Comment on “2-channel Kondo scaling in conductance signals from 2-level tunneling systems” Academic Article uri icon


  • In a recent Letter [1],Ralph et al. attribute the zero-bias anomaly of a Cu point contact [2] to the scattering of elec- trons by two-level systems (TLS) acting as two-channel Kondo impurities. In this Comment we (1) point out a se- rious difficulty with the two-channel Kondo interpretation, and (2) propose an alternative explanation of the data. The anomaly observed in thepoint-contact experiments [1,2] is adip in the differential conductance around zero bias. While the two-channel Kondo model isvery success- ful in accountingfor the scaling form …

publication date

  • July 24, 1995