Helical quantum Hall phase in graphene on SrTiO3

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Science  14 Feb 2020:
Vol. 367, Issue 6479, pp. 781-786
DOI: 10.1126/science.aax8201

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Controlling the interactions

Near charge neutrality and subject to perpendicular magnetic fields, graphene is expected to become a ferromagnet with edge states not unlike those in two-dimensional topological insulators. Observing this effect experimentally has proven tricky because very large magnetic fields are needed to overcome the effect of electron-electron interactions, which drive the system to competing states. Instead of amping up the field, Veyrat et al. placed their graphene samples on a substrate made out of strontium titanate, which effectively screened the interactions. Transport measurements confirmed the formation of the characteristic edge states.

Science, this issue p. 781

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