Impurity spin texture at a deconfined quantum critical point

Argha Banerjee, Kedar Damle, and Fabien Alet
Phys. Rev. B 82, 155139 – Published 26 October 2010

Abstract

The spin texture surrounding a nonmagnetic impurity in a quantum antiferromagnet is a sensitive probe of the novel physics of a class of quantum phase transitions between a Néel ordered phase and a valence-bond solid phase in square lattice S=1/2 antiferromagnets. Using a newly developed T=0 quantum Monte Carlo technique, we compute this spin texture at these transitions and find that it does not obey the universal scaling form expected at a scale invariant quantum critical point. We also identify the precise logarithmic form of these scaling violations. Our results are expected to yield important clues regarding the probable theory of these unconventional transitions.

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  • Received 10 February 2010

DOI:https://doi.org/10.1103/PhysRevB.82.155139

©2010 American Physical Society

Authors & Affiliations

Argha Banerjee1, Kedar Damle1, and Fabien Alet2

  • 1Tata Institute of Fundamental Research, 1, Homi Bhabha Road, Mumbai 400005, India
  • 2Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse–UPS–CNRS, F-31062 Toulouse, France

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Issue

Vol. 82, Iss. 15 — 15 October 2010

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