Conventional quantum mechanics didn't have such transitions, and Dirac's relativistic Schrödinger equation (naturally called the Dirac equation) did not have such a hyperfine transition either, ...

It might be possible to probe a close analogue of zitterbewegung by recreating the mathematics of Dirac's equation in a quantum wire. Dirac's equation has an infinite number of solutions with ...

In his short career, Ettore Majorana made several profound contributions. One of them, his concept of 'Majorana fermions' — particles that are their own antiparticle — is finding ever wider ...