R. Krishna Krishna Kumar
High-temperature quantum oscillations caused by recurring Bloch states in graphene superlattices
Krishna Kumar, R. Krishna; 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
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 laurence.eaves@nottingham.ac.uk
Research Professor
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.
Citation
Krishna Kumar, R. K., 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), 181-184. https://doi.org/10.1126/science.aal3357
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 29, 2017 |
Publication Date | Jul 14, 2017 |
Deposit Date | Jul 17, 2017 |
Publicly Available Date | Jul 17, 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 |
Pages | 181-184 |
DOI | https://doi.org/10.1126/science.aal3357 |
Public URL | https://nottingham-repository.worktribe.com/output/872730 |
Publisher URL | http://science.sciencemag.org/content/357/6347/181 |
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 |
Contract Date | Jul 17, 2017 |
Files
1705.11170.pdf
(2.5 Mb)
PDF
You might also like
Resonant tunnelling and negative differential conductance in graphene transistors
(2013)
Journal Article
Monte Carlo study on anomalous carrier diffusion in inhomogeneous semiconductors
(2015)
Journal Article
Resonant Zener tunnelling via zero-dimensional states in a narrow gap diode
(2016)
Journal Article
Downloadable Citations
About Repository@Nottingham
Administrator e-mail: discovery-access-systems@nottingham.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search