Tuning the valley and chiral quantum state of Dirac electrons in van der Waals heterostructures
journal contributionposted on 2018-04-09, 11:06 authored by J.R. Wallbank, D. Ghazaryan, A. Misra, Y. Cao, J.S. Tu, B.A. Piot, M. Potemski, S. Pezzini, S. Wiedmann, U. Zeitler, T.L.M. Lane, S.V. Morozov, Mark GreenawayMark Greenaway, Laurence Eaves, A.K. Geim, V.I. Fal'ko, K.S. Novoselov, A. Mishchenko
© 2016, American Association for the Advancement of Science. All rights reserved.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 wave function. 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.
Pages575 - 579
CitationWALLBANK, J.R. ...et al., 2016. Tuning the valley and chiral quantum state of Dirac electrons in van der Waals heterostructures. Science, 353(6299), pp. 575-579.
Publisher© The Authors. Published by the American Association for the Advancement of Science
- AM (Accepted Manuscript)
NotesThis 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, 353(6299), pp. 575-579, doi: 10.1126/science.aaf4621