Infinite-randomness critical point in the itinerant quantum antiferromagnet

Details Infinite-randomness critical point in the itinerant quantum antiferromagnet Infinite-randomness critical point in the itinerant quantum antiferromagnet

2002-06-11

arxiv.org/abs/cond-mat/0206161v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 5 eps figures

Scientific paper

We study the quantum phase transition in the three-dimensional disordered itinerant antiferromagnet by Monte-Carlo simulations of the order-parameter field theory. We find strong evidence for the transition being controlled by an infinite-randomness fixed point: The dynamical scaling is activated, i.e., the logarithm of the energy scales like a power of the length, implying a dynamical exponent of infinity. The probability distribution of the energy gaps is very broad and becomes broader with increasing system size, even on a logarithmic scale.

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