High-temperature quantum oscillations caused by recurring Bloch states in graphene superlattices
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 oscil...
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American Association for the Advancement of Science
2017
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| Online Access: | http://eprints.nottingham.ac.uk/44216/ http://eprints.nottingham.ac.uk/44216/ http://eprints.nottingham.ac.uk/44216/ http://eprints.nottingham.ac.uk/44216/1/1705.11170.pdf |
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nottingham-442162018-07-02T09:14:04Z http://eprints.nottingham.ac.uk/44216/ 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. 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. American Association for the Advancement of Science 2017-07-14 Article PeerReviewed application/pdf en http://eprints.nottingham.ac.uk/44216/1/1705.11170.pdf Krishna Kumar, R. and Chen, X. and Auton, G.H. and Mishchenko, A. and Bandurin, Denis A. and Morozov, S.V. and Cao, Y. and Khestanova, E. and Ben Shalom, M. and Kretinin, A.V. and Novoselov, K.S. and Eaves, Laurence and Grigorieva, Irina V. and Ponomarenko, L.A. and Fal’ko, V.I. and Geim, A.K. (2017) High-temperature quantum oscillations caused by recurring Bloch states in graphene superlattices. Science, 357 (6347). pp. 181-184. ISSN 1095-9203 http://science.sciencemag.org/content/357/6347/181 doi:10.1126/science.aal3357 doi:10.1126/science.aal3357 |
| repository_type |
Digital Repository |
| institution_category |
Local University |
| institution |
University of Nottingham Malaysia Campus |
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Nottingham Research Data Repository |
| collection |
Online Access |
| language |
English |
| description |
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. |
| format |
Article |
| author |
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. |
| spellingShingle |
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. High-temperature quantum oscillations caused by recurring Bloch states in graphene superlattices |
| author_facet |
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. |
| author_sort |
Krishna Kumar, R. |
| title |
High-temperature quantum oscillations caused by recurring Bloch states in graphene superlattices |
| title_short |
High-temperature quantum oscillations caused by recurring Bloch states in graphene superlattices |
| title_full |
High-temperature quantum oscillations caused by recurring Bloch states in graphene superlattices |
| title_fullStr |
High-temperature quantum oscillations caused by recurring Bloch states in graphene superlattices |
| title_full_unstemmed |
High-temperature quantum oscillations caused by recurring Bloch states in graphene superlattices |
| title_sort |
high-temperature quantum oscillations caused by recurring bloch states in graphene superlattices |
| publisher |
American Association for the Advancement of Science |
| publishDate |
2017 |
| url |
http://eprints.nottingham.ac.uk/44216/ http://eprints.nottingham.ac.uk/44216/ http://eprints.nottingham.ac.uk/44216/ http://eprints.nottingham.ac.uk/44216/1/1705.11170.pdf |
| first_indexed |
2018-09-06T13:31:56Z |
| last_indexed |
2018-09-06T13:31:56Z |
| _version_ |
1610865145679970304 |