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16 Oct 2000

Volume 77, Issue 16, pp. 2437-2616

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Enhanced quantized current driven by surface acoustic waves

J. Ebbecke, G. Bastian, M. Blöcker, K. Pierz, and F. J. Ahlers

Appl. Phys. Lett. 77, 2601 (2000); http://dx.doi.org/10.1063/1.1319190 (3 pages) | Cited 20 times

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We present the experimental realization of different approaches to increase the amount of quantized current which is driven by surface acoustic waves through split-gate structures in a two-dimensional electron gas. Samples with driving frequencies of up to 4.7 GHz have been fabricated without a deterioration of the precision of the current steps, and a parallelization of two channels with correspondingly doubled current values have been achieved. We discuss theoretical and technological limitations of these approaches for metrological applications as well as for quantum logics. © 2000 American Institute of Physics.
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73.23.-b Electronic transport in mesoscopic systems
85.35.Ds Quantum interference devices
73.50.Rb Acoustoelectric and magnetoacoustic effects
85.35.Gv Single electron devices
43.35.Pt Surface waves in solids and liquids
73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems

Scanning nanolithography using a material-filled nanopipette

Mun-Heon Hong, Ki Hyun Kim, Joonho Bae, and Wonho Jhe

Appl. Phys. Lett. 77, 2604 (2000); http://dx.doi.org/10.1063/1.1319181 (3 pages) | Cited 23 times

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A scanning nanolithography is demonstrated by employing near-field optical microscopy with a pulled micropipette which is used for material transport as well as distance regulation. Delivering the photoresist through the small aperture (300 nm diameter) of the pulled pipette with the shear-force distance control, we have fabricated nanometric dots (300 nm diameter) on the gold-sputtered substrate. This scheme may be also useful in nanometric control of chemical reaction and repair of nanometric structures. © 2000 American Institute of Physics.
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81.07.-b Nanoscale materials and structures: fabrication and characterization
81.16.-c Methods of micro- and nanofabrication and processing
85.35.-p Nanoelectronic devices
85.40.Hp Lithography, masks and pattern transfer
07.79.Fc Near-field scanning optical microscopes
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