Kabushiki Kaisha Toshiba

Mark Levence Leadbeater

Nalin K Patel

Clare Foden

Valery Talyansky

Llewellyn John Cooper

A photon source, comprising a first semiconductor region having excess carriers with a first conductivity type, and a second semiconductor region having excess carriers with a second conductivity type, the first and second conductivity types being opposing conductivity types; means for creating a surface acoustic wave (SAW) travelling from the first semiconductor region to the second semiconductor region such that excess carriers from the first semiconductor region are carried by the wave to the second region and quantizing means for quantizing the carrier transport caused by the wave, such that the number of carriers introduced into the second semiconductor region can be controlled to the accuracy of a single carrier.

Photon source

A semiconductor device is presented which exhibits both interband and intraband tunnelling. The device comprises two active layers (21, 23) which are sandwiched between two barrier layers (3, 5). These layers are located between first and second terminals (7, 9). The active layers (21, 23) are chosen such that the conduction band edge (27) of the first active layer (21) having a lower energy than the valence band edge (25) of the second active layer (23);

Semiconductor device

A semiconductor device comprises mutually separated first and third barrier layers interposed between the first and second patterned terminals. The device operates by the resonant tunneling of carriers from the second terminal to the first terminal. The first terminal is patterned into a section and a plurality of layers comprising the mutually separated first and second barrier layers are formed on top of the first terminal. A second terminal is then formed on top of the plurality of semiconductor layers. The second terminal is then patterned so that it only overlies the first terminal in confined region. A front-gate is then formed on top of the patterned second terminal.

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Cambridge, United Kingdom

Mark Levence Leadbeater