Hyperfine interaction and electron-spin decoherence in graphene and carbon nanotube quantum dots - Condensed Matter > Mesoscale and Nanoscale PhysicsReportar como inadecuado




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Abstract: We analytically calculate the nuclear-spin interactions of a single electronconfined to a carbon nanotube or graphene quantum dot. While theconduction-band states in graphene are p-type, the accordant states in a carbonnanotube are sp-hybridized due to curvature. This leads to an interestinginterplay between isotropic and anisotropic hyperfine interactions. By usingonly analytical methods, we are able to show how the interaction strengthdepends on important physical parameters, such as curvature and isotopeabundances. We show that for the investigated carbon structures, the 13Chyperfine coupling strength is less than 1 mu-eV, and that the associatedelectron-spin decoherence time can be expected to be several tens ofmicroseconds or longer, depending on the abundance of spin-carrying 13C nuclei.Furthermore, we find that the hyperfine-induced Knight shift is highlyanisotropic, both in graphene and in nanotubes of arbitrary chirality.



Autor: Jan Fischer, Bjoern Trauzettel, Daniel Loss

Fuente: https://arxiv.org/







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