🚨 Physicists have made a groundbreaking discovery of a quasiparticle known as a semi-Dirac fermion, which exhibits an unusual property: it only has an effective mass when moving in one direction.
This finding, which comes 16 years after the particle was first theorized, challenges the conventional understanding of mass in physics, where mass typically remains constant regardless of movement direction.
The semi-Dirac fermion was identified within a ZrSiS semi-metal crystal at extremely low temperatures of -269 degrees Celsius (-452 degrees Fahrenheit). The discovery was unexpected; researchers were not specifically searching for this quasiparticle but noticed unusual signatures during their experiments.
The effective mass of the semi-Dirac fermion varies based on its movement: it behaves as if it has mass in one direction while being massless in another. This behavior is akin to a train that moves freely along certain tracks (representing energy) but encounters resistance and gains mass when switching to
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