Manipulation of a single charge in a double quantum dot

• Published in: Physical review letters Vol. 93; no. 18; pp. 186802.1 - 186802.4
• Main Authors: PETTA, J. R, JOHNSON, A. C, MARCUS, C. M, HANSON, M. P, GOSSARD, A. C
• Format: Journal Article
• Language: English
• Published: Ridge, NY American Physical Society 29-10-2004
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronic transport in multilayers, nanoscale materials and structures; Exact sciences and technology; Physics; Quantum dots; Aluminium arsenides; Scanning electron microscopy; Gallium arsenides; Inorganic compounds; Electrical conductivity; Microwave radiation; Quantum dots; Ternary compounds; Two-level systems; Binary compounds; Electric charges; Time domain method; Transport processes; Resonance
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.93.186802

We manipulate a single electron in a fully tunable double quantum dot using microwave excitation. Under resonant conditions, microwaves drive transitions between the (1,0) and (0,1) charge states of the double dot. Local quantum point contact charge detectors enable a direct measurement of the photon-induced change in occupancy of the charge states. From charge sensing measurements, we find T1 approximately 16 ns and a lower bound estimate for T*(2) of 400 ps for the charge two-level system.