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Nano guitar string plays by itself

22.10.2019

Scientists from Lancaster University and Oxford University (UK) have created a "nano-string" that vibrates without any external influence. A tiny wire, resembling a guitar string, can be driven directly by an electric current.

To create the device, the researchers took a carbon nanotube, which is a wire about three nanometers in diameter, about 100 times thinner than a guitar string. They attached the "string" to metal supports at each end and then cooled it down to 000 degrees above absolute zero, which is -0,02°C. The central part of the wire was free to vibrate, which the researchers could detect by running a current through the wire and measuring the change in electrical resistance.

Just as a guitar string vibrates when it is plucked, a wire vibrates when electrical voltage is applied to it. Surprisingly, when they repeated the experiment without external forces, the wire also began to move. The "nano-guitar" string played by itself.

So what note does the nano guitar play? A nanotube is much thinner than a guitar string, so it vibrates at a much higher frequency - within the ultrasonic range. So no one can hear it. But you can still assign a "note" to this sound. Its frequency is 231 million hertz, which means it is an A (A) string 21 octaves above standard tuning.

Such a nanostring could be used to amplify tiny forces, such as in new microscopes, or to measure the viscosity of exotic quantum liquids.

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