For the first time, physicists have built a two-dimensional experimental system that allows them to study the physical properties of materials theorized to exist only in four-dimensional space. An international team of researchers demonstrated that the behavior of particles of light can be made to match predictions about the four-dimensional version of the ‘quantum Hall effect’ – a phenomenon at the root of three Nobel Prizes in physics – in a two-dimensional array of 'waveguides.’
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2018/01/180103132748.htm
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