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Magnetic Field Effects in Low-Dimensional Quantum Magnets

2018-11-28 Science
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Release : 2018-11-28
Genre : Science
Kind : eBook
Book Rating : 032/5 ( reviews)

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Book Synopsis Magnetic Field Effects in Low-Dimensional Quantum Magnets by : Adam Iaizzi

Download or read book Magnetic Field Effects in Low-Dimensional Quantum Magnets written by Adam Iaizzi. This book was released on 2018-11-28. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is a tour-de-force combination of analytic and computational results clarifying and resolving important questions about the nature of quantum phase transitions in one- and two-dimensional magnetic systems. The author presents a comprehensive study of a low-dimensional spin-half quantum antiferromagnet (the J-Q model) in the presence of a magnetic field in both one and two dimensions, demonstrating the causes of metamagnetism in such systems and providing direct evidence of fractionalized excitations near the deconfined quantum critical point. In addition to describing significant new research results, this thesis also provides the non-expert with a clear understanding of the nature and importance of computational physics and its role in condensed matter physics as well as the nature of phase transitions, both classical and quantum. It also contains an elegant and detailed but accessible summary of the methods used in the thesis—exact diagonalization, Monte Carlo, quantum Monte Carlo and the stochastic series expansion—that will serve as a valuable pedagogical introduction to students beginning in this field.

Characterizing Ground States of Low-dimensional Quantum Magnets

2013
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Release : 2013
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Kind : eBook
Book Rating : 262/5 ( reviews)

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Book Synopsis Characterizing Ground States of Low-dimensional Quantum Magnets by : Hyejin Ju

Download or read book Characterizing Ground States of Low-dimensional Quantum Magnets written by Hyejin Ju. This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt: The study of frustration in quantum magnetism has been the focus of extensive research in the past couple of decades. The class of materials in this category is typically strongly correlated, due to strong electron-electron repulsion. In one- and two-dimensions, quantum fluctuations dominate these systems, and often, semi-classical approximations become an oversimplification. This thesis is concerned with exploring exotic physics that can emerge in low-dimensional quantum magnets. First, we use a T = 0 projected Monte Carlo algorithm in the valence bond basis to study the entanglement scaling of two-dimensional (2d) gapless systems. In particular, we focus on the resonating-valence-bond wavefunction as well as the gapless Goldstone mode in the Heisenberg model on the square lattice. We find that, in addition to the area law, there is a subleading, shape-dependent piece to the entanglement entropy, which is reminiscent of one dimensional (1d) gapless systems. We then explore the Heisenberg model under an applied magnetic field on the quasi-1d problem of a three-leg triangular spin tube (TST), using extensive density-matrix-renormalization group calculations coupled with analytical arguments to describe the results. We find that the physics describing this model differs from some of the well-known results on the two dimensional lattice, especially near low magnetic fields and at 1/3 magnetization. Finally, further research and possibilities in numerical techniques are discussed.

Fundamentals of Low Dimensional Magnets

2022-08-29 Science
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Release : 2022-08-29
Genre : Science
Kind : eBook
Book Rating : 175/5 ( reviews)

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Book Synopsis Fundamentals of Low Dimensional Magnets by : Ram K. Gupta

Download or read book Fundamentals of Low Dimensional Magnets written by Ram K. Gupta. This book was released on 2022-08-29. Available in PDF, EPUB and Kindle. Book excerpt: A low-dimensional magnet is a key to the next generation of electronic devices. In some respects, low-dimensional magnets refer to nanomagnets (nanostructured magnets) or single-molecule magnets (molecular nanomagnets). They also include the group of magnetic nanoparticles, which have been widely used in biomedicine, technology, industries, and environmental remediation. Low-dimensional magnetic materials can be used effectively in the future in powerful computers (hard drives, magnetic random-access memory, ultra-low power consumption switches, etc.). The properties of these materials largely depend on the doping level, phase, defects, and morphology. This book covers various nanomagnets and magnetic materials. The basic concepts, various synthetic approaches, characterizations, and mathematical understanding of nanomaterials are provided. Some fundamental applications of 1D, 2D, and 3D materials are covered. This book provides the fundamentals of low-dimensional magnets along with synthesis, theories, structure-property relations, and applications of ferromagnetic nanomaterials. This book broadens our fundamental understanding of ferromagnetism and mechanisms for realization and advancement in devices with improved energy efficiency and high storage capacity.

High Magnetic Field Science and Its Application in the United States

2013-12-25 Science
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Release : 2013-12-25
Genre : Science
Kind : eBook
Book Rating : 344/5 ( reviews)

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Book Synopsis High Magnetic Field Science and Its Application in the United States by : National Research Council

Download or read book High Magnetic Field Science and Its Application in the United States written by National Research Council. This book was released on 2013-12-25. Available in PDF, EPUB and Kindle. Book excerpt: The Committee to Assess the Current Status and Future Direction of High Magnetic Field Science in the United States was convened by the National Research Council in response to a request by the National Science Foundation. This report answers three questions: (1) What is the current state of high-field magnet science, engineering, and technology in the United States, and are there any conspicuous needs to be addressed? (2) What are the current science drivers and which scientific opportunities and challenges can be anticipated over the next ten years? (3) What are the principal existing and planned high magnetic field facilities outside of the United States, what roles have U.S. high field magnet development efforts played in developing those facilities, and what potentials exist for further international collaboration in this area? A magnetic field is produced by an electrical current in a metal coil. This current exerts an expansive force on the coil, and a magnetic field is "high" if it challenges the strength and current-carrying capacity of the materials that create the field. Although lower magnetic fields can be achieved using commercially available magnets, research in the highest achievable fields has been, and will continue to be, most often performed in large research centers that possess the materials and systems know-how for forefront research. Only a few high field centers exist around the world; in the United States, the principal center is the National High Magnetic Field Laboratory (NHMFL). High Magnetic Field Science and Its Application in the United States considers continued support for a centralized high-field facility such as NHFML to be the highest priority. This report contains a recommendation for the funding and siting of several new high field nuclear magnetic resonance magnets at user facilities in different regions of the United States. Continued advancement in high-magnetic field science requires substantial investments in magnets with enhanced capabilities. High Magnetic Field Science and Its Application in the United States contains recommendations for the further development of all-superconducting, hybrid, and higher field pulsed magnets that meet ambitious but achievable goals.

Magnetic Heat Transport in Low-dimensional Quantum Magnets

2012
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Release : 2012
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Book Rating : 371/5 ( reviews)

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Book Synopsis Magnetic Heat Transport in Low-dimensional Quantum Magnets by : Marian Otter

Download or read book Magnetic Heat Transport in Low-dimensional Quantum Magnets written by Marian Otter. This book was released on 2012. Available in PDF, EPUB and Kindle. Book excerpt:

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