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

Krishna Kumar, R.; Chen, X.; Auton, G.H.; Mishchenko, A.; Bandurin, Denis A.; Morozov, S.V.; Cao, Y.; Khestanova, E.; Ben Shalom, M.; Kretinin, A.V.; Novoselov, K.S.; Eaves, Laurence; Grigorieva, Irina V.; Ponomarenko, L.A.; Fal’ko, V.I.; Geim, A.K.

Authors

R. Krishna Kumar

X. Chen

G.H. Auton

A. Mishchenko

Denis A. Bandurin

S.V. Morozov

Y. Cao

E. Khestanova

M. Ben Shalom

A.V. Kretinin

K.S. Novoselov

Laurence Eaves

Irina V. Grigorieva

L.A. Ponomarenko

V.I. Fal’ko

A.K. Geim



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.

Journal Article Type Article
Publication Date Jul 14, 2017
Journal Science
Print ISSN 0036-8075
Electronic ISSN 1095-9203
Publisher American Association for the Advancement of Science
Peer Reviewed Peer Reviewed
Volume 357
Issue 6347
APA6 Citation Krishna Kumar, R., Chen, X., Auton, G., Mishchenko, A., Bandurin, D. A., Morozov, S., …Geim, A. (2017). High-temperature quantum oscillations caused by recurring Bloch states in graphene superlattices. Science, 357(6347), doi:10.1126/science.aal3357
DOI https://doi.org/10.1126/science.aal3357
Publisher URL http://science.sciencemag.org/content/357/6347/181
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This is the author’s version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science on Vol. 357, 14 July 2017, DOI: 10.1126/science.aal3357

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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