Understanding STM Microscopes: The Role of Voltage in Physics

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when physicists say that they apply voltage to the tip or the sample, do they mean that the tip or sample become electrically charged?
 
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Nav said:
when physicists say that they apply voltage to the tip or the sample, do they mean that the tip or sample become electrically charged?

Can you post links to the reading you've been doing about Scanning Tunneling Microscopes?
 

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