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|Type:||Artigo de periódico|
|Title:||Lanczos Calculation For The S=1/2 Antiferromagnetic Heisenberg Chain Up To N=28 Spins|
|Abstract:||Highly precise numerical calculations using a variation of the Lanczos method devised by Paige were performed for s=1/2 antiferromagnetic Heisenberg finite chains up to sizes N=28. Several interesting physical quantities, including the ground-state energy, the mass gap, and the spin-wave velocity, were computed and fitted for logarithmic finite-size corrections, as suggested by conformal invariance and Bethe ansatz calculations. A crossover size for a maximum of the spin-wave velocity is predicted for N50, well above the current available sizes in a typical Lanczos simulation. A list of our numerical results is given along with extrapolated values using standard algorithms. © 1991 The American Physical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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