Approximate calculation of the excitation spectrum of the Heisenberg linear chain

Sriram Shastry, B. ; Majumdar, Chanchal K. (1975) Approximate calculation of the excitation spectrum of the Heisenberg linear chain Physical Review B: Condensed Matter and Materials Physics, 12 (7). pp. 2856-2864. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v12/i7/p2856_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.12.2856

Abstract

An approximate calculation of the excitation spectrum of the Heisenberg linear chain is performed by the Green's-function technique. Apart from the usual transverse Green's function, a longitudinal Green's function is also found useful. The decoupling procedure is not based on the two-sublattice picture, but utilizes the knowledge of known exact results about the ground state of the linear chain and the insight obtained from a model with explicitly known ground state. The equations are solved in a self-consistent manner, and the spectrum, except near the edge of the Brillouin zone, compares well the exact des Cloizeaux-Pearson result. We also provide an expression for the intensity for neutron-scattering studies; this can be checked against measurements on CuCl2·2N(C5D5) (CPC).

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:50833
Deposited On:26 Jul 2011 14:04
Last Modified:18 May 2016 04:59

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