On Spin 1/2 Excitations and Quantum Criticality in Two Dimensional O(3) Antiferromagnets

We show that despite the absence of a Hopf term and zero Berry phase terms, the N`eel ordered phase of 2+1 D quantum antiferromagnets have spin 1/2 excitations, i.e. spinons. The spinons are skyrmion excitations of a topological nature. Since skyrmion gap is proportional to the spin stiffness, quant...

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Hauptverfasser:	Nazario, Zaira, Santiago, David I
Format:	Artikel
Sprache:	eng
Schlagworte:	Physics - Strongly Correlated Electrons
Online-Zugang:	Volltext bestellen
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