Klaus Kiefer

TL;DR: A long-predicted hidden symmetry in spin ordering has been observed experimentally at temperatures near absolute zero and is in quantitative agreement with the so-called golden ratio predicted for the first two meson particles of the E8 spectrum.

TL;DR: In this article, the authors demonstrated the presence of magnetic monopoles in the spin ice dysprosium titanate (Dy2Ti2O7) by diffuse neutron scattering, which is achieved by applying a symmetry-breaking magnetic field with which they can manipulate the density and orientation of the strings.

TL;DR: It is found that in Cu(4)(OD)(6)Cl(2), where distorted kagome planes are weakly coupled, a dispersionless excitation mode appears in the magnetic excitation spectrum below approximately 20 K, whose characteristics resemble those of quantum spin singlets in a solid state, known as a valence-bond solid that breaks translational symmetry.

TL;DR: Detailed numerical modeling of the ladder specific heat yields excellent quantitative agreement with the experimental data across the entire phase diagram, demonstrating the presence of an extended spin Luttinger-liquid phase between two field-induced quantum critical points and over a broad range of temperature.

TL;DR: By tuning the magnetic field, the fractionalization of magnons into spinons is driven and, in this deconfined regime, both commensurate and incommensurate continua are observed.