Cotunneling renormalization in carbon nanotube quantum dots
arXiv:1206.1359 · doi:10.1103/PhysRevB.86.075452
Abstract
We determine the level-shifts induced by cotunneling in a Coulomb blockaded carbon nanotube quantum dot using leading order quasi-degenerate perturbation theory within a single nanotube quartet. It is demonstrated that otherwise degenerate and equally tunnel-coupled and states are mixed by cotunneling and therefore split up in energy except at the particle/hole-symmetric midpoints of the Coulomb diamonds. In the presence of an external magnetic field, we show that cotunneling induces a gate-dependent -factor renormalization, and we outline different scenarios which might be observed experimentally, depending on the values of both intrinsic splitting and spin-orbit coupling.
12 pages, 7 figures
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