High-temperature quantum oscillations caused by recurring Bloch states in graphene superlattices

Roshan Krishna Kumar, Shanshan Chen, Gregory Auton, Artem Mishchenko, Denis Bandurin, Sergey Morozov, Yang Cao, Ekaterina Khestanova, Moshe Ben Shalom, Andrey Kretinin, Konstantin Novoselov, Laurence Eaves, Irina Grigorieva, L A Ponomarenko, Vladimir Fal'ko, Andre Geim

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Abstract

Cyclotron motion of charge carriers in metals and semiconductors leads to Landau quantization and magneto-oscillatory behavior in their properties. Cryogenic temperatures are usually required to observe these oscillations. We show that graphene superlattices support a different type of quantum oscillations that do not rely on Landau quantization. The oscillations are extremely robust and persist well above room temperature in magnetic fields of only a few T. We attribute this phenomenon to repetitive changes in the electronic structure of superlattices such that charge carriers experience effectively no magnetic field at simple fractions of the flux quantum per superlattice unit cell. Our work points at unexplored physics in Hofstadter butterfly systems at high temperatures.
Original languageEnglish
Pages (from-to)181-184
JournalScience
Volume357
Issue number6347
DOIs
Publication statusPublished - 14 Jul 2017

Research Beacons, Institutes and Platforms

  • National Graphene Institute

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