Zeeman smearing of the Coulomb blockade

Details Zeeman smearing of the Coulomb blockade Zeeman smearing of the Coulomb blockade

2001-01-10

arxiv.org/abs/cond-mat/0101126v3

Phys. Rev. B 64, R161302 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures (Final version)

Scientific paper

10.1103/PhysRevB.64.161302

Charge fluctuations of a large quantum dot coupled to a two-dimensional lead via a single-mode good Quantum Point Contact (QPC) and capacitively coupled to a back-gate, are investigated in the presence of a parallel magnetic field. The Zeeman term induces an asymmetry between transmission probabilities for the spin-up and spin-down channels at the QPC, producing noticeable effects on the quantization of the grain charge already at low magnetic fields. Performing a quantitative analysis, I show that the capacitance between the gate and the lead exhibits - instead of a logarithmic singularity - a reduced peak as a function of gate voltage. Experimental applicability is discussed.

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