Magnetic-Field-Induced Crossover to a Nonuniversal Regime in a Kondo Dot

Details Magnetic-Field-Induced Crossover to a Nonuniversal Regime in a Kondo Dot Magnetic-Field-Induced Crossover to a Nonuniversal Regime in a Kondo Dot

2009-10-16

arxiv.org/abs/0910.3180v1

Phys. Rev. Lett. 103, 026803 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.103.026803

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 the parameter space: varying the dot-lead coupling at a constant dot energy, and vice versa. At a high magnetic field, $B$, the changes of $\Delta_K$ with $T_K$ along the two paths have opposite signs, indicating that $\Delta_K$ is not a universal function of $T_K$. At low $B$, we observe a decrease in $\Delta_K$ with $T_K$ 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.

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