At the junction where the two materials meet, electrons pair up with holes to form an area depleted of charge that prevents current from flowing.

两种材料的接合处电子与电穴配对形成一个没有电荷的区域，阻止电流通过。

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When a current is applied across the sandwich, the electrons and holes team up at the junction of the two materials and release energy in the form of light.

电流流过夹层，电子和空穴在两种材料接口处共同发挥作用，释放光能。

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The electrical current transports the atom from one end of the wire to the other, so the wire on one end can have holes or at the other end can be broken.

电流把原子从导线的一端输送到另一端，就会在导线一端造成空洞或在另一端把导线撑破。

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This finding is at odds with the current thinking about how supermassive black holes form at the center of new galaxies, which makes it of particular interest to astronomers.

FORBES: Astronomers Find One Of The Biggest Supermassive Black Holes Yet

When a current is applied across the sandwich, the electrons and holes team up at the junction of the two materials and release energy in the form of light.

ECONOMIST: Lighting: A brilliant new approach | The

"We often think of black holes pulling in matter, but actually what we observe with our current instrumentation is matter flying out, " said Timothy Kallman of NASA's Goddard Space Flight Center in Greenbelt, Maryland, in a statement.

CNN: Black holes in a new light