天美传媒

A study of chiral liquid-crystal droplets shows how defects lead to geometric arrangements similar to atoms in a molecule, and provides a new framework for analysing novel chiral materials.

We investigate a simple tight-binding Hamiltonian to understand the stability of spin-polarized transport of states with an arbitrary spin content in the presence of disorder. The general spin state is made to pass through a linear chain of magnetic atoms, and the localization lengths are computed. Depending on the value of spin, the chain of magnetic atoms unravels a hidden transverse dimensionality that can be exploited to engineer energy regimes where only a selected spin state is allowed to retain large localization lengths. Our results show that the spin filtering effect is robust against weak disorder and hence the proposed system should be a good candidate model for experimental realizations of spin-selective transport devices.

Room-temperature spin transport has now been shown in both pivotal semiconductor materials, Ge and Si, providing new opportunities for the future of semiconductor spintronics.

Discovery of Fractional Quantum Hall Effect in a strained Germanium semiconductor indicates superior quality of epitaxial material and offers the simplest system to research quantum physics.