Academic literature on the topic 'HEISENBERG MODEL; SPIN'

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Journal articles on the topic "HEISENBERG MODEL; SPIN"

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FARACH, H. A., R. J. CRESWICK, and C. P. POOLE. "THE RESTRICTED SPIN MODEL." Modern Physics Letters B 04, no. 16 (1990): 1029–41. http://dx.doi.org/10.1142/s0217984990001306.

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We present a novel anisotropic Heisenberg model in which the classical spin is restricted to a region of the unit sphere which depends on the value of the anisotropy parameter Δ. In the limit Δ→1, we recover the Ising model, and in the limit Δ→0, the isotopic Heisenberg model. Monte Carlo calculations are used to compare the critical temperature as a function of the anisotropy parameter for the restricted and unrestricted models, and finite-size scaling analysis leads to the conclusion that for all Δ>0 the model belongs to the Ising universality class. For small A the critical behavior is c
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SZETO, K. Y. "HIGH TEMPERATURE SERIES ANALYSIS OF SUSCEPTIBILITY DATA OF La2CuO4." Modern Physics Letters B 04, no. 04 (1990): 283–87. http://dx.doi.org/10.1142/s0217984990000350.

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The zero-field magnetic susceptibility of La 2 CuO 4 is analyzed using high temperature series for five different magnetic Hamiltonians in two-dimensions: spin 1/2 Heisenberg model, spin 1/2 XY model, classical Heisenberg model, classical XY model, and the Ising model. The goodness of fit indicates that the quantum spin 1/2 Heisenberg model is best, with the classical XY model second.
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Afremov, Leonid L., and Aleksandr A. Petrov. "“Average Spin” Approximation in the Heisenberg Model." Applied Mechanics and Materials 752-753 (April 2015): 243–46. http://dx.doi.org/10.4028/www.scientific.net/amm.752-753.243.

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The “average spin” method was developed in terms of Heisenberg model. The average magnetic moment’s depending average of the temperature, the number of the nearest neighbors and spin of the atom has been calculated. It’s shown that the Curie temperature decreases with the spin of the atom.
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ITO, NOBUYASU, and MASUO SUZUKI. "COHERENT-ANOMALY METHOD FOR QUANTUM SPIN SYSTEMS." International Journal of Modern Physics B 02, no. 01 (1988): 1–11. http://dx.doi.org/10.1142/s0217979288000020.

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The coherent-anomaly method (CAM) is applied to the Heisenberg model to test the applicability of the CAM for quantum spin systems. The Weiss, Bethe and constant coupling approximations are tried for the Heisenberg model on the simple cubic lattice and estimate the critical exponents of the susceptibility and spontaneous magnetization using the CAM. The results show that the CAM is also powerful for quantum spin systems. The detailed results of the Bethe approximation of the spin-1/2 isotropic Heisenberg model are presented.
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Felcy, A. Ludvin, and M. M. Latha. "A spin rotator model for Heisenberg helimagnet." Physica A: Statistical Mechanics and its Applications 491 (February 2018): 1–12. http://dx.doi.org/10.1016/j.physa.2017.08.059.

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ANGELUCCI, ANTIMO. "ORDER PARAMETERS OF FRUSTRATED SPIN SYSTEMS." International Journal of Modern Physics B 05, no. 04 (1991): 659–74. http://dx.doi.org/10.1142/s0217979291000365.

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We present a study of the ground states and of the low energy fluctuations of the frustrated Heisenberg spin chain, both classical and quantum. Analyzing this simple model we draw some general conclusions about the antiferro-helix “transition” of general classical Heisenberg models. We derive the low energy action describing the fluctuations about the helical phases and we infer the possible existence of nontrivial topological terms in the quantum counterparts.
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YANG, J., W. P. SU, and C. S. TING. "MODIFIED SCHWINGER BOSON THEORY OF QUANTUM HEISENBERG MODEL." Modern Physics Letters B 05, no. 24n25 (1991): 1695–701. http://dx.doi.org/10.1142/s0217984991002045.

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We proposed a modified Schwinger boson theory for quantum Heisenberg model which naturally satisfies the spin identity [Formula: see text], and in which the redundant degrees of freedom due to an average treatment of the constraints are discarded by introducing new boson operators. The results, either for free energy or for spin-spin correlation are exactly the same as those of Takahashi’s modified spin wave theory.7 This theory provides a unified approach to study the ferromagnet and antiferromagnet on equal footing. As such it would be a good starting point for discussing antiferromagnetism
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Ng, K. K. "Bilayered Spin-S Heisenberg Model in Fractional Dimensions." International Journal of Modern Physics B 12, no. 18 (1998): 1809–12. http://dx.doi.org/10.1142/s0217979298001034.

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The ground state and the phase transitions of the bilayered spin-S anti-ferromagnetic Heisenberg model were studied by Ng et al.1 by using the Schwinger boson mean field theory. In this paper, an analytic continuation of the self-consistent equations is carried out in order to study the extension of the model to fractional dimensions from 1 to 2. Decreasing the dimensionality from 2 has an effect similar to that of decreasing the spin S. The corresponding phase diagram and phase transition will also be discussed.
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BELINICHER, V. I., and L. V. POPOVICH. "QUARTET STATE OF THE TWO-DIMENSIONAL HEISENBERG MODEL WITH THE SPIN-½ ON A SQUARE LATTICE." International Journal of Modern Physics B 08, no. 16 (1994): 2203–19. http://dx.doi.org/10.1142/s0217979294000890.

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The low-energy properties of the two-dimensional Heisenberg model with spin-½ on a square lattice are investigated on the basis of the local dimer order. The lattice is divided into square blocks consisting of the quartets of spins. The spin variables and the Heisenberg Hamiltonian are expressed in terms of the low-energy quartet variables. On the basis of the Dyson-Maleev representation, the spin-wave theory of the quartet state is developed. The spectrum of the lower magnon excitations consists of three degenerate modes with the energy gap Δ=0.17J. The ground state energy per spin E/N=−0.6J.
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Prata, G. N., P. H. Penteado, F. C. Souza, and Valter L. Líbero. "Spin-density functional for exchange anisotropic Heisenberg model." Physica B: Condensed Matter 404, no. 19 (2009): 3151–54. http://dx.doi.org/10.1016/j.physb.2009.07.066.

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Dissertations / Theses on the topic "HEISENBERG MODEL; SPIN"

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Lozano, Dairon Andrés Jiménez. "Modelo de Heisenberg Antiferromagnético de spin-1/2 na rede triangular com interações competitivas." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-21092016-212043/.

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Nesta dissertação estudamos sistemas de spins em redes de baixa dimensionalidade e em temperatura nula, analisando suas transições de fases quânticas. Mais precisamente, estu- damos as propriedades do estado fundamental e as possíveis transições de fase do modelo de Heisenberg quântico antiferromagnético de spin-1/2, com interações entre os primeiros e segundos vizinhos, em diversas redes, e em particular na rede triangular, que é o foco de nosso estudo. Para a obtenção do estado fundamental aproximado, usamos um método variacional em que a rede é particionada num conjunto de plaquetas de síti
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Fong, Manson Cheuk-Man. "Heisenberg model with spin anisotropy on the Kagomé lattice /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202008%20ZFONG.

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Rowan, David Glenn. "Theoretical studies of disordered short-range spin models." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299226.

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Szàllàs, Attila. "Heisenberg antiferromagnetic model on 2D quasiperiodic tilings." Paris 11, 2008. http://www.theses.fr/2008PA112174.

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Le pavage de Penrose est une structure quasipériodique bidimensionnelle, utilisée dans la description des composés quasicristallins. Cette structure est parfaitement ordonnée, avec une symétrie de rotation cinq et elle est invariante sous un changement d'échelle par un facteur τ. Nous avons étudié les propriétés d'un modèle d'Heisenberg sur le pavage de Penrose construit à partir de losanges, en utilisant une méthode de développement en ondes de spin. Les énergies et fonctions d'ondes des magnons (quantum d'une onde des spins) ont été étudiées dans le cadre d'une théorie linéarisée. Les propri
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Oliveira, Ravenna Rodrigues. "Modelo de Heisenberg para cadeia de spins." reponame:Repositório Institucional da UFC, 2016. http://www.repositorio.ufc.br/handle/riufc/19729.

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OLIVEIRA, R. R. Modelo de Heisenberg para cadeia de spins. 2016. 58 f. Dissertação (Mestrado em Física) – Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2016.<br>Submitted by Giordana Silva (giordana.nascimento@gmail.com) on 2016-09-26T18:55:18Z No. of bitstreams: 1 2016_dis_rroliveira.pdf: 2847981 bytes, checksum: edaf4ac09f696a3c00730658e00f0e9c (MD5)<br>Approved for entry into archive by Giordana Silva (giordana.nascimento@gmail.com) on 2016-09-26T18:55:56Z (GMT) No. of bitstreams: 1 2016_dis_rroliveira.pdf: 2847981 bytes, checksum: edaf4ac09f696a3c00730658e00f0e9c (MD5)<br>M
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Silva, Wanêssa Façanha da. "Ondas de spin em redes decoradas." reponame:Repositório Institucional da UFC, 2014. http://www.repositorio.ufc.br/handle/riufc/13700.

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SILVA, Wanêssa Façanha. Ondas de spin em redes decoradas. 2014. 62 f. Dissertação (Mestrado em Física) - Programa de Pós-Graduação em Física, Departamento de Física, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2014.<br>Submitted by Edvander Pires (edvanderpires@gmail.com) on 2015-10-22T20:40:26Z No. of bitstreams: 1 2014_dis_wfsilva.pdf: 5621741 bytes, checksum: 74eb09424ba24b6a3b1acd4b7df5dee6 (MD5)<br>Approved for entry into archive by Edvander Pires(edvanderpires@gmail.com) on 2015-10-22T20:40:38Z (GMT) No. of bitstreams: 1 2014_dis_wfsilva.pdf: 5621741 bytes, checksum: 74
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Souza, Fabiano Caetano de. "Método de diagonalização iterativa para o modelo de Heisenberg." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-13092010-103541/.

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Nesta tese desenvolvemos um método numérico para diagonalizar o Hamiltoniano de Heisenberg iterativamente. O método consiste basicamente em diagonalizar cadeias de spins, cada vez maiores, em que cada passo da diagonalização corresponde à adição de um novo spin à cadeia. A base de vetores para calcular o Hamiltoniano de uma cadeia de N spins, HN, é construída por meio do produto direto dos autovetores do Hamiltoniano Hn-1 da rede diagonalizada no passo anterior, pelos autoestados correspondentes ao N-ésimo spin adicionado. Além de usar a comutação do Hamiltoniano com a componente azimutal do s
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Silva, WanÃssa FaÃanha da. "Ondas de spin em redes decoradas." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12439.

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Sistema de baixa dimensionalidade tÃm atraÃdo uma grande atenÃÃo ultimamente devido a sistemas como grafeno e nanotubos de carbono. Tais sistemas tÃm grandes possibilidades de aplicaÃÃes tecnolÃgicas, em particular na criaÃÃo de dispositivos eletrÃnicos, devido Ãs suas propriedades eletrÃnicas especÃficas. Nesse sentido, o estudos de outros sistemas em baixa dimensÃo se torna urgente. Mais especificamente, o estudo de propriedades magnÃticas de materiais de materiais em baixa dimensionalidade tambÃm trÃs grandes novidades no comportamento de sistemas ferromagnÃticos. O comportamento de ondas d
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Exler, Matthias. "On classical and quantum mechanical energy spectra of finite Heisenberg spin systems." Doctoral thesis, [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980110440.

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Szallas, Attila. "Heisenberg antiferromagnetique model sur le pavage quasicrystaux bidimensionnelle." Phd thesis, Université Paris Sud - Paris XI, 2008. http://tel.archives-ouvertes.fr/tel-00358251.

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Le pavage de Penrose est une structure quasipériodique bidimensionnelle, utilisée dans la description des composés quasicristallins. Cette structure est parfaitement ordonnée, avec une symétrie de rotation cinq et elle est invariante sous un changement d'échelle par un facteur $\tau$ (le nombre d'or). On s'attend à ce que les propriétés d'un modèle d'antiferromagnétisme dans un tel système diffèrent nettement de celles des antiferromagnétiques périodiques. Nous avons étudié les propriétés d'un modèle d'Heisenberg sur le pavage de Penrose construit à partir de losanges, en utilisant une méthode
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Books on the topic "HEISENBERG MODEL; SPIN"

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Sricheewin, Chanun. The coupled-cluster method treatment of spin-1/2 Heisenberg 2-leg ladder model. UMIST, 1998.

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Boudreau, Joseph F., and Eric S. Swanson. Quantum spin systems. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198708636.003.0022.

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The quantum mechanical underpinnings of magnetism are explored via the Heisenberg model of antiferromagnetism. The Lanczos algorithm is developed and applied to obtain ground state properties of the anisotropic antiferromagnetic Heisenberg spin chain. In particular, the phase diagram for the system magnetization is determined. A quantum Monte Carlo method that is appropriate for discrete systems is also presented. The method leverages the similarity between the Schrödinger equation and the diffusion equation to compute energy levels. The formalism necessary to compute ground state matrix eleme
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Eriksson, Olle, Anders Bergman, Lars Bergqvist, and Johan Hellsvik. The Atomistic Spin Dynamics Equation of Motion. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198788669.003.0004.

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From the information obtained in DFT, in particular the magnetic moments and the Heisenberg exchange parameters, one has the possibility to make a connection to atomistic spin-dynamics. In this chapter the essential features of this connection is described. It is also discussed under what length and time-scales that this approach is a relevant approximation. The master equation of atomistic spin-dynamics is derived, and discussed in detail. In addition we give examples of how this equation describes the magnetization dynamics of a few model systems.
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W, Lovesey S., Rutherford Appleton Laboratory, and Council For The Central Laboratory of The Research Councils., eds. A theory of spin correlations and neutron scattering from paramagnetic materials based on the Ising-Heisenberg model in one, two and three space dimensions. Rutherford Appleton Laboratory, 1996.

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Eckle, Hans-Peter. Models of Quantum Matter. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780199678839.001.0001.

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This book focuses on the theory of quantum matter, strongly interacting systems of quantum many–particle physics, particularly on their study using exactly solvable and quantum integrable models with Bethe ansatz methods. Part 1 explores the fundamental methods of statistical physics and quantum many–particle physics required for an understanding of quantum matter. It also presents a selection of the most important model systems to describe quantum matter ranging from the Hubbard model of condensed matter physics to the Rabi model of quantum optics. The remaining five parts of the book examine
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Book chapters on the topic "HEISENBERG MODEL; SPIN"

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Wysin, G. M., M. E. Gouvea, A. R. Bishop, and F. G. Mertens. "Classical Spin Dynamics in the Two-Dimensional Anisotropic Heisenberg Model." In Springer Proceedings in Physics. Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-93400-1_5.

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Muminov, Kh Kh, and Valirii K. Fedyanin. "Nonlinear Spin Waves and Magnet-Acoustic Resonance in the Model of Heisenberg Magnet." In Mathematical Models of Non-Linear Excitations, Transfer, Dynamics, and Control in Condensed Systems and Other Media. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4799-0_18.

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Sisson, C. J., and R. J. Creswick. "Decoupled-Cell Monte-Carlo Calculations of Critical Properties of the Spin-1/2 Heisenberg Model." In Springer Proceedings in Physics. Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78448-4_26.

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Gutkin, Eugene. "Heisenberg—Ising Spin Chain: Plancherel Decomposition and Chebyshev Polynomials." In Calogero—Moser— Sutherland Models. Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1206-5_12.

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Porsezian, K. "On the Discrete and Continuum Integrable Heisenberg Spin Chain Models." In NATO ASI Series. Springer US, 1993. http://dx.doi.org/10.1007/978-1-4899-1609-9_42.

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Matsubara, F., T. Iyota, and S. Inawashiro. "A Hybrid Monte-Carlo Spin-Dynamics Method and Its Applications to the ±J Heisenberg Models in Three Dimensions." In Springer Proceedings in Physics. Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84821-6_40.

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Pires, Antonio Sergio Teixeira. "The Heisenberg model." In Theoretical Tools for Spin Models in Magnetic Systems. IOP Publishing, 2021. http://dx.doi.org/10.1088/978-0-7503-3879-0ch1.

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Eckle, Hans-Peter. "The Anisotropic Heisenberg Quantum Spin Chain." In Models of Quantum Matter. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780199678839.003.0013.

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This chapter introduces the Heisenberg model, a fully quantum mechanical model that describes the magnetism of localized magnetic moments. The one-dimensional version of the Heisenberg model, the Heisenberg quantum spin chain, provides a good picture of magnetic materials that belong to a class of insulating magnetic materials where the interaction of the magnetic moments in one particular direction is much larger than in the perpendicular directions, and which can be described with high accuracy as quasi- one-dimensional magnets. A detailed description of the Heisenberg quantum spin chain is followed by a discussion of its various special cases, in particular the special case of the anisotropic Heisenberg quantum spin chain, the so-called XXZ quantum spin chain. It considers the solution of eigenvalue problem of this quantum spin and leads to Bethe’s conjecture for the wave function.
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Eckle, Hans-Peter. "Thermodynamics of the Isotropic Heisenberg Quantum Spin Chain." In Models of Quantum Matter. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780199678839.003.0018.

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This chapter presents the extension of the Bethe ansatz to finite temperature, the thermodynamic Bethe ansatz, for the antiferromagnetic isotropic Heisenberg quantum spin chain, the XXX quantum spin chain. It discusses how the added complications of this model arise from the more complicated structure of excitations of the quantum spin chain, the complex string excitations, which have to be included in the Bethe ansatz thermodynamics. It derives the integral equations of the thermodynamic Bethe ansatz for the XXX quantum spin chain and mentions explicit formulas for the free energy of the quantum spin chain and some interesting physical quantities, especially making contact with predictions of conformal symmetry.
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Eckle, Hans-Peter. "Six-Vertex Model." In Models of Quantum Matter. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780199678839.003.0011.

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This chapter considers the special case of the six-vertex model on a square lattice using a trigonometric parameterization of the vertex weights. It demonstrates how, by exploiting the Yang-Baxter relations, the six-vertex model is diagonalized and the Bethe ansatz equations are derived. The Hamiltonian of the Heisenberg quantum spin chain is obtained from the transfer matrix for a special value of the spectral parameter together with an infinite set of further conserved quantum operators. By the diagonalization of the transfer matrix the exact solution of the one-dimensional quantum spin chain Hamiltonian has automatically also been obtained, which is given by the same Bethe ansatz equations.
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Conference papers on the topic "HEISENBERG MODEL; SPIN"

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Misumi, K., K. Seki, and Y. Ohta. "Spin Excitations in the Square-Lattice Heisenberg Model with Ring-Exchange Interactions." In Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013). Journal of the Physical Society of Japan, 2014. http://dx.doi.org/10.7566/jpscp.3.014021.

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Tanamoto, T., K. Ono, Y. X. Liu, and F. Nori. "Dynamic creation of a topologically-ordered Hamiltonian using spin-pulse control in the Heisenberg model." In 2015 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2015. http://dx.doi.org/10.7567/ssdm.2015.h-7-2.

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Si LAKHAL, B., and A. ABADA. "FOUR-SPINON CONTRIBUTION TO THE DYNAMIC STRUCTURE FACTOR IN THE ANTIFERROMAGNETIC HEISENBERG MODEL." In Proceedings of the 16th International Spin Physics Symposium and Workshop on Polarized Electron Sources and Polarimeters. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701909_0099.

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Strečka, Jozef, Lucia Čanová, Kazuhiko Minami, et al. "Weak-universal critical behavior and quantum critical point of the exactly soluble spin-1∕2 Ising-Heisenberg model with the pair XYZ Heisenberg and quartic Ising interactions." In STATISTICAL PHYSICS: MODERN TRENDS AND APPLICATIONS: The 3rd Conference on Statistical Physics Dedicated to the 100th Anniversary of Mykola Bogolyubov. AIP, 2009. http://dx.doi.org/10.1063/1.3284411.

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BISHOP, R. F., P. H. Y. LI, R. DARRADI, and J. RICHTER. "THE SPIN-1/2 AND SPIN-1 QUANTUM J1−J′1−J2 HEISENBERG MODELS ON THE SQUARE LATTICE." In Proceedings of the 14th International Conference. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812779885_0034.

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