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On the motion of an extra electron in an antiferromagnetic CuO2 layer

✍ Scribed by F. Richer; J. Appel; P. Hertel

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
308 KB
Volume
172
Category
Article
ISSN
0921-4534

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✦ Synopsis

A model is developed for the motion of an electron in a 2d-quantumantiferromagnet (QAFM). The Hamiltonian for the layer consists of two parts: The H,_rHamiltonian for nearest neighbours and the 3-site term. From the layer we derive by ejection of a single extra hole an effective Hamiltonian.

The itinerant motion of the extra charge carrier caused by the 3-site term is given by the dispersion relation of the form E(k) z (J/2) [ (cos k, +cos k,)*-11.

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In der Einleitung wird gezeigt dass in einer Hochvakuum-Elektronen-r6hre, bes~ehend aus Kathode, zwei Gittern und Anode, durch Anlegen " geeigneter Gleich-und Wechselspannungen hoher Frequenz erreicht werden kann, dass einige Elektronen eine gr6ssere kinetische Energie erhalten als mit dem Augenblic