landscapes remains a challenging task for theory: while a large arsenal of advanced numerical techniques has been developed over the past two decades to efficiently simulate interacting many-particle.
Quantum tunnelling or tunneling (us) is the quantum mechanical phenomenon where a classical dynamics is then said to be mixed and the system phase space is once the two voltage energies align, the electrons flow like an open wire.
Abstract: we investigate the mechanism in the tunneling dynamics of open ultracold few-boson systems by numerically solving the time-dependent few-boson schr\odinger equation exactly. By starting from a weakly repulsive, initially coherent two-boson system we demonstrate that the decay dynamics incorporate fragmentation.
In particular, the high degree of experimental control over these systems allows detailed studies of tunneling dynamics,.
Org controlling the velocities and number of emitted particles in the tunneling to open space dynamics.
Multi-mode quench quantum dynamics of ultracold bosons: wish list.
The transmission of an interacting bose-einstein condensate incident on a repulsive gaussian barrier is investigated through numerical simulation. The dynamics associated with interatomic interactions are studied across a broad parameter range not previously explored. Effective one-dimensional gross-pitaevskii equation (gpe) simulations are compared to classical boltzmann-vlasov equation (bve.
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