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Non Equilibrium Dynamics Of Tunnel Coupled Superfluids
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Book Synopsis Non-equilibrium Dynamics of Tunnel-Coupled Superfluids by : Marine Pigneur
Download or read book Non-equilibrium Dynamics of Tunnel-Coupled Superfluids written by Marine Pigneur and published by Springer Nature. This book was released on 2020-08-28 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: The relaxation of isolated quantum many-body systems is a major unsolved problem of modern physics, which is connected to many fundamental questions. However, realizations of quantum many-body systems which are both well isolated from their environment and accessible to experimental study are scarce. In recent years, the field has experienced rapid progress, partly attributed to ultra-cold atoms. This book presents the experimental study of a relaxation phenomenon occurring in a one-dimensional bosonic Josephson junction. The system consists of two 1D quasi Bose-Einstein condensates of 87Rb, magnetically trapped on an atom chip. Using radio-frequency dressing, the author deforms a single harmonic trap, in which the atoms are initially condensed, into a double-well potential and realizes a splitting of the wave function. A large spatial separation and a tilt of the double-well enable the preparation of a broad variety of initial states by precisely adjusting the initial population and relative phase of the two wave packets, while preserving the phase coherence. By re-coupling the two wave packets, the author investigates tunneling regimes such as Josephson (plasma) oscillations and macroscopic quantum self-trapping. In both regimes, the tunneling dynamics exhibits a relaxation to a phase-locked equilibrium state contradicting theoretical predictions. The experimental results are supported with an empirical model that allows quantitative discussions according to various experimental parameters. These results illustrate how strongly the non-equilibrium dynamics differ from the equilibrium one, which is well described by thermodynamics and statistical physics.
Book Synopsis Non-equilibrium Dynamics of One-Dimensional Bose Gases by : Tim Langen
Download or read book Non-equilibrium Dynamics of One-Dimensional Bose Gases written by Tim Langen and published by Springer. This book was released on 2015-05-22 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents a series of experiments with ultracold one-dimensional Bose gases, which establish said gases as an ideal model system for exploring a wide range of non-equilibrium phenomena. With the help of newly developed tools, like full distributions functions and phase correlation functions, the book reveals the emergence of thermal-like transient states, the light-cone-like emergence of thermal correlations and the observation of generalized thermodynamic ensembles. This points to a natural emergence of classical statistical properties from the microscopic unitary quantum evolution, and lays the groundwork for a universal framework of non-equilibrium physics. The thesis investigates a central question that is highly contested in quantum physics: how and to which extent does an isolated quantum many-body system relax? This question arises in many diverse areas of physics, and many of the open problems appear at vastly different energy, time and length scales, ranging from high-energy physics and cosmology to condensed matter and quantum information. A key challenge in attempting to answer this question is the scarcity of quantum many-body systems that are both well isolated from the environment and accessible for experimental study.
Book Synopsis Universal Themes of Bose-Einstein Condensation by : Nick P. Proukakis
Download or read book Universal Themes of Bose-Einstein Condensation written by Nick P. Proukakis and published by Cambridge University Press. This book was released on 2017-04-27 with total page 663 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering general theoretical concepts and the research to date, this book demonstrates that Bose-Einstein condensation is a truly universal phenomenon.
Book Synopsis Quantum Gases: Finite Temperature And Non-equilibrium Dynamics by : Nick P Proukakis
Download or read book Quantum Gases: Finite Temperature And Non-equilibrium Dynamics written by Nick P Proukakis and published by World Scientific. This book was released on 2013-02-21 with total page 579 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 1995 observation of Bose-Einstein condensation in dilute atomic vapours spawned the field of ultracold, degenerate quantum gases. Unprecedented developments in experimental design and precision control have led to quantum gases becoming the preferred playground for designer quantum many-body systems.This self-contained 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. Thematically organised chapters on different methodologies, contributed by key researchers using a unified notation, provide the first integrated view of the relative merits of individual approaches, aided by pertinent introductory chapters and the guidance of editorial notes.Both graduate students and established researchers wishing to understand the state of the art will greatly benefit from this comprehensive and up-to-date review of non-equilibrium and finite temperature techniques in the exciting and expanding field of quantum gases and liquids./a
Book Synopsis Interferometry with Interacting Bose-Einstein Condensates in a Double-Well Potential by : Tarik Berrada
Download or read book Interferometry with Interacting Bose-Einstein Condensates in a Double-Well Potential written by Tarik Berrada and published by Springer. This book was released on 2015-12-17 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis demonstrates a full Mach–Zehnder interferometer with interacting Bose–Einstein condensates confined on an atom chip. It relies on the coherent manipulation of atoms trapped in a magnetic double-well potential, for which the author developed a novel type of beam splitter. Particle-wave duality enables the construction of interferometers for matter waves, which complement optical interferometers in precision measurement devices, both for technological applications and fundamental tests. This requires the development of atom-optics analogues to beam splitters, phase shifters and recombiners. Particle interactions in the Bose–Einstein condensate lead to a nonlinearity, absent in photon optics. This is exploited to generate a non-classical state with reduced atom-number fluctuations inside the interferometer. This state is then used to study the interaction-induced dephasing of the quantum superposition. The resulting coherence times are found to be a factor of three longer than expected for coherent states, highlighting the potential of entanglement as a resource for quantum-enhanced metrology.
Book Synopsis Novel Superfluids by : K. H. Bennemann
Download or read book Novel Superfluids written by K. H. Bennemann and published by International Monographs on Ph. This book was released on 2013-02-28 with total page 641 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reports on the latest developments in the field of Superfluidity, one of the most fundamental, interesting, and important problems in physics, with applications ranging from metals, helium liquids, photons in cavities, excitons in semiconductors, to the interior of neutron stars and the present state of the Universe as a whole.
Book Synopsis Basic Superfluids by : Tony Guenault
Download or read book Basic Superfluids written by Tony Guenault and published by CRC Press. This book was released on 2002-11-28 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superfluidity is the jewel in the crown of low temperature physics. When temperatures are low enough, every substance in thermal equilibrium must become ordered. Since some materials remain fluid to the lowest temperatures, it is a fascinating question as to how this ordering can take place. One possibility is the formation of a superfluid state, a
Download or read book Nature written by Sir Norman Lockyer and published by . This book was released on 2007 with total page 1692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Microscopic Theory of Superfluid He II and with Its QCE Superfluidity Mechanism Applied to Superconductors by : J. X. Zheng-Johansson
Download or read book The Microscopic Theory of Superfluid He II and with Its QCE Superfluidity Mechanism Applied to Superconductors written by J. X. Zheng-Johansson and published by Nova Publishers. This book was released on 2004 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors introduce the full content of the Microscopic Theory of Superfluid He II, developed since 1998; also given are brief accounts of the application of one concept from the theory, the QCE1 Superfluidity Mechanism, to superconductors. One peer review report writes: "The authors include more of the underlying physics than some earlier theories, and the comparisons they make with experimental data are satisfactory". The Microscopic Theory of Superfluid He II has several important features, which distinguishes this theory from the previous theories of He II. The immense volume of information the authors have today, especially the pieces of information revealing the microscopic dynamics of the system, was not available to the developers of the previous theories in the 1930s-1940s. This book also demonstrates how the general principles of quantum mechanics and condensed matter physics can be consistently applied to a given system with confidence, once a realistic microscopic model is derived for it. It demonstrates in turn the validity of the general physics principles in such an extreme system as the quantum fluid He II.
Book Synopsis Quantized Vortex Dynamics and Superfluid Turbulence by : C.F. Barenghi
Download or read book Quantized Vortex Dynamics and Superfluid Turbulence written by C.F. Barenghi and published by Springer Science & Business Media. This book was released on 2001-08-28 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book springs from the programme Quantized Vortex Dynamics and Sup- ?uid Turbulence held at the Isaac Newton Institute for Mathematical Sciences (University of Cambridge) in August 2000. What motivated the programme was the recognition that two recent developments have moved the study of qu- tized vorticity, traditionally carried out within the low-temperature physics and condensed-matter physics communities, into a new era. The ?rst development is the increasing contact with classical ?uid dynamics and its ideas and methods. For example, some current experiments with - lium II now deal with very classical issues, such as the measurement of velocity spectra and turbulence decay rates. The evidence from these experiments and many others is that super?uid turbulence and classical turbulence share many features. The challenge is now to explain these similarities and explore the time scales and length scales over which they hold true. The observed classical aspects have also attracted attention to the role played by the ?ow of the normal ?uid, which was somewhat neglected in the past because of the lack of direct ?ow visualization. Increased computing power is also making it possible to study the coupled motion of super?uid vortices and normal ?uids. Another contact with classical physics arises through the interest in the study of super?uid vortex - connections. Reconnections have been studied for some time in the contexts of classical ?uid dynamics and magneto-hydrodynamics (MHD), and it is useful to learn from the experience acquired in other ?elds.
Book Synopsis Quantum Field Theory of Non-equilibrium States by : Jørgen Rammer
Download or read book Quantum Field Theory of Non-equilibrium States written by Jørgen Rammer and published by Cambridge University Press. This book was released on 2011-03-03 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum field theory is the application of quantum mechanics to systems with infinitely many degrees of freedom. This 2007 textbook presents quantum field theoretical applications to systems out of equilibrium. It introduces the real-time approach to non-equilibrium statistical mechanics and the quantum field theory of non-equilibrium states in general. It offers two ways of learning how to study non-equilibrium states of many-body systems: the mathematical canonical way and an easy intuitive way using Feynman diagrams. The latter provides an easy introduction to the powerful functional methods of field theory, and the use of Feynman diagrams to study classical stochastic dynamics is considered in detail. The developed real-time technique is applied to study numerous phenomena in many-body systems. Complete with numerous exercises to aid self-study, this textbook is suitable for graduate students in statistical mechanics and condensed matter physics.
Book Synopsis Novel Physical Phenomena in Correlated Superfluids and Superconductors In- and Out-of-equilibrium by : Kirmani A. Ammar
Download or read book Novel Physical Phenomena in Correlated Superfluids and Superconductors In- and Out-of-equilibrium written by Kirmani A. Ammar and published by . This book was released on 2020 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: Condensed Matter Physics studies the states of matter in solids. Perhaps one of the most interesting physical phenomena are realized when materials are cooled down to very low temperatures, so that the principles of quantum mechanics together with the inter-particle correlations lead to the emergence of novel states of matter. In my work, I have successfully used the methods of Quantum Field Theory and Computational Physics to study and predict the novel phases of strongly correlated fermionic systems. In particular, I have explored the emergence of temporal and spatial phases in quantum mechanical systems ranging from degenerate atomic condensates to iron-based superconductors at very low temperatures. In this document, I will provide the details of my work with the specific examples of the fascinating problem of superfluid order parameter dynamics in fermionic condensates driven out-of-equilibrium, spatial phases in novel superfluids, and calculations of Josephson's interface between two iron-based superconductors.
Book Synopsis The Superfluid Phases of Helium 3 by : Dieter Vollhardt
Download or read book The Superfluid Phases of Helium 3 written by Dieter Vollhardt and published by Courier Corporation. This book was released on 2013-10-17 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt: This classic of modern theoretical physics is the first and only comprehensive treatment of the superfluid phases of helium 3, a crucial aspect of condensed matter physics with applications to many other fields. The self-contained approach explores ideas, concepts, and theoretical results, emphasizing symmetries and the consequences of their spontaneous breakdown. 1990 edition.
Book Synopsis B Phase Nucleation and A-B Interface Dynamics in Superfluid Helium-3 by : John Peter Palmeri
Download or read book B Phase Nucleation and A-B Interface Dynamics in Superfluid Helium-3 written by John Peter Palmeri and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis deals with the theory of the primary nucleation and subsequent expansion of the superfluid $sp3$He-B phase in the metastable, hypercooled A phase. An overview of the theory of dynamical phenomena in Fermi superfluids is presented in Chapter 1 with an eye towards formulating a theory suitable for studying the dynamics of the first order A-B phase transition. The mechanism for the primary B phase nucleation in the metastable A is not at all understood, and in Chapter 2 various possibilities are discussed, although no resolution to the problem is reached. The focus here is on an exotic non-equilibrium, cosmic ray, which involves non-hydrodynamic heat transport in a state far from equilibrium. Chapter 3 deals with some idealized, model transport problems inspired by the physics behind the cosmic-ray mechanism, and it is shown that certain non-hydrodynamic dynamical structures similar to the ones needed in the cosmic-ray mechanism can form in these model problems. An application of superfluid kinetic equations to the nonlinear, dissipative motion of the A-B interface is discussed in Chapter 4; in particular, the mobility of the phase boundary is obtained in several different dynamical regimes (depending on temperature and pressure), including the (currently) experimentally relevant ballistic regime where the Andreev scattering of normal excitations off the moving interface strongly influences the dynamics. The theoretical prediction for the terminal velocity is too big by a factor $sim$2, and possible reasons for this discrepancy are discussed. A study of the stability and vibrations of the interface is presented in Chapter 5, where we argue that (1) the moving planar interface is linearly stable and (2) it should be possible to observe underdamped vibrations of a pinned interface at low temperatures. Finally, in Chapter 6 we point out other possible applications of the dynamical theory formulated here and list some open problems.
Download or read book Physics Briefs written by and published by . This book was released on 1994 with total page 1248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1016 pages. Available in PDF, EPUB and Kindle. Book excerpt:
