Mixtures Of Ultracold Gases
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: |
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: |
Total Pages |
: |
Release |
: 2012 |
ISBN-10 |
: OCLC:932130220 |
ISBN-13 |
: |
Rating |
: 4/5 (20 Downloads) |
Synopsis Bose-Fermi Mixtures of Ultracold Gases of Dysprosium by :
Author |
: F. Schreck |
Publisher |
: |
Total Pages |
: 218 |
Release |
: 2002 |
ISBN-10 |
: 2868836976 |
ISBN-13 |
: 9782868836977 |
Rating |
: 4/5 (76 Downloads) |
Synopsis Mixtures of Ultracold Gases by : F. Schreck
Author |
: Cheng-Hsun Wu (Ph. D.) |
Publisher |
: |
Total Pages |
: 212 |
Release |
: 2013 |
ISBN-10 |
: OCLC:865506001 |
ISBN-13 |
: |
Rating |
: 4/5 (01 Downloads) |
Synopsis Strongly Interacting Quantum Mixtures of Ultracold Atoms by : Cheng-Hsun Wu (Ph. D.)
This thesis describes the construction of a new apparatus for ultracold quantum gases as well as the scientific results this machine has produced so far. This new apparatus is capable of simultaneously cooling and trapping lithium, sodium, and potassium. It therefore provides a platform to study a large variety of quantum mixtures. Three main experimental results are presented. Firstly, the direct cooling of "K to Bose-Einstein condensation is presented. Then the 41K atoms provide the coolant for 6Li and 40K, achieving a triply degenerate gas of 6Li -40K -41K. In particular, a broad interspecies Feshbach resonance between 40K -41K is observed, opening a new pathway to study a strongly interacting isotopic Bose-Fermi mixture of 40K -41K. Secondly, a new Bose-Fermi mixture of 23Na -40K is introduced. We show that 23Na is a very efficient coolant for 40K by sympathetically cooling 40K to quantum degeneracy with the help of a 23Na condensate. Moreover, over thirty interspecies Feshbach resonances are identified, paving the way to study strongly interacting Bose- Fermi problems, in particular the Bose polaron problem. Thirdly, we report on the first formation of ultracold fermionic Feshbach molecules of 23Na40K by radio-frequency association. The lifetime of the nearly degenerate molecular gas exceeds 100 ms in the vicinity of the Feshbach resonance. The NaK molecule features chemical stability in its ground state in contrast to the case of the KRb molecule. Therefore, our work opens up the prospect of creating chemically stable, fermionic ground state molecules of 23Na40K where strong, long-range dipolar interactions will set the dominant energy scale. Finally, the thesis concludes with an outlook on future topics in polaron physics and quantum dipolar gases, which can be studied using the new apparatus.
Author |
: Zoe Ziyue Yan |
Publisher |
: |
Total Pages |
: 213 |
Release |
: 2020 |
ISBN-10 |
: OCLC:1241733529 |
ISBN-13 |
: |
Rating |
: 4/5 (29 Downloads) |
Synopsis From Strongly-interacting Bose-Fermi Mixtures to Ultracold Molecules by : Zoe Ziyue Yan
This thesis describes experiments on ultracold quantum gases. First, I discuss quantum simulation involving mixtures of bosonic and fermionic atoms. Second, I present work on creating and controlling ultracold dipolar molecules of 23Na40K. The rich phase diagram of Bose-Fermi mixtures was studied with our system of bosonic 23Na and fermionic 40K atoms. When the fermions were immersed as a minority species within a Bose-Einstein condensate, the system realized the canonical Bose polaron quasiparticle, which is an important paradigm in condensed matter physics. We investigated the strongly-coupled Bose polaron as it approached the quantum critical regime of the Bose-Fermi mixture. Using radiofrequency spectroscopy, we probed the binding energy and decay rate as a function of temperature. In particular, the decay rate was found to scale linearly with temperature near the Planckian rate k[subscript B]T/h− in the unitarity-limited regime, a hallmark of quantum critical behavior. Bose-Fermi mixtures host a complex spectrum of collective excitations, which can shed light on their properties such as collisional relaxation rates, equilibrium equations of state, and kinetic coefficients. We probed the low-lying collective modes of a Bose-Fermi mixture across different interaction strengths and temperatures. The spin-polarized fermions were observed to transition from ballistic to hydrodynamic flow induced by interactions with the bosonic excitations. Our measurements establish Bose-Fermi mixtures as a fruitful arena to understand hydrodynamics of fermions, with important connections to electron hydrodynamics in strongly-correlated 2D materials. The second part of this thesis describes the creation and manipulation of ultracold molecules in their ground state. Molecules have more tunable degrees of freedom compared to atoms, paving the way for studies of quantum state-controlled chemistry, quantum information, and exotic phases of matter. We created loosely-bound Feshbach molecules from ultracold atoms, then transferred those molecules to their absolute electronic, vibrational, rotational, and hyperfine ground state by stimulated Raman adiabatic passage. The rotational level structure, sample lifetimes, and coherence properties were studied, culminating in a demonstration of second-scale nuclear spin coherence times in an ensemble of NaK. Controlling the intermolecular interactions - which can be tunable, anisotropic, and long range - is an outstanding challenge for our field. We induced strong dipolar interactions via the technique of microwave dressing, an alternative to using static electric fields to polarize the molecules. The origin of these dipolar collisions was the resonant alignment of the approaching molecules' dipoles along their intermolecular axis, resulting in strong attraction. Our observations were explained by a conceptually simple two-state picture based on the Condon approximation.
Author |
: Jesper Fevre Bertelsen |
Publisher |
: |
Total Pages |
: 149 |
Release |
: 2007 |
ISBN-10 |
: OCLC:475075279 |
ISBN-13 |
: |
Rating |
: 4/5 (79 Downloads) |
Synopsis Ultracold Atomic Gases by : Jesper Fevre Bertelsen
Author |
: Irakli Titvinidze |
Publisher |
: Sudwestdeutscher Verlag Fur Hochschulschriften AG |
Total Pages |
: 156 |
Release |
: 2010-10 |
ISBN-10 |
: 3838120949 |
ISBN-13 |
: 9783838120942 |
Rating |
: 4/5 (49 Downloads) |
Synopsis Dynamical Mean-Field Theory Approach for Ultracold Atomic Gases by : Irakli Titvinidze
In this thesis we have studied the physics of different ultracold Bose-Fermi mixtures in optical lattices, as well as spin 1/2 fermions in a harmonic trap. To study these systems we generalized dynamical mean-field theory for a mixture of fermions and bosons, as well as for an inhomogeneous environment. Generalized dynamical mean-field theory is a method that describes a mixture of fermions and bosons. This method consists of Gutzwiller mean-field for the bosons, and dynamical mean-field theory for the fermions which are coupled on-site by the Bose-Fermi density-density interaction and possibly a Feshbach term which converts a pair of up and down fermions into a molecule, i.e. a boson. Real-space dynamical mean-field theory incorporates the effect of an inhomogeneous environment caused e.g by a harmonic trap. The crucial difference of this generalized formalism to the standard DMFT is that every lattice site is treated differently due to the inhomogeneity in the system. Different sites are coupled by the real-space Dyson equation.
Author |
: Matthias Weidemüller |
Publisher |
: John Wiley & Sons |
Total Pages |
: 519 |
Release |
: 2011-02-10 |
ISBN-10 |
: 9783527635078 |
ISBN-13 |
: 3527635076 |
Rating |
: 4/5 (78 Downloads) |
Synopsis Interactions in Ultracold Gases by : Matthias Weidemüller
Arising from a workshop, this book surveys the physics of ultracold atoms and molecules taking into consideration the latest research on ultracold phenomena, such as Bose Einstein condensation and quantum computing. Several reputed authors provide an introduction to the field, covering recent experimental results on atom and molecule cooling as well as the theoretical treatment.
Author |
: Kathy Levin |
Publisher |
: Elsevier |
Total Pages |
: 225 |
Release |
: 2012-11-15 |
ISBN-10 |
: 9780444538628 |
ISBN-13 |
: 0444538623 |
Rating |
: 4/5 (28 Downloads) |
Synopsis Ultracold Bosonic and Fermionic Gases by : Kathy Levin
The rapidly developing topic of ultracold atoms has many actual and potential applications for condensed-matter science, and the contributions to this book emphasize these connections. Ultracold Bose and Fermi quantum gases are introduced at a level appropriate for first-year graduate students and non-specialists such as more mature general physicists. The reader will find answers to questions like: how are experiments conducted and how are the results interpreted? What are the advantages and limitations of ultracold atoms in studying many-body physics? How do experiments on ultracold atoms facilitate novel scientific opportunities relevant to the condensed-matted community? This volume seeks to be comprehensible rather than comprehensive; it aims at the level of a colloquium, accessible to outside readers, containing only minimal equations and limited references. In large part, it relies on many beautiful experiments from the past fifteen years and their very fruitful interplay with basic theoretical ideas. In this particular context, phenomena most relevant to condensed-matter science have been emphasized. - Introduces ultracold Bose and Fermi quantum gases at a level appropriate for non-specialists - Discusses landmark experiments and their fruitful interplay with basic theoretical ideas - Comprehensible rather than comprehensive, containing only minimal equations
Author |
: Nick Proukakis |
Publisher |
: World Scientific |
Total Pages |
: 579 |
Release |
: 2013 |
ISBN-10 |
: 9781848168121 |
ISBN-13 |
: 1848168128 |
Rating |
: 4/5 (21 Downloads) |
Synopsis Quantum Gases by : Nick Proukakis
This volume provides a broad overview of the principal theoretical techniques applied to non-equilibrium and finite temperature quantum gases. Covering Bose-Einstein condensates, degenerate Fermi gases, and the more recently realised exciton-polariton condensates, it fills a gap by linking between different methods with origins in condensed matter physics, quantum field theory, quantum optics, atomic physics, and statistical mechanics.
Author |
: Tobias Gerard Tiecke |
Publisher |
: |
Total Pages |
: 152 |
Release |
: 2009 |
ISBN-10 |
: 9090249001 |
ISBN-13 |
: 9789090249001 |
Rating |
: 4/5 (01 Downloads) |
Synopsis Feshbach Resonances in Ultracold Mixtures of the Fermionic Quantum Gases 6Li and 40K by : Tobias Gerard Tiecke