Spring 2018

Secretary of the Air Force (SecAF) 2030 Science and Technology (S&T) Study

  • By Burcu Ozden
  • 17 January 2018

Secretary of the Air Force Heather Wilson announced in September 2017 inception of the "S&T Strategy 2030" study. The study's objective is to update the Air Force methods for conducting research and development to meet the projected national security challenges of 2030. 

Secretary Wilson appointed the Air Force Research Laboratory (AFRL) to lead this strategy development. The Air Force's goals for the study are:1. Evaluate technical approaches and focus areas to advance the Air Force's mission through R&D; and 2. Improve Air Force processes and organizational structures to manage early stage research. 


Control and Local Measurement of the Spin Chemical Potential in a Magnetic Insulator

Chunhui Du
Friday, February 9, 2018 - 4:30pm to 5:30pm

In recent decades, a large scientific effort has focused on harnessing spin transport for providing insights into novel materials and low-dissipation information processing. We introduce single spin magnetometry based on nitrogen-vacancy (NV) centers in diamond as a new and generic platform to locally probe spin chemical potentials which essentially determine the flow of spin currents. We use this platform to investigate magnons in a magnetic insulator yttrium iron garnet (YIG) on a 100 nanometer length scale. We demonstrate that the local magnon chemical potential can...

Spin Dynamics of Topological Spin Textures in Chiral Magnets

Emrah Turgut
Thursday, January 25, 2018 - 4:30pm to 5:30pm

The chiral spin textures are a consequence of the anti-symmetric exchange interaction, which presents in the material systems with broken inversion symmetry, such as B20FeGe. This interaction enables chiral magnetic order, including topologically non-trivial magnetic skyrmions, which display rich new magnetic phenomena and require low critical current densities to manipulate.  This makes magnetic skyrmions a promising platform for power-efficient spintronics applications. Therefore, a deeper understanding of the static and dynamic magnetic properties of these materials...

Tunable Berry Phase and Berry Curvature Effects in 2D and 3D Materials

Long Ju
Monday, January 22, 2018 - 4:30pm to 5:30pm

Berry phase played an important role in quantum mechanics and underlying the physics of a wide range of materials from topological phases of matters to various 2D materials. While the effect of Berry phase has been extensively studied and shown through quantized electron transport experiment, the geometric aspect of wavefunction— determined by Berry curvature has remained much less understood experimentally. In this talk, I will use bilayer graphene as a model system to demonstrate effects of Berry phase and Berry curvature on materials’ electronic and optical...

Professor Emeritus Edward Gerjuoy Publishes Paper on Julian Schwinger

  • By Burcu Ozden
  • 12 January 2018

An article by PQI member Edward Gerjuoy will be included in a book titled "Memories of Julian Schwinger" in a new edition of Schwinger's book Quantum Mechanics - Symbolism of Atomic Measurements (Springer, 2018), published for the centennial of Schwinger's birth. Schwinger, who shared the 1965 Nobel Prize in Physics with Richard Feynman and Sin-Itiro Tomonaga for the invention of quantum electrodynamics, was a classmate of Gerjuoy's at City College of New York in the 1930s. Gerjuoy noted that he had a better grade in classical mechanics than Schwinger did.

Coupling superconducting qubits and mechanics: A path to quantum communication?

Andrew Cleland
Monday, April 16, 2018 - 4:15pm

Superconducting qubits offer excellent prospects for manipulating quantum information, with good qubit lifetimes, high fidelity single- and two-qubit gates, and straightforward scalability (admittedly with multi-dimensional interconnect challenges). One interesting route for experimental development is the exploration of hybrid systems, i.e. coupling superconducting qubits to other systems. I will report on our group's efforts to develop approaches that will allow interfacing superconducting qubits in a quantum-coherent fashion to mechanical resonators and to optomechanical devices. The...

Interfacial Engineering of Quantum Materials

Shuolong Yang
Monday, January 29, 2018 - 3:00pm to 4:00pm

Quantum materials are fascinating platforms where macroscopic quantum phenomena occur. As a prominent example, superconductors conduct electricity with no dissipation at low temperatures, holding great promise to address global energy challenges. It is of tremendous scientific and technological interest to enhance superconducting transition temperatures. In this talk I will elucidate the principles of interfacial engineering and co-operative interactions through studies of bulk superconductors, and demonstrate how I implement these concepts in fabricating an iron selenide/strontium...