The last decade witnessed significant progress in angle-resolved photoemission
spectroscopy (ARPES) and its applications. Today, ARPES experiments with 2-meV energy …

The authors review the results of a wide variety of experiments on materials such as La 2
CuO 4 and Nd 2 CuO 4 that contain weakly coupled CuO 2 layers. These materials are …

NATURE abounds with phase transitions. The boiling and freezing of water are everyday
examples of phase transitions, as are more exotic processes such as superconductivity and …

Quantum materials exhibit a wide array of exotic phenomena and practically useful
properties. A better understanding of these materials can provide deeper insights into …

We report angle resolved photoemission measurements on Sr 2 Cu O 2 Cl 2, an insulating
layered copper oxide. We find that the overall width of the highest occupied band and the …

It is known from the Mermin-Wagner theorem that magnetic long-range order can exist in two
dimensions only at zero temperature, but even then it can still be destroyed eg by quantum …

We have carried out a neutron scattering investigation of the static structure factor S (q 2
D)(q 2 D is the in-plane wave vector) in the two-dimensional spin S= 1/2 square-lattice …

The local spin density approximation plus onsite Coulomb repulsion approach (LSDA+ U) to
density functional theory is carefully reanalyzed. Its possible link to single-particle Green's …

After a mention of the structural, magnetic and electronic properties of high-temperature
superconductors (HTSC), the basic principles of NMR-NQR experiments in these …

The correlation length of the square-lattice spin-1/2 Heisenberg antiferromagnet is studied in
the low-temperature (asymptotic-scaling) regime. Our novel approach combines a very …