利用光控制量子隧穿效应
文章来源:未知 文章作者:enread 发布时间:2012-04-06 05:08 字体: [ ]  进入论坛
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Scientists at the Cavendish Laboratory in Cambridge have used light to help push electrons through a classically impenetrable barrier. While quantum tunnelling(隧道) is at the heart of the peculiar1(特殊的) wave nature of particles, this is the first time that it has been controlled by light. Their research is published 05 April, in the journal Science.

Particles cannot normally pass through walls, but if they are small enough quantum mechanics says that it can happen. This occurs during the production of radioactive decay and in many chemical reactions as well as in scanning tunnelling microscopes.

According to team leader, Professor Jeremy Baumberg, "the trick to telling electrons how to pass through walls, is to now marry them with light."

This marriage is fated because the light is in the form of cavity(洞) photons, packets of light trapped to bounce back and forth2 between mirrors which sandwich the electrons oscillating through their wall.

Research scientist Peter Cristofolini added: "The offspring of this marriage are actually new indivisible particles, made of both light and matter, which disappear through the slab-like walls of semiconductor3 at will."

One of the features of these new particles, which the team christened 'dipolaritons', is that they are stretched out in a specific direction rather like a bar magnet. And just like magnets, they feel extremely strong forces between each other.

Such strongly interacting particles are behind a whole slew4 of recent interest from semiconductor physicists5 who are trying to make condensates(冷凝物) , the equivalent of superconductors and superfluids that travel without loss, in semiconductors6.

Being in two places at once, these new electronic particles hold the promise of transferring ideas from atomic physics into practical devices, using quantum mechanics visible to the eye.



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1 peculiar cinyo     
adj.古怪的,异常的;特殊的,特有的
参考例句:
  • He walks in a peculiar fashion.他走路的样子很奇特。
  • He looked at me with a very peculiar expression.他用一种很奇怪的表情看着我。
2 forth Hzdz2     
adv.向前;向外,往外
参考例句:
  • The wind moved the trees gently back and forth.风吹得树轻轻地来回摇晃。
  • He gave forth a series of works in rapid succession.他很快连续发表了一系列的作品。
3 semiconductor Uzuwq     
n.半导体
参考例句:
  • In the beginning,engineers hoped to use semiconductor lasers.在开始时,工程师们希望能够利用半导体激光器。
  • The main agent of the company brand semiconductor sales.本公司主要代理各品牌半导体销售。
4 slew 8TMz0     
v.(使)旋转;n.大量,许多
参考例句:
  • He slewed the car against the side of the building.他的车滑到了大楼的一侧,抵住了。
  • They dealt with a slew of other issues.他们处理了大量的其他问题。
5 physicists 18316b43c980524885c1a898ed1528b1     
物理学家( physicist的名词复数 )
参考例句:
  • For many particle physicists, however, it was a year of frustration. 对于许多粒子物理学家来说,这是受挫折的一年。 来自英汉非文学 - 科技
  • Physicists seek rules or patterns to provide a framework. 物理学家寻求用法则或图式来构成一个框架。
6 semiconductors 0e1983fea761e849266037e7a40cb125     
n.半导体( semiconductor的名词复数 )
参考例句:
  • Crystals may be insulators, semiconductors, or conductors. 晶体可以是绝缘体,半导体,或导体。 来自辞典例句
  • Semiconductors containing such impurities are called p-type semiconductors. 含有这类杂质的半导体叫做P型半导体。 来自辞典例句
TAG标签: light quantum tunnelling
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