Tuning the valley and chiral quantum state of Dirac electrons in van der Waals heterostructures
Chirality is a fundamental property of electrons with the relativistic spectrum found in graphene and topological insulators. It plays a crucial role in relativistic phenomena, such as Klein tunneling, but it is difficult to visualize directly. Here we report the direct observation and manipulation...
| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Article |
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American Association for the Advancement of Science
2016
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| Online Access: | https://eprints.nottingham.ac.uk/39486/ |
| _version_ | 1848795848259928064 |
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| author | Wallbank, J.R. Ghazaryan, D. Misra, A. Cao, Y. Tu, J.S. Piot, B.A. Potemski, M. Pezzini, S. Wiedmann, S. Zeitler, U. Lane, T.L.M. Morozov, S.V. Greenaway, M.T. Eaves, Laurence Geim, A.K. Fal'ko, V.I. Novoselov, K.S. Mishchenko, A. |
| author_facet | Wallbank, J.R. Ghazaryan, D. Misra, A. Cao, Y. Tu, J.S. Piot, B.A. Potemski, M. Pezzini, S. Wiedmann, S. Zeitler, U. Lane, T.L.M. Morozov, S.V. Greenaway, M.T. Eaves, Laurence Geim, A.K. Fal'ko, V.I. Novoselov, K.S. Mishchenko, A. |
| author_sort | Wallbank, J.R. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Chirality is a fundamental property of electrons with the relativistic spectrum found in graphene and topological insulators. It plays a crucial role in relativistic phenomena, such as Klein tunneling, but it is difficult to visualize directly. Here we report the direct observation and manipulation of chirality and pseudospin polarization in the tunneling of electrons between two almost perfectly aligned graphene crystals. We use a strong in-plane magnetic field as a tool to resolve the contributions of the chiral electronic states that have a phase difference between the two components of their vector wavefunction. Our experiments not only shed light on chirality, but also demonstrate a technique for preparing graphene’s Dirac electrons in a particular quantum chiral state in a selected valley. |
| first_indexed | 2025-11-14T19:38:36Z |
| format | Article |
| id | nottingham-39486 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:38:36Z |
| publishDate | 2016 |
| publisher | American Association for the Advancement of Science |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-394862020-05-04T18:07:45Z https://eprints.nottingham.ac.uk/39486/ Tuning the valley and chiral quantum state of Dirac electrons in van der Waals heterostructures Wallbank, J.R. Ghazaryan, D. Misra, A. Cao, Y. Tu, J.S. Piot, B.A. Potemski, M. Pezzini, S. Wiedmann, S. Zeitler, U. Lane, T.L.M. Morozov, S.V. Greenaway, M.T. Eaves, Laurence Geim, A.K. Fal'ko, V.I. Novoselov, K.S. Mishchenko, A. Chirality is a fundamental property of electrons with the relativistic spectrum found in graphene and topological insulators. It plays a crucial role in relativistic phenomena, such as Klein tunneling, but it is difficult to visualize directly. Here we report the direct observation and manipulation of chirality and pseudospin polarization in the tunneling of electrons between two almost perfectly aligned graphene crystals. We use a strong in-plane magnetic field as a tool to resolve the contributions of the chiral electronic states that have a phase difference between the two components of their vector wavefunction. Our experiments not only shed light on chirality, but also demonstrate a technique for preparing graphene’s Dirac electrons in a particular quantum chiral state in a selected valley. American Association for the Advancement of Science 2016-08-05 Article PeerReviewed Wallbank, J.R., Ghazaryan, D., Misra, A., Cao, Y., Tu, J.S., Piot, B.A., Potemski, M., Pezzini, S., Wiedmann, S., Zeitler, U., Lane, T.L.M., Morozov, S.V., Greenaway, M.T., Eaves, Laurence, Geim, A.K., Fal'ko, V.I., Novoselov, K.S. and Mishchenko, A. (2016) Tuning the valley and chiral quantum state of Dirac electrons in van der Waals heterostructures. Science, 353 (6299). pp. 575-579. ISSN 1095-9203 http://science.sciencemag.org/content/353/6299/575 doi:10.1126/science.aaf4621 doi:10.1126/science.aaf4621 |
| spellingShingle | Wallbank, J.R. Ghazaryan, D. Misra, A. Cao, Y. Tu, J.S. Piot, B.A. Potemski, M. Pezzini, S. Wiedmann, S. Zeitler, U. Lane, T.L.M. Morozov, S.V. Greenaway, M.T. Eaves, Laurence Geim, A.K. Fal'ko, V.I. Novoselov, K.S. Mishchenko, A. Tuning the valley and chiral quantum state of Dirac electrons in van der Waals heterostructures |
| title | Tuning the valley and chiral quantum state of Dirac electrons in van der Waals heterostructures |
| title_full | Tuning the valley and chiral quantum state of Dirac electrons in van der Waals heterostructures |
| title_fullStr | Tuning the valley and chiral quantum state of Dirac electrons in van der Waals heterostructures |
| title_full_unstemmed | Tuning the valley and chiral quantum state of Dirac electrons in van der Waals heterostructures |
| title_short | Tuning the valley and chiral quantum state of Dirac electrons in van der Waals heterostructures |
| title_sort | tuning the valley and chiral quantum state of dirac electrons in van der waals heterostructures |
| url | https://eprints.nottingham.ac.uk/39486/ https://eprints.nottingham.ac.uk/39486/ https://eprints.nottingham.ac.uk/39486/ |