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.

Professor Phil Woodruff has been awarded the IUVSTA Prize for Science 2019.

The prize was awarded for "outstanding contributions to deepening our understanding of the structure of surface through the development and application of broadly applicable tools now widely available to the surface science community".

The IUVSTA Prize for Science is given every three years to recognize and encourage outstanding internationally acclaimed experimental and/or theoretical research in the fields of interest to the International Union for Vacuum Science, Technique and Applications (IUVSTA). The prize will be presented at their flagship conference, the International Vacuum Congress (IVC-21) in Malmö, Sweden July 1-5, 2019, where Phil will give a plenary lecture.

A fragment of a planet that has survived the death of its star has been discovered by astronomers in a disc of debris formed from destroyed planets, which the star ultimately consumes.

The discovery, reported in the journal Science, is the first time that scientists have used spectroscopy to discover a solid body in orbit around a white dwarf, using subtle variations in the emitted light to identify additional gas that the planetesimal is generating.