Electron Transport in Nanoporous Graphene: Probing
the Talbot Effect
Posted on 2018-12-12 - 00:00
Electrons
in graphene can show diffraction and interference phenomena
fully analogous to light thanks to their Dirac-like energy dispersion.
However, it is not clear how this optical analogy persists in nanostructured
graphene, for example, with pores. Nanoporous graphene (NPG) consisting
of linked graphene nanoribbons has recently been fabricated using
molecular precursors and bottom-up assembly (Moreno et al. Science 2018, 360, 199). We
predict that electrons propagating in NPG exhibit the interference
Talbot effect, analogous to photons in coupled waveguides. Our results
are obtained by parameter-free atomistic calculations of real-sized
NPG samples based on seamlessly integrated density functional theory
and tight-binding regions. We link the origins of this interference
phenomenon to the band structure of the NPG. Most importantly, we
demonstrate how the Talbot effect may be detected experimentally using
dual-probe scanning tunneling microscopy. Talbot interference of electron
waves in NPG or other related materials may open up new opportunities
for future quantum electronics, computing, or sensing.
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Calogero, Gaetano; Papior, Nick R.; Kretz, Bernhard; Garcia-Lekue, Aran; Frederiksen, Thomas; Brandbyge, Mads (2018). Electron Transport in Nanoporous Graphene: Probing
the Talbot Effect. ACS Publications. Collection. https://doi.org/10.1021/acs.nanolett.8b04616
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AUTHORS (6)
GC
Gaetano Calogero
NP
Nick R. Papior
BK
Bernhard Kretz
AG
Aran Garcia-Lekue
TF
Thomas Frederiksen
MB
Mads Brandbyge
KEYWORDS
real-sized NPG samplesNanoporous graphenedual-probe scanning tunneling microscopyinterference phenomenonNPG exhibitelectron wavesband structureNanoporous Grapheneparameter-free atomistic calculationsTalbot effectlight thanksDirac-like energy dispersionelectrons propagatinginterference Talbot effectTalbot interferenceinterference phenomenaelectron Transportfuture quantum electronicsgraphene nanoribbonsnanostructured graphenebottom-up assemblytight-binding regionsscience 2018Talbot Effect Electrons