Format:
Online-Ressource
ISSN:
1521-3951
Content:
Abstract: The relevance of zero‐energy functions, coming from zero‐energy modes and present in the structure of bosonic Green's functions, is often underestimated. Usually, their values are fixed by assuming the ergodicity of the dynamics, but it can be shown that this is not always correct. As the zero‐energy functions are connected to fundamental response properties of the system under analysis (specific heat, compressibility, susceptibility, etc.), their correct determination is not an irrelevant issue. In this paper we present some results regarding the zero‐energy functions for the Heisenberg chain of spin‐1/2 with periodic boundary conditions as functions of the number of sites, temperature, and magnetic field. Calculations are pursued for finite chains, using equations of motion, exact diagonalization and Lanczos technique, and the extrapolation to the thermodynamic limit is studied.
In:
volume:236
In:
number:2
In:
year:2003
In:
pages:396-399
In:
extent:4
In:
Physica status solidi / B. B, Basic solid state physics, Weinheim : Wiley-VCH, [1971]-, 236, Heft 2 (2003), 396-399 (gesamt 4), 1521-3951
Language:
English
DOI:
10.1002/pssb.200301688
URN:
urn:nbn:de:101:1-2023101307543061033478
URL:
https://doi.org/10.1002/pssb.200301688
URL:
https://nbn-resolving.org/urn:nbn:de:101:1-2023101307543061033478
URL:
https://d-nb.info/1305930908/34
URL:
https://doi.org/10.1002/pssb.200301688
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