Abstract
Besides the usual conductance plateaus at multiples of , quantum point contacts typically show an extra plateau at , believed to arise from electron-electron interactions that prohibit the two spin channels from being simultaneously occupied. We present evidence that the disappearance of the 0.7 structure at very low temperature signals the formation of a Kondo-like correlated spin state. Evidence includes a zero-bias conductance peak that splits in a parallel field, scaling of conductance to a modified Kondo form, and consistency between peak width and the Kondo temperature.
- Received 31 January 2002
DOI:https://doi.org/10.1103/PhysRevLett.88.226805
©2002 American Physical Society