Titlebook: An Introduction to Quantum Spin Systems; John Parkinson,Damian J J Farnell Book 2010 Springer-Verlag Berlin Heidelberg 2010 Theoretical ph

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,Allgemeines über Werkzeugmaschinen,del are studied. The chapter shows how the application of a range of approximate techniques, in addition to the few isolated exact results, can provide a comprehensive and compelling description of the ground-state properties of a wide range of quantum spin systems.

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0075-8450 ions of the Heisenberg and XY models at zero temperature using the Bethe Ansatz and the Jordan-Wigner transformation are covered in some detail. The use of approximat978-3-642-13289-6978-3-642-13290-2Series ISSN 0075-8450 Series E-ISSN 1616-6361

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Numerical Finite-Size Calculations,s of the order of 20 for full diagonalisation and 40 for partial diagonalisation. Clearly the ground state energy and the energies of the elementary excitations are obtained directly. Also the partition function can be constructed directly for full diagonalisation because all the eigenvalues are kno

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Other Approximate Methods,enberg model on the linear chain is used as a test-case for all of these methods. We show that even simple applications of these methods give improved results for the ground-state energy compared to the classical result.

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Quantum Magnetism,del are studied. The chapter shows how the application of a range of approximate techniques, in addition to the few isolated exact results, can provide a comprehensive and compelling description of the ground-state properties of a wide range of quantum spin systems.

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