Quite esoteric, but perhaps of interest ---
"Electrons with no mass acquire a mass in the presence of a high magnetic field"
http://phys.org/news/2016-08-e…esence-high-magnetic.html
"Zeeman splitting and dynamical mass generation in Dirac semimetal ZrTe5"
http://www.nature.com/ncomms/2…516/full/ncomms12516.html