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Brookhaven Scientist Peter Johnson Shares American Physical Society Oliver E. Buckley Prize

Award Given for Advancing Photoemission Spectroscopy, High-Temperature Superconductor Studies

Peter Johnson discusses the mystery of superconductivity and the field's importance to energy research.

UPTON, NY — Peter Johnson, a physicist at the U.S. Department of Energy’s Brookhaven National Laboratory, is one of three recipients of the American Physical Society’s (APS) 2011 Oliver E. Buckley Prize in Condensed Matter Physics.

Johnson will receive the award at the 2011 APS March meeting in Dallas, Texas along with Zhi-Xun Shen of SLAC National Accelerator Laboratory and Juan Carlos Campuzano of Argonne National Laboratory. The prize honors them for “innovation in angle-resolving photoemission spectroscopy, which advanced the understanding of the cuprate superconductors, and transformed the study of strongly correlated electronic systems.”

“This was a very pleasant surprise and the fact that they awarded this prize to all three of us was also a pleasant surprise — we’ve all been very competitive for a long time,” Johnson said. “It is an honor for myself, my group, and the Laboratory to receive this recognition from the larger community.”

Peter Johnson

Click on the image to download a high-resolution version. Peter Johnson

Johnson has been working with photoemission spectroscopy since the early 1980s, when he was pursuing postdoctoral research at Bell Laboratories with the pioneer of angle-resolved photoemission spectroscopy, Neville Smith. In photoemission spectroscopy, physicists shoot a photon, the elementary particle of light, into a material and an electron absorbs the photon’s energy and emerges. Physicists can then study the material by examining the properties of the displaced electron.

Johnson has worked with various forms of photoemission spectroscopy, including inverse (time-reversed), spin-polarized, and high-resolution photoemission spectroscopy. It is this last variant for which he is being honored. The techniques that Johnson helped develop have provided more insight than any other into one of the major challenges of modern physics, namely strongly correlated electronic materials.

In the second half of the 1980s, a new class of materials was discovered that could conduct electricity with no resistance to the flow of electrons. This property, called superconductivity, had been observed previously, however, the new materials could superconduct at higher temperatures than ever before achieved.

These cuprate superconductors are one example of strongly correlated materials. Whereas in most simple metals, the interactions between electrons are screened by the mutual interactions of many electrons, in strongly correlated materials there are strong residual interactions between electrons that hold them in place. The work of Johnson and his fellow awardees has provided considerable insight into the properties of such materials.

Although there is no agreement in the field as to the mechanism responsible for high-temperature superconductivity, the materials are already being put to the test in energy applications. These include superconducting wire to improve existing energy grids and superconducting coils for storing power from energy sources such as solar panels.

Johnson, the Chair of Brookhaven’s Condensed Matter Physics & Materials Science Department, received his Ph.D. in physics at Warwick University in 1978. Following graduation, he worked at Warwick and Bell Laboratories until 1982, when he joined Brookhaven. Named a senior physicist in 2000, he became the Acting Associate Chair of Brookhaven’s Physics Department in 2003, and Deputy Chair of the Condensed Matter Physics & Materials Science Department in 2006. He became Chair a year later. He leads the electron spectroscopy group at Brookhaven, and received the Laboratory’s Science and Technology award in 2001. Johnson is a Fellow of the American Association for the Advancement of Science, the American Physical Society, and the Institute of Physics in the United Kingdom. He is the author of more than 160 peer-reviewed scientific papers.

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