Exotic phases of matter in quantum magnets

Exotic phases of matter in quantum magnets

Ultracold atoms in an optical lattice: One-dimensional phase diagram

Ground-state phase diagram of the spin-1/2 ferromagnetic-antiferromagnetic alternating Heisenberg chain with anisotropy.

The ground state of the ferromagnetic-antiferromagnetic alternating spin-t Heisenberg chain is stud­ ied with Ising-type anisotropy on the ferromagnetic bond. This model tends to the spin-l antiferromag­ netic Heisenberg chain with on-site anisotropy in the limit of strong ferromagnetic bond. It is found that the Halda...

Thermally melted quadrupolar order and intrinsically quantum phases in 5$d^1$ double perovskites

Spin-orbit-coupled $d^1$ double perovskites exhibit a rich interplay of spin, orbital, and quadrupolar degrees of freedom (DOF), giving rise to competing magnetic and multipolar phases. Although quantum mean-field theories predict many exotic phases, their stability against thermal fluctuations and reproducibility with...

Symmetry-resolved quasilocal entanglement as a key to Mott and pseudogap physics in plaquette CDMFT

In order to identify intrinsic quantum resources in strongly interacting fermionic systems, we introduce a symmetry resolution of the parity-superselected two-site entanglement, as measured by both the fermionic negativity and the relative entropy of entanglement. We discuss how the symmetry resolution can be extended...

Spin-1/2 Heisenberg diamond-like decorated honeycomb lattice in a magnetic field from the perspective of localized magnons and exact diagonalization

The spin-$1/2$ quantum Heisenberg model on the diamond-decorated honeycomb lattice in a magnetic field is investigated using complementary analytical and numerical methods. The ground-state phase diagram comprises Lieb-Mattis ferrimagnetic, dimer-tetramer, monomer-dimer, spin-canted, and saturated paramagnetic phases,...