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14 Aug 2000

Volume 77, Issue 7, pp. 921-1064

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Application of split-gate structures as tunable spin filters

M. J. Gilbert and J. P. Bird

Appl. Phys. Lett. 77, 1050 (2000); http://dx.doi.org/10.1063/1.1288816 (3 pages) | Cited 39 times

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We describe an electron filter that exploits the known magnetotransport properties of quantum point contacts to provide local and tunable control of the spin polarization in a semiconductor. When properly configured, we show that the conductance of this device gives a direct measure of the spin polarization of carriers transmitted through it. By modeling the transport through a potential barrier with experimentally realistic parameters, we discuss the factors which must be satisfied in order to successfully implement such a device. © 2000 American Institute of Physics.
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85.30.Fg Bulk semiconductor and conductivity oscillation devices (including Hall effect devices, space-charge-limited devices, and Gunn effect devices)
73.43.-f Quantum Hall effects
85.35.Ds Quantum interference devices
85.30.De Semiconductor-device characterization, design, and modeling

Stability of large-area electron-beam diodes

M. Friedman, S. Swanekamp, S. Obenschain, Y. Chan, L. Ludeking, and D. Smithe

Appl. Phys. Lett. 77, 1053 (2000); http://dx.doi.org/10.1063/1.1288520 (3 pages) | Cited 10 times

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In this letter, we report on experimental measurements of an instability in the large-area electron-beam diodes used to pump krypton–fluoride (KrF) lasers. The instability is identified as the transit-time instability and it is shown that it modulates the electron beam (spatially and temporally), producing a wide spread in the energy and momentum distributions of electrons emerging from the diode. These effects can enhance the energy deposited in the foils and adversely affect the energy-transfer efficiency to the KrF gas. Analysis and simulations of the instability suggest that resistively loaded slots in the cathode should eliminate the instability.
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52.59.Mv High-voltage diodes
42.55.Lt Gas lasers including excimer and metal-vapor lasers
41.75.Fr Electron and positron beams
42.60.-v Laser optical systems: design and operation
41.85.Ew Particle beam profile, beam intensity
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