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The candle is extinguished with a glance. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

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Focus Description:

The magician puts the candle on the table and lights it. With the words: "I can extinguish a candle with a glance!" moves away a considerable distance, closes his eyes for a moment, as if transmitting energy. After a few moments, the candle will go out on its own.

Focus secret:

Candle real, paraffin. It goes out because of the silicate glue, a few drops of which are pre-applied into a tiny hole on its surface, at the very base of the centimeter wick. The length of the wick makes it possible to calmly move away from the candle and give the appropriate command from there.

To lengthen the wick to the desired size, use a knife to cut off excess paraffin from the top of the candle.

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Stable two-dimensional electron gas on the surface of a semiconductor 06.03.2014

For the first time, German physicists were able to turn a fragment of a semiconductor into a special structure, on the surface of which there is a "two-dimensional electron gas" - a set of electrons that can move along two axes and are rigidly "fixed" on the third axis.

Some materials are capable of limiting how electrons move within them when exposed to an external force. For example, when an external electric field appears inside special semiconductors, a special zone, a "two-dimensional electron gas" (XNUMXDEG), often appears. The unusual properties of electrons in this zone could help us create high-temperature superconductors, exotic nanoelectronics, or new ways of transmitting information.

Ulrika Diebold from the Vienna University of Technology (Austria) and her colleagues took a step towards creating such devices by studying the properties of crystals from strontium titanate, a semiconductor consisting of titanium, strontium and oxygen atoms. This substance, together with another compound, lanthanum aluminate, has already been used to study the properties of DEG, which appears at the interface between their plates.

The authors of the article noticed that the manner in which electrons move on the surface of strontium titanate crystals can vary greatly depending on which atoms are located on the border with air. Physicists implemented this idea in the form of a model and calculated such a variant of the structure of strontium, oxygen and titanium atoms, on the surface of which a two-dimensional electron gas should appear.

Diebold and her colleagues made it a reality by treating a strontium titanate crystal with a laser that removed "unnecessary" atoms from its surface. The experiment ended successfully - the scientists obtained a stable DEG on the surface of the crystal, the properties of which coincide with the theoretical calculations. Physicists believe that further study of such crystals will help to understand whether we can use all the potential advantages of DEG in technology and science.

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