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4 results for “beam splitter”
Crossed graphene nanoribbons as beam splitters and mirrors for electron quantum optics
<p>OPEN DATA related to the research publication:</p> <p>S. Sanz, P. Brandimarte, G. Giedke, D. Sánchez-Portal, and T. Frederiksen, <em>Crossed graphene nanoribbons as beam splitters and mirrors for electron quantum optics</em>, Phys. Rev. B <strong>102</strong>, 035436 (2020) [arXiv:2005.11391]</p> <p>Abstract: We analyze theoretically 4-terminal electronic devices composed of two crossed graphene nanoribbons (GNRs) and show that they can function as beam splitters or mirrors. These features are identified for electrons in the low-energy region where a single valence or conduction band is present. Our modeling is based on <em>pz</em> orbital tight-binding with Slater-Koster type matrix elements fitted to accurately reproduce the low-energy bands from density functional theory calculations. We analyze systematically all devices that can be constructed with either zigzag or armchair GNRs in AA and AB stackings. From Green's function theory the elastic electron transport properties are quantified as a function of the ribbon width. We find that devices composed of relatively narrow zigzag GNRs and AA-stacked armchair GNRs are the most interesting candidates to realize electron beam splitters with a close to 50-50 ratio in the two outgoing terminals. Structures with wider ribbons instead provide electron mirrors, where the electron wave is mostly transferred into the outgoing terminal of the other ribbon, or electron filters where the scattering depends sensitively on the wavelength of the propagating electron. We also test the robustness of these transport properties against variations in intersection angle, stacking pattern, lattice deformation (uniaxial strain), inter-GNR separation, and electrostatic potential differences between the layers. These generic features show that GNRs are interesting basic components to construct electronic quantum optical setups.</p>
Spin-polarizing electron beam splitter from crossed graphene nanoribbons
<p>OPEN DATA related to the research publication:</p> <p>S. Sanz, N. Papior, G. Giedke, D. Sánchez-Portal, M. Brandbyge, and T. Frederiksen, <br><em>Spin-polarizing electron beam splitter from crossed graphene nanoribbons</em>,<br><a href="https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.129.037701" target="_blank" rel="noopener">Phys. Rev. Lett. <strong>129</strong>, 037701 (2022)</a> [arXiv:2201.07147]</p> <p>Abstract: Junctions composed of two crossed graphene nanoribbons (GNRs) have been theoretically proposed as electron beam splitters where incoming electron waves in one GNR can be split coherently into propagating waves in <em>two</em> outgoing terminals with nearly equal amplitude and zero back-scattering. Here we scrutinize this effect for devices composed of narrow zigzag GNRs taking explicitly into account the role of Coulomb repulsion that leads to spin-polarized edge states within mean-field theory. We show that the beam-splitting effect survives the opening of the well-known correlation gap and, more strikingly, that a <em>spin-dependent</em> scattering potential emerges which spin polarizes the transmitted electrons in the two outputs. By studying different ribbons and intersection angles we provide evidence that this is a general feature with edge-polarized nanoribbons. A near-perfect polarization can be achieved by joining several junctions in series. Our findings suggest that GNRs are interesting building blocks in spintronics and quantum technologies with applications for interferometry and entanglement.</p>
A beam splitter for interacting quantum particles - videos
<p>Videos for the bachelor thesis "A beam splitter for interacting quantum particles".</p>
Dataset for "Two electrons interacting at a mesoscopic beam splitter"
<p>Data used to generate figures in the publication "Two electrons interacting at a mesoscopic beam splitter".</p>
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