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 29 for “"Spin Chains"”.
-
Prethermalization and localization in quantum spin chains
… ordered (OTO) correlations in nuclear spin systems with magnetic resonance techniques. Hamiltonian engineering enables tuning the strength of spin-spin interactions and of a transverse magnetic field in a spin chain system, as well as to invert the Hamiltonian sign to reveal OTO …
-
Quantum mechanical studies of Heisenberg antiferromagnetic spin chains
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1999.
-
Dynamical correlations of S=1/2 quantum spin chains
Spin-1/2 chains demonstrate some of the striking effects of interactions and quantum fluctuations in one-dimensional systems. The XXZ model has been used to study the unusual properties of anisotropic spin chains in an external magnetic field. The zero temperature phase diagram for this model …
-
Strong zero Modes in Generalized Spin chains and Topological Quantum Computation
… existing methods for constructing zero modes in spin chains and enlightens common surprising features of these types of constructions. This opens up the way for future research on the subject.
-
Transition from integrable to chaotic domain in spectra of spin chains
… integrable-chaotic transition in the Heisenberg spin model. We consider three ways to break the integrability: presence on an external field on a single spin, coupling of an external random field with each spin in the chain and next nearest neighbor interaction between spins. We propose a …
-
Explorations of engineered bosonic systems in ultracold atoms, oscillator networks, quantum spin chains, and space
DSpace SAF Submission Ingestion Package generated from Vireo submission #21359 on 2025-03-28 at 14:25:59
-
One-dimensional bosonization approach to higher dimensions
… liquid. Another example is a quantum spin Hall system with helical edge states, which are also described by a Tomonaga-Luttinger liquid. In our first work, a study of magnetized edge states of quantum spin-Hall system is presented. A magnetic field dependent signature of such edges is …
-
Physical challenges of quantum computation
… In chapter 3, quantum information transfer over spin chains is then discussed. A proof about the most efficient way to transfer quantum information in one dimension is constructed. In chapter 4, we shall consider the effects of quantum correlation induced by quantum mechanical environments on the …
-
Quantum simulation of many-body dynamics
… contexts: Bose-Fermi mixtures, dissipative spin chains, and nuclear magnetic resonance (NMR) spectroscopy experiments.
-
Efficient classical simulation of spin networks
… of quantum adiabatic computation, instances of spin networks with 2-local interactions could hopefully efficiently compute certain problems in NP-complete. Thus, we are interested in the adiabatic evolution of spin networks. There are analytical solutions to specific Hamiltonians for 1D spin …
-
Grundzustandseigenschaften von anisotropen antiferromagnetischen Heisenberg-Ketten mit Spin S = 1
In this thesis ground state properties of S = 1 spin chains with exchange and single-ion anisotropy are analysed. Following earlier publications two cases are mainly considered: A fixed ratio of the two anisotropies as well as a fixed and strong exchange anisotropy. The method primarily employed is …
-
Chaos and Thermalization in Quantum Many-Body Systems and Gravity
… from subsystems, in chaotic systems ranging from spin chains and quantum field theories to black holes. For evaporating black holes, the equilibrium approximation for entanglement entropy provides a systematic derivation of certain recent prescriptions for addressing Hawking’s information loss …
-
Entanglement entropy in integrable quantum systems
… compute the scaling of the entanglement of such spin chains. In the fifth article we study the scaling of various twist field correlation functions in order to compute the entanglement entropy and the logarithmic negativity in free boson massive theories.
-
Quasi-one-dimensional magnetism in TiOCl and a theory of a lightly doped dimerized insulator
… on this material indicating two-dimensional spin-liquid behavior are reviewed critically and are compared to new susceptibility data. The latter suggest a new picture, where band structure effects produce quasi-one-dimensional spin chains formed by t2g orbitals. Based on these findings, TiOC1 …
-
Eigenvalues and low energy eigenvectors of quantum many-body systems
… 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 that the …
-
An Exploration of Quantum Critical Phenomena in One-Dimensional Lattice Systems: Geometric Frustration & Quantum Fluctuations
… phenomena within one-dimensional quantum lattice spin systems. People are exposed to classical critical phenomena everyday in the form of phase transitions, such as from water to ice. Surrounding quantum phase transitions, there is a number of exciting phenomena still to be explored, enhancing our …
-
Improved Tools for Local Hamiltonians
… computational problems related to many-body spin systems with a structured energy operator, a local Hamiltonian. We begin with the most structured setting where the Hamiltonian has a spectral gap and spatial locality. This setting is widely studied using approximate ground space projectors …
-
Strukturelle und magnetische Eigenschaften der Cu-Divanadate sowie verwandter, niedrigdimensionaler Verbindungen
… ions (S=1/2) forms different one dimensional chains and two dimensional networks. Thus, the research was motivated by the search of new low-dimensional spin systems and the research of the influence of different Cu-topology or Cu-O-coordination on the magnetic behaviour. The Cu ions in CuV2O6 …
-
Investigation of Frustrated Quasi-One-Dimensional Quantum Spin-Chain Materials
… configuration) quasi-one-dimensional quantum spin-chain compounds. Both compounds crystallize with tetragonal structures containing edge sharing CuO6 octahedra chains which experience Jahn-Teller distortions. The basal planes of the octahedra link together to form CuO2 ribbon-chains which …
Page 1 of 2