Low Dimensional Quantum Spin Systems

06.01.2022

Quantum criticality in the spin-1/2 Heisenberg chain system copper.
Introduction to low-dimensional systems | Semiconductor Physics Group.
Physica E: Low-dimensional Systems and Nanostructures.
Low-dimensional spin S = 1/2 system at the quantum critical limit: Na2V3O7.
Observation of phase transition with lattice distortion in the low.
PDF Quantum Monte Carlo Studies of Some Low-Dimensional Quantum Many.
PDF Renormalization Group Approaches to Low-Dimensional Systems.
Low-dimensional Quantum Spin Systems | SpringerLink.
Browse Articles | Nature Materials.
Spin-dependent electron-electron interaction in Rashba materials.
Jordan-wigner Fermionization and The Theory of Low-dimensional Quantum.
Numerical study of thermal effects in low dimensional quantum spin systems.
Low-dimensional quantum systems from novel constituents.
PDF Chapter 14 Low-Dimensional Nanostructures - Western Michigan University.

Quantum criticality in the spin-1/2 Heisenberg chain system copper.

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 exists which can effectively be described as low-dimensional spin systems. The aim of this conference is to bring together experts from various areas of solid state quantum physics with specializations in quantum transport in low-dimensional systems (2D, 1D and 0D). This will be an opportunity for both academia and industries to seek new future possibilities in the emerging solid state quantum technologies and nano. Here is a discussion of the state of the art of spin resonance in low dimensional structures, such as two-dimensional electron systems, quantum wires, and quantum dots. Leading scientists report on recent advances and discuss open issues and perspectives.

Introduction to low-dimensional systems | Semiconductor Physics Group.

First, we investigate a phase transition in graphene, one of the most famous two-dimensional systems in condensed matter. For a suspended bilayer graphene in ν = 0 quantum Hall regime, the conductivity data and mean-field analysis suggests a phase transition from an antiferromagnetic (AF) state to a valence bond solid (VBS) state, when.

Physica E: Low-dimensional Systems and Nanostructures.

Low-dimensional Quantum Systems. 8-9 Nov 2018 Vandoeuvre les Nancy (France)... Semi-classical perspective on dynamics of correlations in quantum spin models with long-range interactions... 15:30 - 16:00: Coffee break 16:00 - 16:30: TBA - Romain Dubessy 16:30 - 17:00: Quantum quench dynamics in systems with unconventional excitations - Tommaso. The 2017 "Advances in Quantum Transport in Low Dimensional Systems" conference, organized by the IOP Nanoscale Physics and Technology Group will be held September 4-5 at University College London, London UK. Key dates are: Abstract submission deadline: 15 June 2017 Early registration deadline: 28 July 2017 Registration deadline: 25 August 2017 More information can be found on the website. In this thesis, I use a quantum Monte Carlo (QMC) method based on the stochastic series expansion (SSE) to study transport, quantum phase diagrams, and dynamics of several one- and quasi-one-dimensional spin systems, including spin-1/2 and spin-1 chains, a frustrated four-leg spin tube, and N-leg spin-1/2 ladders.

Low-dimensional spin S = 1/2 system at the quantum critical limit: Na2V3O7.

We study the spin-Peierls (SP) transition of one-dimensional chain polymeric complexes coupled to lattice by means of many-body Green's function theory. The chain effective elastic constant is an intrinsic factor that determines the order of SP transition. It is found that the SP transition temperature T(SP) and the susceptibility-maximum temperature T(max) are in agreement with the.

Observation of phase transition with lattice distortion in the low.

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. Jun 23, 2022 · A general method by controlling reaction kinetics is proposed to synthesize 67 kinds of two-dimensional crystal with custom-made phases and compositions, in particular, Fe- and Cr-based (layered. Physica E: Low-dimensional systems and nanostructures contains papers and invited review articles on the fundamental and applied aspects of physics in low-dimensional electron systems, in semiconductor heterostructures, oxide interfaces, quantum wells and superlattices, quantum wires and dots, novel quantum states of matter such as topological insulators, and Weyl semimetals.

PDF Quantum Monte Carlo Studies of Some Low-Dimensional Quantum Many.

The fabrication of low-dimensional structures is introduced in Section 2. In Section 3 some general features of quantum phenomena in low dimensions are discussed. The remainder of the chapter is devoted to particular low-dimensional quantum systems, organized by their "dimension." 2. Making Low-Dimensional Quantum Structures. 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. The coupling between spin, charge, and. 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.

PDF Renormalization Group Approaches to Low-Dimensional Systems.

Introduction. Low-dimensional magnets have long been a playground for discovering unconventional physics. 1-3 From an experimental point of view, ideal systems have strong magnetic coupling in one- or two-dimensional units, which are well isolated from each other. This includes magnetic chains, which are hosts to spinon quasi-particles that fractionalise electrons by carrying their spin but. These open the door to new understandings of quantum gases and spin systems, beyond the traditional observables and states. This special issue will be the first collection of articles putting together the wealth of new ideas in the hydrodynamics of one-dimensional quantum systems.

Low-dimensional Quantum Spin Systems | SpringerLink.

Two-dimensional (2D) quantum materials offer a unique platform to explore mesoscopic phenomena driven by interfacial and topological effects. Their tunable electric properties and bidimensional nature enable their integration into sophisticated heterostructures with engineered properties, resulting in the emergence of new exotic phenomena not accessible in other platforms. We present electron-spin-resonance data of ${\\mathrm{Ti}}^{3+}$ ${(3d}^{1})$ ions in single crystals of the novel layered quantum spin magnet TiOCl. The analysis of the g tensor yields direct evidence that the ${d}_{\\mathrm{xy}}$ orbital from the ${t}_{2g}$ set is predominantly occupied and owing to the occurrence of orbital order a linear spin chain forms along the crystallographic b axis. Low-dimensional spin S = 1/2 system at the quantum critical limit: Na2V3O7. Gavilano JL(1), Rau D, Mushkolaj S, Ott HR, Millet P, Mila F.... nonmetallic low dimensional spin system. Our results indicate that, upon reducing the temperature to below 100 K, the V4+ moments are gradually quenched, leaving only one moment out of nine active..

Browse Articles | Nature Materials.

In the context of the actual system of interest, we consider low-dimensional sys-tems throughout this thesis – systems in two-dimension to be precise. The dimension-ality of our system is relevant, since the quantum ﬂuctuation in general gets stronger in lower dimensions. This means that the mean-ﬁeld theory results, which is exact. 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.

Spin-dependent electron-electron interaction in Rashba materials.

Very recently, quantum spin systems have been studied intensively in the context of in-vestigations on their zero-temperature (quantum) phase transitions. In particular, disorder effects arising from quenched randomness are novel phenomena observed in some low-dimensional quantum spin systems. In this thesis, we examine the rich physical properties. Low-dimensional quantum systems Marcin Szyniszewski (Submitted on 17 Oct 2018) We study low-dimensional quantum systems with analytical and computational methods. Firstly, the one-dimensional extended - model of fermions with interactions of a finite range is investigated. The model exhibits a phase transition between liquid and insulating regimes.

Jordan-wigner Fermionization and The Theory of Low-dimensional Quantum.

Here, we report on the direct observation of lattice distortion in the new quasi-one-dimensional spin system TiOBr by X-ray diffraction experiment using synchrotoron radiation. By comparing the crystal structure between TiOBr and TiOCl, the difference in b-axis length was considered to play a key role in determining the physical properties of. In this study, in an integrable quantum system with spin-orbit coupling, we experimentally verified the GETH from the spin relaxation by applying an asymptotic method. Physica E: Low-dimensional systems and nanostructures contains papers and invited review articles on the fundamental and applied aspects of physics in low-dimensional electron systems, in semiconductor heterostructures, oxide interfaces, quantum wells and superlattices, quantum wires and dots, View full aims & scope.

Numerical study of thermal effects in low dimensional quantum spin systems.

A two-dimensional electron gas (2DEG) is a scientific model in solid-state physics. It is an electron gas that is free to move in two dimensions, but tightly confined in the third. This tight confinement leads to quantized energy levels for motion in the third direction, which can then be ignored for most problems. Low-dimensional Quantum Systems. 8-9 Nov 2018 Vandoeuvre les Nancy (France)... Semi-classical perspective on dynamics of correlations in quantum spin models with.

Low-dimensional quantum systems from novel constituents.

The research in low-dimensional (low-D) quantum spin systems has become an arduous challenge for the condensed matter physics community during the last years. In systems with low dimensional magnetic interactions the exchange coupling is restricted to dimensions lower than the full three-D exhibited by the bulk real material. The remarkable. Low Dimensional Semiconductors. The semiconductor based implementation of a solid-state quantum information processing system, where typically the spin configuration of one or a few electrons constitutes a qubit, can be realized through the formation of an array of quantum dots using electrostatic gates over a quantum well created in a semiconductor heterostructure. The question of whether quantum fluctuations are able to eliminate long-range order (LRO) in low-dimensional quantum spin systems with planar symmetry at T equals 0, is studied using a recently developed renormalization-group approach to the investigation of LRO at T equals 0.

PDF Chapter 14 Low-Dimensional Nanostructures - Western Michigan University.

Spin-Peierls transition in low-dimensional quantum spin systems: a Green's function approach. Phys Chem Chem Phys. 2009 Dec 28;11 (48):11415-23. doi: 10.1039/b913654a. Epub 2009 Oct 20. A. A. Zvyagin, Institute for Low Temperature Physics and Engineering, Kharkov, Ukraine. This volume is presented in three parts and it reviews the main features of the theory of one-dimensional quantum insulating magnetic systems. 2010 Hbk ISBN: 978-1-904868-85-9 330pp. Low-dimensional quantum spin systems are the subject of intense theoretical and experimental investigation. From a condensed-matter perspective, not only do these systems provide a natural setting for deepening the exploration of many-body quantum coherence properties as demanded by.