Abstract
For a number of quantum critical points in one dimension quantum field theory has provided exact results for the scaling of spatial and temporal correlation functions. Experimental realizations of these models can be found in certain quasi one dimensional antiferromagnetic materials. Measuring the predicted scaling laws experimentally presents formidable technical challenges. In many cases it only became possible recently, thanks to qualitative progress in the development of inelastic neutron scattering techniques and to the discovery of new model compounds. Here we review some of the recent experimental studies of this type.
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Notes
An important and common case of zν ≡ 1 is when the Zeeman term commutes with the rest of the Hamiltonian [50], as, for example, in the Heisenberg model.
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ACKNOWLEDGMENTS
Most of the new experimental material reviewed here was supported by the Swiss National Science Foundation, Division 2, and is the subject of successfully defended PhD dissertations at ETH Zurich, namely those of Dr. David Schmidiger [41], Dr. Manuel Haelg [32], Dr. Gediminas Simutis [29] and Dr. Dominic Blosser [52]. K. Povarov, S. Gvasaliya, W. Lorentz and D. Huevonen (ETH Zurich) also played an important role in many of the measurements. Which, in turn, would be impossible without the expert support of instrument scientists at neutron scattering user facilities: T. Perring, D. Voneshen, R. Bewley, H.C. Walker, D.T. Adjora, F. Demmel and T. Guidi (Rutherford Appleton Laboratory, UK); J. Robert and S. Petit (Laboratoire Leon Brillouin, CEA-CNRS, Saclay, France); M. Stone, A.I. Kolesnikov and A.T. Savichi (Oak Ridge National Laboratory, USA); L.P. Regnault and F. Bourdarot (CEA Grenoble, France); O. Sobolev (Forschungsneutronenquelle Heinz Maier-Leibnitz, Munich, Germany); N.P. Butch (National Institute of Standards and Technology, USA); D.L. Quintero-Castro (Helmholtz-Zentrum Berlin, Germany); A. Piovano and M. Boehm (Institut Laue-Langevin, Grenoble, France). While most samples for the described experiments were grown at ETH Zürich, the linear-chain cuprate crystals originate from the laboratories of Prof. B. Buechner (IFW Dresden, Germany), Prof. T. Masuda (The University of Tokyo, Japan) and Prof. A. Revcolevschi (Universite Paris-Sud, Orsay, France).
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Zheludev, A. Quantum Critical Dynamics and Scaling in One-Dimensional Antiferromagnets. J. Exp. Theor. Phys. 131, 34–45 (2020). https://doi.org/10.1134/S1063776120070183
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DOI: https://doi.org/10.1134/S1063776120070183