Multiple resonances and Coulomb blockade splitting in a quantum dot-DNA composite |
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Authors: | A Go G S Jeon J Yi |
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Affiliation: | (1) Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland;(2) JARA-FIT and II, Institute of Physics, RWTH Aachen, 52074 Aachen, Germany |
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Abstract: | Inspired by the recent realizations of quantum dot (QD)-DNA
conjugation, we study the spectral density of a magnetic impurity
coupled to a mesoscopic semiconducting host. Using a combination
of exact diagonalization technique and an analytic approach, we
demonstrate that various types of resonances occur according to
the relative position of impurity levels (IL) with respect to the
host levels (HL). While the usual Coulomb peaks appear when the IL
lie inside a band gap, with IL approaching HL and hybridization
activated, they shift nonlinearly with the repulsion strength and
even undergo splitting for a strong hybridization. When IL merge
into HL, multiple resonances of a comblike structure are found
along with a parity effect. |
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Keywords: | |
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