Static hole in a critical antiferromagnet: field-theoretic renormalization group
نویسنده
چکیده
Subir Sachdev† Department of Physics, Yale University P.O. Box 208120, New Haven, CT 06520-8120, USA Abstract We consider the quantum field theory of a single, immobile, spin S hole coupled to a twodimensional antiferromagnet at a bulk quantum critical point between phases with and without magnetic long-range order. We present an alternative derivation of its two-loop beta function; the results agree completely with earlier work (M. Vojta et al, Phys. Rev. B 61, 15152 (2000)), and also determine a new anomalous dimension of the hole creation operator.
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