article 36 Quantum theory 30 Quantum optics 25 Topology 18 Photons 17 Density functional theory 16 Electronic structure 15 Ground state 15 Dynamics 14 Graphene 14 Quantum entanglement 14 'current 13 Property 13 Hamiltonians 12 Measurements of 12 Binary alloys 11 Calculations 11 Qubits 11 Two-dimensional 11 Bosons 10 Electronic.structure 10 Energy 10 Hermitians 10 Monte Carlo methods 10 Quantum chemistry 10 Atoms 9 Condition 9 Electric fields 9 Entropy 9 Magnetic fields 9