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Scientists Find Long-Sought Majorana Particle
New submitter boner writes "In a follow-up to an earlier Slashdot story, scientists at the Technical University of Delft in the Netherlands yesterday published their findings that they have indeed found the Majorana particle. The announcement on the university website provides both a summary of the academic paper (PDF) and background of this groundbreaking discovery. Quoting: 'Majorana fermions are very interesting – not only because their discovery opens up a new and uncharted chapter of fundamental physics; they may also play a role in cosmology. A proposed theory assumes that the mysterious ‘dark matter, which forms the greatest part of the universe, is composed of Majorana fermions. Furthermore, scientists view the particles as fundamental building blocks for the quantum computer.'"
This is not like finding the Higgs Boson. The majorana fermion they created was (hard to tell exactly how from TFA) a condensed matter excitation with the properties of a majorana fermion, not a fundamental particle. Pretty cool though.
A particle that is its own anti-particle? Sounds pretty special! Of course, that would also describe photons, the commonest particle in the universe.
Come on, science reporting.
Photons are bosons. Bosons being their own antiparticle is nothing unusual. A fermion that is its own antiparticle has never been observed in nature before.
It is their quantum computing research group. http://stationq.ucsb.edu/
The summary makes it sound like there is a particle that physicists have been seeking called a Majorana particle when in fact a Majorana particle is named because of its quantum field theory behavior. In this case NO particle was discovered but an excitation of a novel condensed matter state which behaves in an analogous way to a Majorana fermion. So in conclusion this very interesting discovery was both summarized and publicized in a misleading way.
There is one possible exception, the neutrino is a half spin fermion and if it really is zero mass it would be its own anti-particle.
Actually it's the other way around: massless Fermions are Dirac, because of Chiral symmetry: in the Standard Model with massless neutrinos, all neutrinos are Dirac particles, with neutrinos being left-handed and all antineutrinos being right-handed. Mass terms break chiral symmetry, and a massive neutrino could be either Dirac or majorana depending on how the mass term is generated:
https://en.wikipedia.org/wiki/Sterile_neutrino#Majorana_or_Dirac.3F