News & Events
Scientific Highlights
Spectral evidence for Dirac spinons in a kagome lattice antiferromagnet
Emergent quasiparticles with a Dirac dispersion in condensed matter systems can be described by the Dirac equation for relativistic electrons, in analogy with Dirac particles in high-energy physics. For example, electrons with a Dirac dispersion have been intensively studied in electronic systems such as graphene and topological insulators. However, charge is not a prerequisite for Dirac fermions, and the emergence of Dirac fermions without a charge degree of freedom has been theoretically predicted to be realized in Dirac quantum spin liquids. These quasiparticles ...
Electron Glass Phase with Resilient Zhang-Rice Singlets in LiCu3O3
LiCu3O3 is an antiferromagnetic mixed valence cuprate where trilayers of edge-sharing Cu(II)O (3d9) are sandwiched in between planes of Cu(I) (3d10) ions, with Li stochastically substituting Cu(II). Angle-resolved photoemission spectroscopy (ARPES) and density functional theory reveal two insulating electronic subsystems that are segregated in spite of sharing common oxygen atoms: a Cu dz2/O pz derived valence band (VB) dispersing on the Cu(I) plane, and a Cu 3dx2−y2/O 2px,y derived Zhang-Rice singlet (ZRS) band dispersing on the Cu(II)O planes.
Flat-band hybridization between f and d states near the Fermi energy of SmCoIn5
We present high-quality angle-resolved photoemission (ARPES) and density functional theory calculations (DFT+U) of SmCoIn5. We find broad agreement with previously published studies of LaCoIn5 and CeCoIn5, confirming that the Sm 4f electrons are mostly localized. Nevertheless, our model is consistent with an additional delocalized Sm component, stemming from hybridization between the 4f electrons and the metallic bands at “hot spot” positions in the Brillouin zone.
Lab News
Farewell of Agnes Åhl
From October 2023 to March 2024, Agnes Åhl, a SwedNess PhD student in the group of Lennart Bergström at the Stockholm University, absolved her external stay in the Soft Matter Group at LNS.
Congratulations Dr. Boyang Zhou and Dr. Amirreza Hemmatzade!
Recently, Boyang Zhou (left) and Amirreza Hemmatzade (right) have successfully defended their PhD theses conducted at LNS.
LNS at the Highly Frustrated Magnetism conference 2024
Ilaria Villa, PhD student at LNS and LIN, represented our activities at the last conference on Highly Frustrated Magnetism held at the Indian Institute of Technology Madras, in Chennai (7-13 January, 2024). Ilaria received one of the best poster prices.