Area B - Quantum Magnetism

Research area B is focused on materials and models of strongly interacting electrons, in particular those with local moments and non-trivial magnetic phenomena, together with their interplay with itinerant charge carriers as well as orbital and lattice degrees of freedom. Area B will tackle the following main goals: the search for and synthesis of novel magnetic quantum materials, the study and control of intertwined electronic orders, in particular in complex oxides and calchogenides, the creation and manipulation of nanostructures of quantum magnets, the investigation of quantum criticality in interacting topological systems beyond the Landau-Ginzburg-Wilson paradigm as well as the detection and classification of interaction-driven topological phases.

Recent Publications

  • 11.11.2019

    Giant enhancement of the skyrmion stability in a chemically strained helimagnet

    We employed small-angle neutron scattering to demonstrate that the magnetic skyrmion lattice can be realized in bulk chiral magnets as a thermodynamically stable state at temperatures much lower than the ordering temperature of the material.

  • 07.11.2019

    Increasing skyrmion stability in ${\mathrm{Cu}}_{2}{\mathrm{OSeO}}_{3}$ by chemical substitution

    The cubic chiral helimagnets with the P213 space group represent a group of compounds in which the stable skyrmion-lattice state is experimentally observed.

  • 31.10.2019

    Mott quantum criticality in the one-band Hubbard model: Dynamical mean-field theory, power-law spect

    Recent studies of electrical transport, both theoretical and experimental, near the bandwidth-tuned Mott metal-insulator transition have uncovered apparent quantum critical scaling of the electrical resistivity at elevated temperatures.

  • 29.10.2019

    Ground state and low-temperature magnetism of the quasi-two-dimensional honeycomb compound ${\mathrm

    We report a combined 115In nuclear quadrupole resonance, 51V nuclear magnetic resonance, and muon spin-relaxation spectroscopic study of the low-temperature magnetic properties of InCu2/3V1/3O3.

  • 15.10.2019

    {Conformality loss and quantum criticality in topological Higgs electrodynamics in 2+1 dimensions

    The electromagnetic response of topological insulators and superconductors is governed by a modified set of Maxwell equations that derive from a topological Chern-Simons (CS) term in the effective Lagrangian with coupling constant kappa.

  • 02.10.2019

    {Orbital magnetic field effects in Mott insulators with strong spin-orbit coupling}

    We study the effect of a magnetic field on the low-energy description of Mott insulators with strong spin-orbit (SO) coupling.

  • 20.09.2019

    {Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co3Sn2S2}

    Bulk-surface correspondence in Weyl semimetals ensures the formation of topological `` Fermi arc'' surface bands whose existence is guaranteed by bulk Weyl nodes.

  • 20.09.2019

    {Magnetic Weyl semimetal phase in a Kagome crystal}

    Weyl semimetals are crystalline solids that host emergent relativistic Weyl fermions and have characteristic surface Fermi-arcs in their electronic structure.

  • 18.09.2019

    {Magnon interactions in the frustrated pyrochlore ferromagnet Yb2Ti2O7}

    The frustrated rare-earth pyrochlore Yb2Ti2O7 is remarkable among magnetic materials: despite a ferromagnetically ordered ground state it exhibits a broad, nearly gapless, continuum of excitations.

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