Two quantum dots are better than one: Using one dot to sense changes in another

ScienceDaily | 9/19/2018 | Staff
yana.booyana.boo (Posted by) Level 4
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The device was fabricated using two indium arsenide (InAs) quantum dots connected to electrodes that were deliberately narrowed to minimize the undesirable screening effect.

"The two quantum dots in the device showed significant capacitive coupling," says Haruki Kiyama. "As a result, the single-electron charging of one dot was detected as a change in the current of the other dot."

Response - Sensor - Quantum - Dot - Number

The current response of the sensor quantum dot depended on the number of electrons in the target dot. Hence the device can be used for real-time detection of single-electron tunneling in a quantum dot. The tunneling events of single electrons in and out of the target quantum dot were detected as switching between high and low current...
(Excerpt) Read more at: ScienceDaily
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