Observation of Kondo cloud-coupling in a mirror-symmetric carbon nanotube array-molybdenum structure (opens in new tab)

Magnetic impurities in a non-magnetic metal are screened by conduction electrons, forming a spin cloud known as a Kondo cloud. Experimental detection of this Kondo screening cloud in dilute magnetic alloys remains challenging. Here we show evidence of Kondo clouds and their coupling in devices composed of mirror-symmetric carbon nanotube arrays separated by a molybdenum strip. The Kondo effect in these devices depends sensitively on the width of the molybdenum strip. For widths of 0.3-1.2 mic...