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19 Jul 1999

Volume 75, Issue 3, pp. 307-435

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Control of Coulomb blockade characteristics with dot size and density in planar metallic multiple tunnel junctions

E. M. Ford and H. Ahmed

Appl. Phys. Lett. 75, 421 (1999); http://dx.doi.org/10.1063/1.124395 (3 pages) | Cited 9 times

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Coulomb gap width has been controlled in a planar metallic structure made by focused ion-beam deposition with landing energies in the range 10 eV–1 keV. Gold islands form by surface diffusion, with size and density determined by dose and landing energy. Increasing the dose reduces the Coulomb gap systematically as larger islands form and density is reduced. Lower ion landing energy increases the operating temperature despite an apparent increase in island size. Multiple tunnel junctions of lengths 10–200 nm have been fabricated and Coulomb blockade observed up to 200 K, with strong nonlinearities evident at room temperature. Single-electron transport through a single island has also been observed, exhibiting a periodic Coulomb staircase. © 1999 American Institute of Physics.
Show PACS
73.23.Hk Coulomb blockade; single-electron tunneling
73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems
73.61.At Metal and metallic alloys
68.35.Fx Diffusion; interface formation
68.35.B- Structure of clean surfaces (and surface reconstruction)

Evolution of Coulomb blockade spectra in parallel coupled quantum dots

A. S. Adourian, C. Livermore, R. M. Westervelt, K. L. Campman, and A. C. Gossard

Appl. Phys. Lett. 75, 424 (1999); http://dx.doi.org/10.1063/1.124396 (3 pages) | Cited 17 times

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We report low-temperature conductance measurements in the Coulomb blockade regime on two nominally identical tunnel-coupled quantum dots in parallel defined electrostatically in the two-dimensional gas of a GaAs/AlGaAs heterostructure. We find that the Coulomb blockade spectra of such devices exhibit two distinct sets of peaks, each of which behaves differently with varying interdot tunnel conductance and with temperature. The results conform to recent theories regarding the role of interdot quantum charge fluctuations, and provide evidence for the possible role of inelastic cotunneling between dots at finite interdot conductances. © 1999 American Institute of Physics.
Show PACS
73.23.Hk Coulomb blockade; single-electron tunneling
73.61.Ey III-V semiconductors
73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems
85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)
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