Impurity spin texture at a deconfined quantum critical point

Argha Banerjee , Kedar Damle , Fabien Alet (1, 2)

1 FFC - Fermions Fortement Corrélés (LPT)
2 LPT - Laboratoire de Physique Théorique

The spin texture surrounding a non-magnetic impurity in a quantum antiferromagnet is a sensitive probe of the novel physics of a class of quantum phase transitions between a Neel 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.

Domaines: Autre [cond-mat.other]

Argha Banerjee, Kedar Damle, Fabien Alet. Impurity spin texture at a deconfined quantum critical point. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2010, 82, pp.155139. ⟨10.1103/PhysRevB.82.155139⟩. ⟨hal-00531817⟩