Affordable Access

Magnetic-field-induced crossover to a nonuniversal regime in a Kondo dot.

Authors
  • Liu, Tai-Min
  • Hemingway, Bryan
  • Kogan, Andrei
  • Herbert, Steven
  • Melloch, Michael
Type
Published Article
Journal
Physical review letters
Publication Date
Jul 10, 2009
Volume
103
Issue
2
Pages
26803–26803
Identifiers
PMID: 19659231
Source
Medline
License
Unknown

Abstract

We have measured the magnetic splitting Delta K of a Kondo peak in the differential conductance of a single-electron transistor while tuning the Kondo temperature T K along two different paths in parameter space: varying the dot-lead coupling at a constant dot energy and vice versa. At a high magnetic field B, the changes of DeltaK with TK along the two paths have opposite signs, indicating that Delta K is not a universal function of TK. At low B, we observe a decrease in DeltaK with TK along both paths, in agreement with theoretical predictions. Furthermore, we find Delta K/Delta<1 at low B and Delta K/Delta>1 at high B, where Delta is the Zeeman energy of the bare spin, in the same system.

Report this publication

Statistics

Seen <100 times