Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 22, Issue 1-3, Pages 518-521Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physe.2003.12.059
Keywords
quantum dots; electron spin; photon-assisted tunneling; quantum bit
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We use a photon-assisted tunneling (PAT) technique to study the high-frequency response of one- and two-electron states in a semiconductor vertically coupled double-dot system. In particular, PAT associated with two-electron spin states in the spin-blockade regime is observed up to the absorption of 10 photons, indicating the preservation of long relaxation times and hence the robustness of our electron spin device under strong microwave irradiation. An alternative double-dot structure with greater flexibility in tuning the inter-dot coupling is presented and its transport characteristics are discussed. This structure is proposed for high-frequency control of two-electron spin states, as required for quantum computation schemes using electron spins in quantum dots. (C) 2003 Elsevier B.V. All rights reserved.
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