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

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 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.

arXiv comment12 pages, 5 figures

References in corpus (12)

• Kondo Physics in a Single Electron Transistor
• A Tunable Kondo Effect in Quantum Dots
• Low Temperature Transport through a Quantum Dot: The Anderson Model out of Equilibrium
• From the Kondo Regime to the Mixed-Valence Regime in a Single-Electron Transistor
• Kondo effect in a magnetic field and the magnetoresistivity of Kondo alloys
• Universal Scaling in Non-equilibrium Transport Through a Single-Channel Kondo Dot
• Measurements of Kondo and spin splitting in single-electron transistors
• Anomalous magnetic splitting of the Kondo resonance
• Nonequilibrium Transport through a Kondo Dot in a Magnetic Field: Perturbation Theory
• Kondo physics in tunable semiconductor nanowire quantum dots
• Field-dependent dynamics of the Anderson impurity model
• Kondo-temperature dependence of the Kondo splitting in a single-electron transistor

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• Nonequilibrium Zeeman-splitting in quantum transport through nanoscale junctions
• Magnetic Field Universality of the Kondo Effect Revealed by Thermocurrent Spectroscopy
• Quantitative determination of the discretization and truncation errors in the numerical renormalization-group calculations of spectral functions
• Magnetic field effects in few-level quantum dots: theory, and application to experiment
• Out of equilibrium transport through an Anderson impurity: Probing scaling laws within the equation of motion approach
• Dynamic response of a spin-1/2 Kondo singlet
• Scaling of conductance through quantum dots with magnetic field
• The scaling feature of the magnetic field induced Kondo-peak splittings
• Magnetic field induced mixed-level Kondo effect in two-level systems
• A quantitative study of spin-flip co-tunneling transport in a quantum dot
• Magnetic Splitting of the Zero Bias Peak in a Quantum Point Contact with a Variable Aspect Ratio