Two-dimensional graphene, carbon nanotubes, and graphene nanoribbons represent a
novel class of low dimensional materials that could serve as building blocks for future …

Antiferromagnetism and superconductivity are both fundamental and common states of
matter. In many strongly correlated systems, including the high-T c cuprates, the heavy …

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 …

抄録 We study the electronic states of graphite ribbons with edges of two typical shapes,
armchair and zigzag, by performing tight binding band calculations, and find that the …

We review the progress in the theory of one-dimensional (ID) Fermi liquids which has
occurred over the past decade. The usual Fermi liquid theory, based on a quasi-particle …

To make the transition from the quasi-long-range order in a chain of antiferromagnetically
coupled S= 1/2 spins to the true long-range order that occurs in a plane, one can assemble …

We have observed superconductivity in the ladder material Sr 0.4 Ca 13.6 Cu 24 O 41.84
under pressures of 3 GPa and 4.5 GPa by means of electrical measurements. The …

Abstract Magnetic properties of Sr Cu 2 O 3 and Sr 2 Cu 3 O 5, containing two-leg and three-
leg S= 1 2 ladders made of antiferromagnetic Cu-O-Cu linear bonds, were investigated. The …

In recent years, the study of ladder materials has developed into a well-established area of
research within the general context of strongly correlated electrons. This effort has been …

We investigate the phase transitions in two-legs ladder systems in the incommensurate
phase, for which the gap is destroyed by a magnetic field (hc 1< h) and the ladder is not yet …