Non-equilibrium Differential Conductance through a Quantum Dot in a Magnetic Field

Details Non-equilibrium Differential Conductance through a Quantum Dot in a Magnetic Field Non-equilibrium Differential Conductance through a Quantum Dot in a Magnetic Field

2005-06-07

arxiv.org/abs/cond-mat/0506174v2

J. Phys.: Condens. Matter 17 (2005) 5413-5422

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 4 figures; Replaced by a fully revised version with minor corrections in the text

Scientific paper

10.1088/0953-8984/17/35/008

We derive an exact expression for the differential conductance for a quantum dot in an arbitrary magnetic field for small bias voltage. The derivation is based on the symmetric Anderson model using renormalized perturbation theory and is valid for all values of the on-site interaction $U$ including the Kondo regime. We calculate the critical magnetic field for the splitting of the Kondo resonance to be seen in the differential conductivity as function of bias voltage. Our calculations for small field show that the peak position of the component resonances in the differential conductance are reduced substantially from estimates using the equilibrium Green's function. We conclude that it is important to take the voltage dependence of the local retarded Green's function into account in interpreting experimental results

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