Sentences with phrase «quantum wells»

These two then knock another two out from the second quantum well.

So that's the setup: You want electrons to localize in quantum wells in the presence of holes to emit light.

They were partly inspired by studies on the confinement of electrons in tiny structures within semiconductors called quantum wells, quantum wires and quantum dots («How to build better lasers», New Scientist, 11 January).

A quantum dot laser is similar in design, but the sheets of quantum well materials are replaced with a high density of smaller dots, each a few nanometers high and tens of nanometers across.

These thin layers are known as quantum wells.

People have studied this in artificial semiconductor quantum wells in the very far - infrared wavelength range, but this is the first time it has been observed in a naturally occurring low - dimensional material and at such a short wavelength.»

And because of their small size,» Liu added, «they require less power to operate than quantum well lasers while outputting more light, so they would enable low - cost silicon photonics.»

When the freed electron arrives at the first quantum well, it knocks another out into the conduction band.

They have built a prototype APD with a multiple quantum well made of layers of gallium arsenide and aluminium gallium arsenide.

«These materials are quantum hybrid materials, possessing physical properties of both organic semiconductors and inorganic semiconducting quantum wells.

The lab used the light to probe the shift in an ultra-high quality, two - dimensional electron gas supplied by Purdue University physicist Michael Manfra and set in a gallium arsenide quantum well (to contain the particles) under the influence of a strong magnetic field and low temperature.

Home > Press > Plasmons triggered in nanotube quantum wells: Rice, Tokyo Metropolitan scientists create platform for unique near - infrared devices

Each quantum dot consists of coupled spherical quantum wells, each in turn containing a single electron spin.

The heterostructures used in the new device essentially create an electron attractive force that the researchers have used to construct quantum wells to control the movement of electrons and make the device emit light.

The researchers engineered their transistor's base with microscopic pockets called quantum wells, which trap the electrons and release them as laser light.

The heart of the device is a microscopic sandwich of quantum wells — crystalline films of semiconductors only a few billionths of a meter thick, each with a different electrical conductivity.

The width of the nanotubes trapped the electrons in quantum wells, in which the energy of atoms and subatomic particles is «confined» to certain states, or subbands.

When voltage is applied, electrons tunnel through the insulator layers with the help of a «quantum well» that forms between the two insulators.

Currently, so - called «quantum well» lasers are used for data transmission.

They consist of nanometers - thick layers of light - emitting material, representing the quantum well, sandwiched between other materials that serve to guide both the injected electrical current as well as the output light.

Victor Klimov and colleagues at Los Alamos National Laboratory assembled their cadmium selenide dots on top of a so - called quantum well, a thin sheet of semiconductor sandwiched between two barrier layers.

While constructing it, they doped the quantum well layers with precise quantities of impurities.

Semiconductor lasers like those in CD players already exploit quantum mechanics by trapping electrons in an atoms - thick layer called a quantum well.

The team set up a two - dimensional electron system known as a quantum well.

The effect, however, turns out to work only in LEDs which use nanometre - thick active regions — quantum wells.

Merlin and his team created a semiconductor «quantum well,» doped it with impurities that gave off free electrons, then placed it within a magnetic field.

These thin interior layers are evocatively called a «quantum well» — when electrons fall in, they localize at lower energy levels.

In effect, these quantum wells (where electrons and «holes» both see a lower energy in the «well» layer, hence the name) use their special properties for the confinement of charge carriers (the electrons and holes) in thin layers at a quantum level.