Ground state 40 Hamiltonians 6 Excited states 5 Phase diagrams 5 Quantum entanglement 5 Quantum optics 5 Quantum theory 5 Density functional theory 4 Electronic structure 4 Magnetic fields 4 Phase transitions 4 Quantum chemistry 4 Topology 4 Antiferromagnetic materials 3 Binary alloys 3 Calculations 3 Ground state properties 3 Magnetic-field 3 Monte Carlo methods 3 Quantum-phase transition 3 Topological phase 3 Two-dimensional 3 article 3 Anisotropy 2 Antiferromagnetism 2 Atoms 2 Bosons 2 Chemical analysis 2 Computation theory 2 Coulomb interactions 2