Conference Presentations

Based on my experience as developer and maintainer of some numerical open-source libraries (libcerf, libkww, libformfactor), I will explain key concepts for writing code that computes a special function or integral with high accuracy and high speed.- Choose different numerical algorithms for different argument regions.- Don't be afraid of divergent series or ill-conditioned recursions. - Confine Chebyshev fits to small subregions. [...]

Pt/Co/Pt and Pd/Co/Pd heterostructures with perpendicular magnetic anisotropy (PMA) are traditionally used for magnetic recording. PMA can be tuned by e.g [...]

Unravelling emergent excitations and exotic quasiparticles in frustrated and topological quantum magnets represents a tremendous challenge experimentally, since the relevant inelastic scattering signals are very weak, often very broad in Q-space, and may be highly anisotropic in spin-space or strongly bond-direction dependent. A dedicated cold-neutron TOF spectrometer that combines with a new-generation wide-angle polarisation analysis (WAPA) can meet this challenge. [...]

The science community faces a challenging situation to maintain sustainable research with neutron methods at the moment. While neutron scattering is an indispensable microscopic probe for the investigations of magnetic order and spin excitations, there are complementary techniques at the large-scale facilities that are also suitable for magnetism research, such as element-specific magnetic resonant X-ray scattering at the synchrotron radiation facilities, and muon spectroscopy at the muon facilities. [...]

Magnetic topological quantum materials, such as magnetic Dirac and Weyl semimetals, andintrinsic magnetic topological insulators, in which topologically non-trivial band structures,magnetism and electronic correlation effects can be intertwined, have recently emerged as anexciting platform to explore exotic states and novel functionalities. As a unique microscopicprobe for magnetism, neutron scattering is ideally suited for the investigations of magneticcorrelations over a wide range of length and time scales in these novel quantum materials. [...]

Magnetic topological kagome metals, in which topologically non-trivial band structures, magnetism and electronic correlation effects can often be intertwined, have recently emerged as an exciting platform to explore exotic states and novel functionalities. In this talk, I will mainly present our recent single-crystal neutron diffraction studies of complex magnetic orders in several archetypical magnetic kagome metals, including the realization of flat-band engineered spin-density wave in the magnetic Weyl semimetal Mn$_3$Sn [1], as well as the observations of various field-induced magnetic phases that give rise to the emergent topological Hall effect in the magnetic kagome metal RMn$_6$Sn$_6$ [2].We thank Xiao Wang, Fengfeng Zhu, Yishui Zhou as well as many other co-workers and collaborators for their contributions.[1] X. [...]

Following the discovery of a quantum-limit magnetic Chern phase in TbMn6Sn6 and the observations of a large topological Hall effect (THE) in the various field-induced magnetic phases in YMn6Sn6 etc., the magnetic topological metals RMn6Sn6 (R = rare earth), that possess a bilayer kagome lattice of Mn, have recently emerged as a new platform to explore exotic quantum states that arise from the interplay between magnetism and non-trivial topological states in both k-space and real space. Understanding and eventual manipulation of these exotic quantum states can lead to potential technological applications in spintronics and quantum technologies. [...]