Monday, March 25, 2013

Sign of Annihilating Majorana Pairs

We now have more evidence of the presence of Majorana fermions in a condensed matter system.

I earlier pointed out 2 separate experimental evidence that are consistent with the existence of Majorana fermions in such systems. Now comes the 3rd evidence.

To help confirm recent observations, Aaron Finck and his colleagues at the University of Illinois at Urbana-Champaign have created a new system that uses a semiconducting indium arsenide nanowire hooked up to two superconducting leads. Theoretical models predict that two Majorana quasiparticles will appear at the two ends of the nanowire when a strong magnetic field is turned on. The team observed the presumed signature—a conductance peak in the wire at zero voltage. They also witnessed the splitting and re-forming of this peak as they varied the magnetic field and electron chemical potential. Although these peak modulations could arise from electron scattering effects, the authors show that their data are consistent with the wave functions of the two Majorana quasiparticles extending towards each other inside the nanowire, which leads to their transformation (or annihilation) into a more mundane collective state.
So now, in the race to find these Majorana particles, it's 3 for condensed matter, 0 for high energy physics.


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