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...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Article |
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American Association for the Advancement of Science
2017
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| Online Access: | https://eprints.nottingham.ac.uk/44216/ |
| _version_ | 1848796864266108928 |
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| 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. |
| 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. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| 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. |
| first_indexed | 2025-11-14T19:54:45Z |
| format | Article |
| id | nottingham-44216 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:54:45Z |
| publishDate | 2017 |
| publisher | American Association for the Advancement of Science |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-442162020-05-04T18:55:31Z https://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 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. 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 |
| 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 |
| title | 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_short | 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 |
| url | https://eprints.nottingham.ac.uk/44216/ https://eprints.nottingham.ac.uk/44216/ https://eprints.nottingham.ac.uk/44216/ |