Low-Dimensional Quantum Spin Systems

Title: Ergodicity from Nonergodicity in Quantum Correlations of Low.
(PDF) Quantum Spin Liquid | George Rajna - A.
Low Dimensional Magnetism | LNS | Paul Scherrer Institut (PSI).
Pulse-field Experiments on The Spin-lattice Interaction in Low.
Low-dimensional quantum systems.
Physica E: Low-Dimensional Systems and Nanostructures.
Physica E: Low-dimensional Systems and Nanostructures.
Quantum dynamics of a mobile spin impurity | Nature Physics.
Low-dimensional quantum systems - Lancaster EPrints.
Spin-Wave Calculations for Low-Dimensional Magnets.
Quantum magnetism in low dimensional spin systems.
PDF One-dimensional quantum spin dynamics of Bethe string states.
The Fascinating World of Low-Dimensional Quantum Spin Systems.
Exact solution of two-dimensional (2D) Ising model with... - ScienceDirect.

Title: Ergodicity from Nonergodicity in Quantum Correlations of Low.

Whilst bulk metallic and semiconducting systems have been to date major material stages to realize the aforementioned concepts, low-dimensional materials systems such as atomically-flat two-dimensional materials [1-3], two-dimensional electron gases formed at an interface of a heterostructure [4,5], topologically-protected Dirac surface states.

(PDF) Quantum Spin Liquid | George Rajna - A.

Low-dimensional quantum spin systems are interacting many body systems for which several rigorous results are known. Powerful techniques like the Bethe Ansatz provide exact knowledge of the ground state energy and low-lying excitation spectrum. A large number of compounds exist which can effectively be described as low-dimensional spin systems.

Low Dimensional Magnetism | LNS | Paul Scherrer Institut (PSI).

The term low-dimensional systems, which is used in the title of this volume, refers to those systems which contain at least one dimension that is intermediate between those characteristic ofatoms/molecules and those ofthe bulk material. Depending on how many dimensions lay within this range, we generally speak of quantum wells, quantum wires. Ergodicityfrom Nonergodicityin Quantum Correlations of Low-dimensional Spin R. Prabhu, Aditi Sen(De), and Ujjwal Sen Harish-Chandra Research Institute, Chhatnag Road, Jhunsi, Allahabad 211 019, India. PHYSICS OF QUANTUM MATERIALS 1 Quantum magnetism in low dimensional spin systems Helge ##Rosner#, Manuel Brando , Dijana Milosavljević, Jörg Sichelschmidt, Michael Baenitz Low-dimensional quantum magnets provide a unique possibility to study ground and excited states of a large variety of quantum models with very high accuracy [1].

Pulse-field Experiments on The Spin-lattice Interaction in Low.

This thesis on correlation e ects in low-dimensional quantum many-particle systems is organized as follows. Chapters 1-6 give a review over existing literature on the physical systems and methods that are treated in the thesis. In Chapter 1 we discuss the paradigms that have domi-nated condensed matter physics for much of the 20th century, and the. Part of the Advances in Solid State Physics book series (ASSP,volume 43) Abstract Low-dimensional quantum spin systems display fascinating excitation spectra. In recent years, optical spectroscopy was shown to be a powerful tool for the study of these spectra by means of phonon-assisted infrared absorption.

Low-dimensional quantum systems.

Computater tutorials on quantum Monte Carlo methods and applications. • Theory Winter School, National High Magnetic Field Laboratory, Tallahassee, Florida, January 9-13, 2012. Two lectures: 1) Stochastic Series Expansion Algorithms for Quantum Spin Systems 2) Quantum Monte Carlo simulations of deconﬁned quantum criticality. Such solvable model systems can be realized by low-dimensional quantum magnets when the exchange interactions J between localized spins are effectively restricted to one or two dimensions. A particularly important model is the spin-1/2 XXZ chain. H = ∑ i [J(SxiSxi + 1 + SyiSyi + 1 + ΔSziSzi + 1) + gμBμ0→H→Si] (1) Here, →Si is the. We provide a detailed comparison between the dynamics of high-temperature spatiotemporal correlation functions in quantum and classical spin models. In the quantum case, our large-scale numerics are based on the concept of quantum typicality, which exploits the fact that random pure quantum states can faithfully approximate ensemble averages, allowing the simulation of spin-$1/2$ systems with.

Physica E: Low-Dimensional Systems and Nanostructures.

This thesis develops new techniques for simulating the low-energy behaviour of quantum spin systems in one and two dimensions. Combining these developments, it subsequently uses the formalism of tensor network states to derive an effective particle description for one- and two-dimensional spin systems that exhibit strong quantum correlations. Quantum spin systems are insulating crystals containing regular array of atoms carrying spin S = 1/2 or 1, described by simple spin Hamiltonians. In low-dimensional model compounds, we study by Nuclear Magnetic Resonance (NMR), which is a microscopic probe to magnetism, the magnetic-field-induced "exotic" phases, such as the Bose-Einstein. Jun 26, 2017 · Bajnok – Ads/CFT Correspondence From an Integrable Point of View. Bajnok – Finite Volume Diagonal Form Factors and AdS/CFT. Batchelor – The Mixed Ferro-Antiferromagnetic 3-state Quantum Potts Chain, Quantum Chiral Clock Model and Free Parafermions. Braak – Integrable and Non-Integrable Models in Quantum Optics.

Physica E: Low-dimensional Systems and Nanostructures.

Abstract. Abstract. This paper presents an overview of the properties of magnetic insulators, with emphasis on quantum effects. In particular, the consequences of strong quantum fluctuations on the low-energy properties of a number of systems are reviewed: the occurrence of a spin gap in spin-1 chains and other low-dimensional magnets; the presence of low-lying singlet excitations in several. Sep 15, 2010 · Low-dimensional quantum magnetism has provided the condensed matter community with some remarkable and compelling paradigms of "quantum-disordered" phases - states of matter where quantum mechanical fluctuations, even at the lowest possible temperatures, lead to a "melting" of classical order. At issue is how to characterize these disordered. When global spin rotational invariance is not broken, the conventional spin-wave theory is inapplicable. To proceed, a modified spin-wave theory for low-dimensional quantum magnetic systems is formulated under the constraint of zero magnetization. This theory can describe disordered state directly, and can be generalized to the ordered phase by identifying the magnetic ordering with the Bose.

Quantum dynamics of a mobile spin impurity | Nature Physics.

Apr 01, 2004 · In this contribution we present and discuss our results for selected low-dimensional compounds such as the homogeneous antiferromagnetic Heisenberg spin chain Cu (II)-bispyrazoldihydroxybenzene,. Quantum dynamics of strongly correlated systems is a challenging problem. Although the low energy fractional excitations of one-dimensional integrable models are often well understood, exploring quantum dynamics in these systems remains challenging in the gapless regime, especially at intermediate and high energies. Title: Ergodicity from Nonergodicity in Quantum Correlations of Low-dimensional Spin Systems. Authors: R. Prabhu, Aditi Sen De, Ujjwal Sen (Submitted on 20 Mar 2011) Abstract: Correlations between the parts of a many-body system, and its time dynamics, lie at the heart of sciences, and they can be classical as well as quantum. Quantum.

Low-dimensional quantum systems - Lancaster EPrints.

Several exactly solvable quantum spin models with incommensurate magnetic structures, which manifest quantum phase transitions between incommensurate and commensurate phases, are proposed. The ground-state and thermodynamic characteristics of these quantum spin antiferromagnetic models with the Dzyaloshinsky-Moriya antisymmetric exchange interaction and spin-frustrating next-nearest-neighbor.

Spin-Wave Calculations for Low-Dimensional Magnets.

Spintronics is the physics of low-dimensional quantum spin systems. The eld of low-dimensional magnetism was established in the wake of quantum mechanics through two ground-breaking theoretical achievements: rst, the introduction of the one-dimensional Ising model in 1925 [11], and second, the exact calculation of the ground.

Quantum magnetism in low dimensional spin systems.

Low-dimensional quantum spin systems. Physica E: Low-dimensional systems and nanostructures contains papers and invited review articles on the fundamental and applied aspects of physics in. No items have been added yet! 82 items. 13 items. 158 items.

PDF One-dimensional quantum spin dynamics of Bethe string states.

Mar 10, 2021 · In recent times, ab initio density functional theory has emerged as a powerful tool for making the connection between models and materials. Insulating transition metal oxides with a small spin forms a fascinating class of strongly correlated systems that exhibit spin-gap states, spin-charge separation, quantum criticality, superconductivity, etc. Recall that a q-form symmetry acts on a (D − q)-dimensional manifold M D − q in a system of spatial dimension D. A global symmetry is 0-form regardless of D, for instance. In the case of SET qubits, a topological twist is equivalent to a corresponding Wilson loop operation. Mapping thed dimensional quantum system onto aclassical contour system on ad+1 dimensional lattice, we use standard Pirogov-Sinai theory to show that the low temperature phase diagram of the quantum spin system is a small perturbation of the zero temperature phase diagram of the classical HamiltonianH (0), provided λ is sufficiently small. Our.

The Fascinating World of Low-Dimensional Quantum Spin Systems.

Recent years have shown important and spectacular convergences between techniques traditionally used in theoretical physics and methods emerging from modern mathematics (combinatorics, probability theory, topology, algebraic geometry, etc). These techniques, and in particular those of low-dimensional statistical models, are instrumental in improving our understanding of emerging fields, such. Low-dimensional quantum spin systems are interacting many body systems for which several rigorous results are known. Powerful techniques like the Bethe Ansatz provide exact knowledge of the ground state energy and low-lying excitation spectrum. A large number of compounds exist which can effectively be described as low-dimensional spin systems. This book covers all principal aspects of currently investigated frustrated systems, from exactly solved frustrated models to real experimental frustrated systems, going through renormalization group treatment, Monte Carlo investigation of frustrated classical Ising and vector spin models, low-dimensional systems, spin ice and quantum spin glass.

Exact solution of two-dimensional (2D) Ising model with... - ScienceDirect.

Low Dimensional Magnetism Project details In quantum spin systems the classical ferro- or antiferro-magnetic ground states are suppressed by strong quantum fluctuations, which become increasingly relevant towards zero temperature. The study of such systems is at the forefront of condensed matter physics.