Fall 2018 PHYS838C Award Recipients

Congratulations, to our two Fall 2018 PHYS838C Award Recipients
The Student Award goes to Chris Eckberg for his presentation on "Chemical substitution in Nickel-Pnictide Superconductors" 
The Postdoc Award goes to Jen-Hao Yeh for his presentation on "Reduction of Cavity Photon Dephasing for Superconducting Qubits"


3rd Annual FQM Winter School and Workshop

The third annual FQM Winter School and Workshop was a grand success. Held January 14-18, 2019, at the University of Maryland, the event brought together senior and junior scientists to address topics at the forefront of current research into quantum materials, while also providing pedagogical background and practical training for junior scientists. The structure of the school includes mornings of pedagogical lectures by the nation's top practicing quantum materials scientists, with afternoons devoted to practical demonstrations in laboratories in the University of Maryland's Center for Nanophysics and Advanced Materials. The Workshop, following the school event, was focused on developments in research on the topological Kondo insulator Samarium Hexaboride, and was a grand success. Thanks to all that participated and contributed to this year's success!!

Acoustic Plasmons Discovered in Electron-Doped Cuprates

A collaboration of CNAM members including Richard L. Greene and Tarapada Sarkar, together with researchers from SLAC, ESRF, CNR-Spin and Binghamton University, has been exploring the Three-dimensional collective charge excitations in electron-doped copper oxide superconductors.

High-temperature copper oxide superconductors consist of stacked CuO2 planes, with electronic band structures and magnetic excitations that are primarily two-dimensional, but with superconducting coherence that is three-dimensional. This dichotomy highlights the importance of out-of-plane charge dynamics, which has been found to be incoherent in the normal state, within a limited range of momenta accessible by optics. In this research, we used resonant inelastic X-ray scattering to RIXS explore the charge dynamics across all three dimensions of the Brillouin zone. Polarization analysis of recently discovered collective excitations (modes) in electron-doped copper oxides reveals their charge origin, that is, without mixing with magnetic components. The excitations disperse along both the in-plane and out-of-plane directions, revealing its three-dimensional nature. The periodicity of the out-of-plane dispersion corresponds to the distance between neighboring CuO2 planes rather than to the crystallographic c-axis lattice constant, suggesting that the interplane Coulomb interaction is responsible for the coherent out-of-plane charge dynamics. The observed properties are hallmarks of the long-sought ‘acoustic plasmon’, which is a branch of distinct charge collective modes predicted for layered systems and argued to play a substantial part in mediating high-temperature superconductivity.

This work is now published October 31, 2018 in Nature. https://www.nature.com/articles/s41586-018-0648-3/#auth-1

Continued Funding for Quantum Materials Science

An independent review of the Gordon and Betty Moore Foundation's Emergent Phenomena in Quantum Systems (EPiQS) Initiative was recently conducted to assess the quality and impact of this $90M program (see report here). The EPiQS five-year program was aimed to stimulate breakthroughs that fundamentally change our understanding of the organizing principles of complex matter in solid materials. In its first phase, the initiative supported experimental investigators, materials synthesis investigators and fellows, and theory centers, along with funding for equipment grants and community- building activities. The Moore Foundation has just announced it is going to continue this program into a second phase, adding $95M for the next six years to support discovery-driven research in this rapidly growing field.