The 'topological' charge for the finite XX quantum chain

Authors
Bilstein, U Rittenberg, V
Citation
U. Bilstein et V. Rittenberg, The 'topological' charge for the finite XX quantum chain, J PHYS A, 33(42), 2000, pp. L381-L385
Citations number
13
Categorie Soggetti
Physics
Journal title
JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
ISSN journal
03054470 → ACNP
Volume
33
Issue
42
Year of publication
2000
Pages
L381 - L385
Database
ISI
SICI code
0305-4470(20001027)33:42<L381:T'CFTF>2.0.ZU;2-#
Abstract
It is shown that an operator (in general non-local) commutes with the Hamil tonian describing the finite XX quantum chain with certain non-diagonal bou ndary terms. In the infinite-volume limit this operator gives the 'topologi cal' charge.