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MARCH 2019 I DESIGN007 MAGAZINE 69 • September 10–13: Kirkland, WA • September 19–22: Schaumburg, IL • October 21–24: Anaheim, CA • November 2–5: Raleigh, NC • December 3–6: Manchester, NH Note: Dates and locations are subject to change. Contact EPTAC Corporation to check cur- rent dates and availability. A minimum enroll- ment of seven students is required for a class to be held. PCB Design Events PCB2Day • Controlling noise, EMI, and signal integrity in high-speed circuits and PCBs • April 17–18: Seattle, WA • June 13–14: Boston (Chelmsford), MA • Realize LIVE • June 10–13, 2019: Detroit, MI • Realize LIVE PCB West 2019 • September 9–11: Santa Clara, CA • The Future Next month, we will resume individual chapter spotlights and review feedback from the IPC DC Executive Board. IPC DC The IPC Designers Council is an international network of designers. Its mission is to pro- mote printed circuit board design as a profes- sion and to encourage, facilitate, and promote the exchange of information and integration of new design concepts through communica- tions, seminars, workshops, and professional certification through a network of local chap- ters. DESIGN007 References 1. IPC—Association Connecting Electronics Industries. "Introduction to Printed Circuit Board (PCB) Design." Stephen Chavez is a member of the IPC Designers Council Executive Board and chairman of the com- munications subcommittee. To read past columns or contact Chavez, click here. pulses of less than one trillionth of a second, researchers at Ames Laboratory were able to successfully isolate and con- trol the surface properties of a bismuth-selenium (Bi2Se3) 3D topological insulator. The method provides what is es- sentially a new "tuning knob" for controlling the protected surface conductivity in this category of materials. "We believe that this study could evolve into a bench- mark method of characterizing and manipulating these materials, so they can be better understood and adapt- ed for applications in new quantum technologies," said Jigang Wang, Ames Laboratory physicist and Iowa State University professor. The research is published in Nature Communications. (Source: Ames Laboratory) Scientists at the U.S. Department of Energy's Ames Lab- oratory have discovered a means of controlling the sur- face conductivity of a 3D topological insulator—a type of material that has potential applications in spintronic de- vices and quantum computing. Also, 3D topological insulators are emerging materi- als that hold great promise due to their unique electron conducting states on their surfaces, which is immune to backscattering, versus the bulk interior, which behaves as a normal insulator. But a challenge remains in under - pinning and selectively controlling their high-frequency transport at the surface without an increased scattering from the bulk material. By employing ultra-short mid-infrared and terahertz Laser Pulses Light the Way to Tuning Topological Materials for Spintronics and Quantum Computing

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