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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.

Authors

J. R. Wallbank john.wallbank@manchester.ac.uk

D. Ghazaryan dav280892@gmail.com

A. Misra abhishek.misra@manchester.ac.uk

Y. Cao yang.cao@manchester.ac.uk

J. S. Tu

B. A. Piot benjamin.piot@lncmi.cnrs.fr

M. Potemski marek.potemski@lncmi.cnrs.fr

S. Pezzini s.pezzini@science.ru.nl

S. Wiedmann S.Wiedmann@science.ru.nl

U. Zeitler U.Zeitler@science.ru.nl

T.L.M. Lane thomas.lane-3@postgrad.manchester.ac.uk

S. V. Morozov morozov@iptm.ru

M. T. Greenaway ppamg2@exmail.nottingham.ac.uk

Laurence Eaves laurence.eaves@nottingham.ac.uk

A. K. Geim andre.k.geim@manchester.ac.uk

V. I. Fal'ko vladimir.falko@manchester.ac.uk

K. S. Novoselov konstantin.novoselov@manchester.ac.uk

A. Mishchenko artem.mishchenko@gmail.com



Abstract

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.

Journal Article Type Article
Publication Date Aug 5, 2016
Journal Science
Print ISSN 0036-8075
Electronic ISSN 1095-9203
Publisher American Association for the Advancement of Science
Peer Reviewed Peer Reviewed
Volume 353
Issue 6299
Pages 575-579
APA6 Citation Wallbank, J. . R., Ghazaryan, D., Misra, A., Cao, Y., Tu, J. . S., Piot, B. A., …Mishchenko, A. (2016). Tuning the valley and chiral quantum state of Dirac electrons in van der Waals heterostructures. Science, 353(6299), 575-579. https://doi.org/10.1126/science.aaf4621
DOI https://doi.org/10.1126/science.aaf4621
Publisher URL http://science.sciencemag.org/content/353/6299/575
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information Supplementary information (3 pages) appears at http://science.sciencem.../08/03/353.6299.575.DC1

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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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