Ultralong Spin Lifetime in Light Alkali Atom Doped Graphene

Author(s)
B. G. Markus, P. Szirmai, K. F. Edelthalhammer, P. Eckerlein, A. Hirsch, F. Hauke, N. M. Nemes, Julio C. Chacon-Torres, B. Nafradi, L. Forro, T. Pichler, F. Simon
Abstract

Today's great challenges of energy and informational technologies are addressed with a singular compound, Li-and Na-doped few-layer graphene. All that is impossible for graphite (homogeneous and high-level Na doping) and unstable for single-layer graphene works very well for this structure. The transformation of the Raman G line to a Fano line shape and the emergence of strong, metallic-like electron spin resonance (ESR) modes attest the high level of graphene doping in liquid ammonia for both kinds of alkali atoms. The spin-relaxation time in our materials, deduced from the ESR line width, is 6-8 ns, which is comparable to the longest values found in spintransport experiments on ultrahigh-mobility graphene flakes. This could qualify our material as a promising candidate in spintronics devices. On the other hand, the successful sodium doping, this being a highly abundant metal, could be an encouraging alternative to lithium batteries.

Organisation(s)
Electronic Properties of Materials
External organisation(s)
Budapest University of Technology and Economics, École polytechnique fédérale de Lausanne, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Universidad Complutense De Madrid, Yachay Tech University, Universidad Tecnológica Equinoccial
Journal
ACS Nano
Volume
14
Pages
7492-7501
No. of pages
10
ISSN
1936-0851
DOI
https://doi.org/10.1021/acsnano.0c03191
Publication date
06-2020
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics, 104026 Spectroscopy
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/ultralong-spin-lifetime-in-light-alkali-atom-doped-graphene(2ac49ef9-85bc-48a9-9282-7e1133bd64c5).html