it reads like there is a bit more 'mystery', or 'the yet explained', explained(o): > measuring current vs voltage in a new way, by applying brief voltage pulse

it reads like there is a bit more 'mystery', or 'the yet explained', explained(o): > measuring current vs voltage in a new way, by applying brief voltage pulses to the STM tip. When the pulses lasted 10 microseconds or longer, they saw NDR. But when they reduced the pulse length to 10 nanoseconds, the effect disappeared. ... Combining this information with other data, the team determined the timescale for electrons refilling the empty lower level. unreal (o) https://physics.aps.org/articles/v9/155 https://physics.aps.org/articles/v9/155