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ALS Work Using ARPES

Angle-resolved photoemission spectroscopy (ARPES) is a technique in which a highly focused beam of x-rays is used to kick electrons out of the sample. By analyzing the ejected electrons' direction and energy, the researchers can obtain the material's band structure—a map of the electrons' behavior in the material.

 

A Novel Quasi-1D Topological Insulator

The tantalizing prospect of energy-saving, ultralow-power electronics has led to a vigorous search for optimal topological insulator materials. Now, an international team of scientists has discovered the first of a new class of topological insulators with unique properties: quasi-1D bismuth iodide. Read more »

A New Universal Parameter for Superconductivity

Scientists have been researching high-temperature (high-Tc) superconductors for decades with the goal of finding materials that express superconducting capabilities at room temperature, which would be a requirement for practical and cost-effective applications. The newest materials to gain scientific interest are iron-based superconductors, and the latest research from the ALS on these materials indicates a new factor that determines their superconductivity. Read more »PPT-icon-35 PDF-icon-35

Weyl Fermions Discovered After 85 Years

Weyl fermions, elusive massless particles first theorized 85 years ago, have now been detected as emergent quasiparticles in synthetic crystals of the semimetal TaAs. The discovery could allow for the nearly free and efficient flow of electricity, as well as the realization of many fascinating topological quantum phenomena.

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ALS Director’s Update: Reflections on our Past, Present, and Future

We are looking forward to an exciting and productive year at the ALS, with plans for new beamlines and capabilities coming online, and more users taking advantage of our technical and scientific expertise to produce a record number publications. At the ALS, we are encouraged by this year’s funding and are looking for new ways to focus on our core strengths while expanding partnerships to explore new opportunities. Read more »

The Electronic Structure of a Two-Dimensional Pure Copper Oxide Lattice

All superconducting cuprates share a common structure: charge reservoirs stacked between layers of CuO2. An undoped version, including only C and O, is not available in nature. By growing epitaxial films with a pulsed-laser deposition facility, researchers stabilized a 2D version of CuO, which can be thought as composed by two CuO2 planes staggered and superposed.

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An Iridate with Fermi Arcs

Researchers have discovered that “Fermi arcs,” much-debated features found in the electronic structure of high-temperature superconducting (HTSC) cuprates, can also be found in an iridate (iridium oxide) compound—strontium iridate. Read more »PPT-icon-35 PDF-icon-35

Graphene’s 3D Counterpart

ALS researchers have discovered a material that is essentially a 3D version of graphene — the 2D sheets of carbon through which electrons race at many times the speed at which they move through silicon. The discovery promises exciting new things to come for the high-­tech industry, including much faster transistors and far more compact hard drives. Read more »PPT-icon-35 PDF-icon-35

Minding the Gap Makes for More Efficient Solar Cells

Using novel materials to develop thin, flexible, and more efficient photovoltaic cells is one of the hottest topics in current materials research. A class of transition metals undergoes a dramatic change that makes them ideal for solar energy applications. Read more »