Answers are grounded in this paper and cite their sources.
We demonstrate quantum Hall resistance measurements with metrological accuracy in a small cryogen-free system operating at a temperature of around 3.8 K and magnetic fields below 5 T. Operating this system requires little experimental knowledge or laboratory infrastructure, thereby greatly advancing the proliferation of primary quantum standards for precision electrical metrology. This significant advance in technology has come about as a result of the unique properties of epitaxial graphene on SiC.
No takes yet. Share an insight, caveat, or question.
A 2015 study studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: