Spin filtering and entanglement detection due to spin-orbit interaction in carbon nanotube cross-junctions
arXiv:1307.7992 · doi:10.1103/PhysRevB.88.195403
Abstract
We demonstrate that due to their spin-orbit interaction carbon nanotube cross-junctions have attractive spin projective properties for transport. First, we show that the junction can be used as a versatile spin filter as a function of a backgate and a static external magnetic field. Switching between opposite spin filter directions can be achieved by small changes of the backgate potential, and a full polarization is generically obtained in an energy range close to the Dirac points. Second, we discuss how the spin filtering properties affect the noise correlators of entangled electron pairs, which allows us to obtain signatures of the type of entanglement that are different from the signatures in conventional semiconductor cross-junctions.
14 pages, 8 figures. Final version
References in corpus (16)
- Intrinsic and Rashba Spin-orbit Interactions in Graphene Sheets
- Spin-orbit coupling in curved graphene, fullerenes, nanotubes, and nanotube caps
- Coupling of Spin and Orbital Motion of Electrons in Carbon Nanotubes
- Near-unity Cooper pair splitting efficiency
- A valley-spin qubit in a carbon nanotube
- Spin-orbit interaction and anomalous spin relaxation in carbon nanotube quantum dots
- Large spin-orbit coupling in carbon nanotubes
- Valley-spin blockade and spin resonance in carbon nanotubes
- Electronic Transport Spectroscopy of Carbon Nanotubes in a Magnetic Field
- Bends In Nanotubes Allow Electric Spin Control and Coupling
- Spin-orbit coupling in a graphene bilayer and in graphite
- Molecular states in carbon nanotube double quantum dots
- Entanglement detection from conductance measurements in carbon nanotube Cooper pair splitters
- Energy entanglement in normal metal-superconducting forks
- Microwave spectroscopy of a Cooper pair beam splitter
- Entanglement detection for electrons via witness operators
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- Double quantum dot Cooper-pair splitter at finite couplings
- Non-collinear spin-orbit magnetic fields in a carbon nanotube double quantum dot
- Interaction effects in a microscopic quantum wire model with strong spin-orbit interaction
- Detection of Nonlocal Spin Entanglement by Light Emission from a Superconducting p-n Junction
- Detection of spin entanglement via spin-charge separation in crossed Tomonaga-Luttinger liquids
- Spin-polarizing electron beam splitter from crossed graphene nanoribbons
- Floquet-Nambu theory of electron quantum optics with superconductors
- Anomalous exchange correlation of quasiparticles with entangled Nambu spinors