Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 98 for “"Spin Systems"”.
-
Studies in random Ising spin systems
We give a brief survey of Ising spin systems in the presence of random bonds or random fields. Specific calculations are done on the twodimensional short-ranged random-bond model and the three-dimensional random-field model. The phenomenological renormalization group and the transfer-matrix method …
-
On numerical methods in quantum spin systems
… 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 provide context …
-
Quantum control of spin systems in diamond
… We take advantage of a long-lived nuclear spin as an ancillary spin to protect the qubit of interest from decoherence. We show that the protocol protects the qubit as long as open-loop dynamical decoupling control schemes and it can be used against more general types of noise than the …
-
Quantum information processing in multi-spin systems
Coherence and entanglement in multi-spin systems are valuable resources for quantum information processing. In this thesis, I explore the manipulation of quantum information in complex multi-spin systems, with particular reference to Nuclear Magnetic Resonance implementations. In systems with a few …
-
Efficient Parallelization of 2D Ising Spin Systems
… problem of efficient parallelization of 2D Ising spin systems requires realistic algorithmic design and implementation based on an understanding of issues from computer science and statistical physics. In this work, we not only consider fundamental parallel computing issues but also ensure that …
-
Asymptotic phase diagrams for lattice spin systems
… the low temperature expansions. We consider spin Iattice systems described by a Hamiltonian with a d-dimensional perturbation space. We prove that there is a one-one correspondence between subsets of the phase diagram and extremal elements of some family of convex sets. We also solve a linear …
-
Inelastic light scattering in low-dimensional spin systems
… 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 systems can …
-
Improvements in cluster algorithms for quantum spin systems
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
-
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 …
-
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 …
-
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)
-
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
-
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 …
-
Exploring large coherent spin systems with solid state NMR
… (NMR) allows us to explore a large coherent spin system and provides an ideal test-bed for studying strongly interacting multiple-spin system in a large Hilbert space. In this thesis, we experimentally investigate the spin dynamics in a rigid lattice of dipolarly coupled nuclear spins using …
-
Engineering coherent control of quantum information in spin systems
… context of magnetic resonance for: (i) nuclear spins of small molecules in solution and (ii) nuclear and electron spins in single crystals. The power of QIP is compromised in the presence of decoherence. One method of protecting information from collective decoherence is to limit the quantum …
-
String-net condensation and topological phases in quantum spin systems
For many years, it was thought that Landau's theory of symmetry breaking could describe essentially all phases and phase transitions. However, in the last twenty years, it has become clear that at zero temperature, quantum mechanics allows for the possibility of new phases of matter beyond the …
-
Spin Systems far from Equilibrium: Aging and Dynamic Phase Transition
… as possible, we study in both cases simple spin systems. Using Monte Carlo simulations we first investigate aging in three-dimensional Ising spin glasses as well as in two-dimensional Ising models with disorder quenched to low temperatures. The time-dependent dynamical correlation length …
-
Time-dependent properties of one-dimensional spin-systems : a DMRG-study
… and time-dependent properties of one-dimensional spin systems. Two different kinds of DMRG algorithms have been applied, and improved or generalized. In the correction vector DMRG used to calculate dynamical structure factors, the most time-consuming step is to solve a system of complex linear …
-
Photonic integration of electron-nuclear spin systems in semiconductor quantum dots
… interface of an electron and the nuclear spins within an optically active QD. Here we integrate the electron-nuclear spin system of a semiconductor QD into an open microcavity. We report progress on three fronts towards the generation of multidimensional photonic cluster states: First, we …
Page 1 of 5