Gene Dresselhaus, a longtime research physicist at MIT’s Lincoln Laboratory and later the Francis Bitter Magnet Laboratory at MIT (now part of the MIT Plasma Science and Fusion Center), died peacefully at his home in California on Sept. 29. He was 91. Dresselhaus was a theoretical solid-state physicist whose work focused on the science of materials. He was an early pioneer behind the physics of what is now known as spintronics, a field concerned with a property of electrons called spin. He is the namesake of the Dresselhaus effect, a…