Research Article

Second Chern number of a quantum-simulated non-Abelian Yang monopole

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Science  29 Jun 2018:
Vol. 360, Issue 6396, pp. 1429-1434
DOI: 10.1126/science.aam9031

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Going beyond the first Chern number

Topological properties of physical systems are reflected in so-called Chern numbers: A nonzero Chern number typically means that a system is topologically nontrivial. Sugawa et al. engineered a cold atom system with a nonzero second Chern number, in contrast to condensed matter physics, where only the first Chern number is usually invoked. The exotic topology relates to the emergence of a type of magnetic monopole called the Yang monopole (known from theoretical high-energy physics) in a five-dimensional space of internal degrees of freedom in a rubidium Bose-Einstein condensate. The results illustrate the potential of cold atoms physics to simulate high-energy phenomena.

Science, this issue p. 1429