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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"quantum spin systems"”.
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On numerical methods in quantum spin systems
… development of numerical methods for studying quantum many- body spin systems. Part I sets the stage for research projects. In chapter 1, I go over major milestones in the field of frustrated magnetism, how it fits into a larger category of condensed matter physics, and recent developments that …
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Improvements in cluster algorithms for quantum spin systems
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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Application of advanced diagonalization methods to quantum spin systems.
Quantum spin models play an important role in theoretical condensed matter physics and quantum information theory. One numerical technique that is frequently used in studies of quantum spin systems is exact diagonalization. In this approach, numerical methods are used to find the lowest eigenvalues …
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Inelastic Light Scattering in Low Dimensional Quantum Spin Systems
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-12T23:46:28Z No. of bitstreams: 1 Gozar.pdf: 7071735 bytes, checksum: 104d3ab2c4673de9bc2d71f8c52d0177 (MD5)
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Numerical simulation of quantum spin systems and experimental optimization
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-12-01
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Interactive Spin Dynamics in Magnon and Quantum Spin Systems
Spintronics utilizes the intrinsic spin of electrons to design next-generation electronic devices, reducing power consumption and enabling innovative computing functions. Over the past decades, significant research interest has been directed toward two types of spin-based systems: collective …
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String-net condensation and topological phases in quantum spin systems
… it has become clear that at zero temperature, quantum mechanics allows for the possibility of new phases of matter beyond the Landau paradigm. In this thesis, we develop a general theoretical framework for these "exotic phases" analogous to Landau's framework for symmetry breaking phases. We …
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Phase transition phenomena in quantum spin systems and in polyampholyte gels
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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Finite and infinite matrix product states for Gutzwiller projected mean-field wavefunctions and their applications to quantum spin systems
… disordered ground states of 2D or quasi-2D quantum spin systems has been an important research theme in recent years. Many of these states show exotic quantum orders that cannot be understood in the context of Landau-Ginzburg order parameters. With few exceptions, 2D analytical calculations …
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Eigenvalues and low energy eigenvectors of quantum many-body systems
… Matrix Product States (MPS) representation of quantum spin systems on a line with an improvement on the notation. The rest of this thesis is divided into two parts. The first part is devoted to eigenvalues of quantum many-body systems (QMBS). I introduce Isotropic Entanglement (IE) and show …
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Studies of Topology and Order in Frustrated Spin Systems
… between topology and order in frustrated quantum spin systems. We identify the relevant effects in the study of novel phases of matter, as they emerge in tractable quantum spin models, and we make several original contributions. In this dissertation, (a) we study quantum dimer models with …
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Magnon heat transport and magnon-hole scattering in one and two dimensions spin systems
… conductivity k_mag of the low dimensional quantum spin systems La2CuO4 and (Sr,Ca)14Cu24O41 with a focus on magnon hole scattering and its relevance for the magnetic heat transport has been investigated experimentally. In the two dimensional Heisenberg antiferromagnet La2CuO4 already slight …
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Spin-Phonon-Kopplung und Spin-Anregungen in quasi-eindimensionalen Spinsystemen
… has a history reaching back to the origin of quantum mechanics. The suppression of long-range order sets the stage for an enormous complexity of possible ground states and many-body states. The ground state is dominated by strong quantum fluctuations and pronounced spin-spin correlations. …
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Inelastic light scattering in low-dimensional spin systems
… obtained from a number of low-dimensional quantum spin systems using Raman spectroscopy have been presented. The main motivation of this thesis is to hunt for new types of elementary excitations which may be present in low-dimensional spin systems with exotic spin topology. The studied …
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Optimal control of quantum systems using dynamic programming
… on the optimal control of a class of closed 1 quantum systems. It encompasses and addresses the following themes 1. The theoretical underpinnings of the dynamic programming method for quantum spin systems. 2. The efficient numerical implementation of algorithms to generate optimal control laws. …
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Optimal control of quantum systems using dynamic programming
… on the optimal control of a class of closed 1 quantum systems. It encompasses and addresses the following themes 1. The theoretical underpinnings of the dynamic programming method for quantum spin systems. 2. The efficient numerical implementation of algorithms to generate optimal control laws. …
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Spectral and dynamical properties of disordered and noisy quantum spin models
… and dynamical characteristics of certain quantum spin systems in the presence of either I) quenched disorder, or II) dynamical noise. In the first part, the quantum random energy model (QREM), a mean-field spin glass model with a many-body localisation transition, is studied. In Chapter 2, …
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Simulating quantum systems on classical computers with matrix product states
… simulation of strongly-interacting many-body quantum-mechanical systems using matrix product states (MPS) is considered. Compared to classical systems, quantum many-body systems possess an exponentially enlarged number of degrees of freedom, significantly complicating a simulation on a …