Electronic transport in graphene decorated with adatoms or nanoparticles
ORAL
Abstract
There is much interest in inducing a spin-orbit coupling into monolayer graphene in order to engineer the Kane-Mele Hamiltonian and thereby enable observation of the quantum spin Hall effect in graphene. Numerous adatoms have been studied toward this end. Here, we present measurements of monolayer graphene Hall bars with dilute coatings of either osmium adatoms or Bi2Te3 nanoparticles (NPs). With osmium adatoms, we find an unusual hole doping to occur, whereas most metals show electron doping. Nanoparticles of Bi2Te3 have recently been reported to yield possibly quantized transport [1]. We use high quality NPs, monodispersed with diameters of ~15 nm. Transport is studied after depositing the nanoparticles, and again after an argon anneal to remove the polyvinylidene fluoride coating on the NPs. In this case a small electron doping response is observed. Further measurements on higher density coatings of both osmium adatoms and Bi2Te3 nanoparticles will be discussed.
[1] K. Hatsuda, H. Mine, T. Nakamura, J. Li, R. Wu, S. Katsumoto, J. Haruyama, arXiv:1806.07027, (2018)
[1] K. Hatsuda, H. Mine, T. Nakamura, J. Li, R. Wu, S. Katsumoto, J. Haruyama, arXiv:1806.07027, (2018)
*Sigma Xi Grant-in-Aid of Research
Sandia National Labs
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Presenters
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Jamie Elias
- Department of Physics, Washington University in St. Louis, 1 Brookings Dr, St. Louis, MO 63130
- Physics, Washington University, St. Louis