Solid state physics: Magnetic interactions in quasi-two-dimensional systems

Two Dimensional Systems in Solid State and Surface Physics: Strong Electric and Magnetic Fields Effects

Two-dimensional condensed matter systems provide a fertile ground for the study of strong magnetic and electric field effects. We review the present status of studies in three such systems the electron space-charge layer at the semiconductor surface in a metaloxide-semiconductor (MOS) system, in heterojunction superlattices, and at the surface of liquid helium. In addition, we present the resul...

Ground-state properties and superfluidity of two- and quasi-two-dimensional solid 4He.

In a recent study we have reported a new type of trial wavefunction symmetric under the exchange of particles, which is able to describe a supersolid phase. In this work, we use the diffusion Monte Carlo method and this model wavefunction to study the properties of solid (4)He in two- and quasi-two-dimensional geometries. In the purely two-dimensional (2D) case, we obtain results for the total ...

Effective mass in quasi two-dimensional systems

– The effective mass of the quasiparticle excitations in quasi two-dimensional systems is calculated analytically. It is shown that the effective mass increases sharply when the density approaches the critical one of metal-insulator transition. This suggests a Mott-type of transition rather than an Anderson-like transition. The experimental measurements can be reproduced in this way without any...

Two-dimensional magnetic interactions in LaFeAsO

Pectin-cellulose interactions in the Arabidopsis primary cell wall from two-dimensional magic-angle-spinning solid-state nuclear magnetic resonance.

The primary cell wall of higher plants consists of a mixture of polysaccharides whose spatial proximities and interactions with each other are not well understood. We recently obtained the first two-dimensional (2D) and three-dimensional high-resolution magic-angle-spinning (13)C solid-state nuclear magnetic resonance spectra of the uniformly (13)C-labeled primary cell wall of Arabidopsis thali...