quantum dot

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quantum dot

[‚kwänt·əm ′dät]
(electronics)
A quantized electronic structure in which electrons are confined with respect to motion in all three dimensions.

quantum dot

(physics)
(Or "single-electron transistor") A location capable of containing a single electrical charge; i.e., a single electron of Coulomb charge. Physically, quantum dots are nanometer-size semiconductor structures in which the presence or absence of a quantum electron can be used to store information.

See also: quantum cell, quantum cell wire, quantum-dot cellular automata.

http://www-mtl.mit.edu/MTL/bulletin/v6n2/Kumar.html.

["Quantum Dot Heterostructures", D. Bimberg, et al, John Wiley & Sons Ltd., Dec 1998].

quantum dot

A minuscule crystal of semiconductor material composed of various compounds of chemicals such as cadmium, zinc, tellurium, selenium and sulfur. Less than 500 nanometers in size, these "nanoparticles" react to light, as well as electricity, and emit their own light across the visible range of wavelengths from 470 to 730 nm.

The applications for quantum dots include medical sensors and lighting systems that are "painted" onto materials. Thin film deposits of quantum dots on solar cell substrates can increase their voltage output by fluorescing the light before it is captured. See QuantumFilm, quantum dot backlight and SUHD.
References in periodicals archive ?
When property previously placed in a QDOT becomes subject to estate taxes, it is taxed using the marginal estate tax rate of the deceased citizen spouse.
The entire value of the property in the QDOT at that time will be subject to federal estate tax;
Third, the decedent's executor must elect treatment as a QDOT.
If the surviving spouse does not intend to remain domiciled in the United States, a decision may be made to forgo a QDOT and pay the death taxes.
An election must also be made with respect to the QDOT on the decedents estate tax return when it is filed.
If the assets passing to the QDOT have a value in excess of $2 million (not including a personal residence with a value of up to $600,000), the QDOT must either have a U.
Before discussing some of the basic requirements, it must be remembered that the QDOT requirements only apply to a decedent's estate if the surviving spouse is a noncitizen.
The trust satisfies the requirements of the regulations to ensure the collection of any estate tax imposed on the QDOT.
Other than an IRC section 2056A(b)(3)(B) distribution on account of hardship, when distributions of QDOT "principal" would be made to the surviving noncitizen spouse, estate taxes would be due based upon the participant's estate tax marginal bracket; when the surviving spouse dies, the remaining QDOT principal would be subject to estate tax at the original participant's estate tax marginal tax bracket.
A major benefit of a QDOT is the ability to defer (rather than avoid) estate tax.
citizen, a QDOT trust arrangement is required, or the assets passing to the surviving spouse will not qualify for the marital deduction.
The final rules largely follow the proposed regulations issued in january 1993, except for the addition of QDOT qualification requirements proposed to ensure the connection of the Sec.