Quantum interference and Klein tunneling in graphene heterojunctions

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dc.creatorYoung, Andrea F.
dc.creatorKim, Philip
dc.date2008-08-06
dc.date2008-12-01
dc.date.accessioned2026-07-07T12:54:05Z
dc.date.available2026-07-07T12:54:05Z
dc.descriptionThe observation of quantum conductance oscillations in mesoscopic systems has traditionally required the confinement of the carriers to a phase space of reduced dimensionality. While electron optics such as lensing and focusing have been demonstrated experimentally, building a collimated electron interferometer in two unconfined dimensions has remained a challenge due to the difficulty of creating electrostatic barriers that are sharp on the order of the electron wavelength. Here, we report the observation of conductance oscillations in extremely narrow graphene heterostructures where a resonant cavity is formed between two electrostatically created bipolar junctions. Analysis of the oscillations confirms that p-n junctions have a collimating effect on ballistically transmitted carriers. The phase shift observed in the conductance fringes at low magnetic fields is a signature of the perfect transmission of carriers normally incident on the junctions and thus constitutes a direct experimental observation of ``Klein Tunneling.''
dc.description13 pages and 6 figures including supplementary information. The paper has been modified in light of new theoretical results available at arXiv:0808.0488
dc.identifierhttps://arxiv.org/abs/0808.0855
dc.identifierhttp://arxiv.org/abs/0808.0855
dc.identifierNature Physics 5, 222 - 226 (2009)
dc.identifierdoi:10.1038/nphys1198
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/223808
dc.subjectMesoscale and Nanoscale Physics
dc.subjectMaterials Science
dc.titleQuantum interference and Klein tunneling in graphene heterojunctions
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