Periodic Reporting for period 3 - ExQuiSid (Extreme Quantum Matter in Solids)
Période du rapport: 2021-06-01 au 2022-11-30
Major highlights include:
• High-precision studies of magnetic anisotropies by means of torque magnetometry and elastic neutron scattering under carefully conceived conditions. This defines the parameter space for studies of transverse-field quantum phase transitions.
• Identification of topologically non-trivial order in the zero-temperature limit and identification of a novel stabilization mechanism. This paves the way to a new class of quantum phase transitions.
• Identification of a new class of coupled elementary excitations (here magneto-elastic). This identifies a new avenue in the pursuit of novel phases near quantum phase transitions.
• Discovery of emergent mesoscale antiferromagnetism at the transverse-field quantum phase transition of an Ising ferromagnet. This identifies a show-case for the formation of textures in a parameter regime dominated by by quantum entanglement.
• Identification of symmetry-enforced topological nodal planes in chiral magnets. This identifies an approach how to readily control topological protectorates of the Fermi surface.
• Identification topological magnons and emergent Landau levels born out of the non-trivial real space topology of a magnetic structure.
• Implementation and commissioning of several new experimental methods: transverse field susceptibility, transverse field calorimetry, neutron-scattering under microwave pumping, and various slow pump-probe techniques, and the commissioning of novel crystal growth apparatus (annealing furnaces for post-growth treatment).
ExQuiSid resolves long-standing mysteries in model-systems of extreme quantum phase transitions, experimentally enables pioneering studies on the creation, nature and classification of non-equilibrium quantum matter in solids at ultra-low energies and temperatures, and experimentally enables pioneering studies of quantum matter driven periodically out of equilibrium in the search for dynamical quantum instabilities and dynamical quantum phases.