Singular conductance of a spin 1 quantum dot

Details Singular conductance of a spin 1 quantum dot Singular conductance of a spin 1 quantum dot

2004-09-30

arxiv.org/abs/cond-mat/0410001v2

Phys. Rev. Lett. 94, 036802 (2005).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Four pages, four figures. Paper revised with additional references added in response to feedback from readers

Scientific paper

10.1103/PhysRevLett.94.036802

We interpret the recent observation of a zero-bias anomaly in spin-1 quantum dots in terms of an underscreened Kondo effect. Although a spin-1 quantum dots are expected to undergo a two-stage quenching effect, in practice the log normal distribution of Kondo temperatures leads to a broad temperature region dominated by underscreened Kondo physics. General arguments, based on the asymptotic decoupling between the partially screened moment and the leads, predict a singular temperature and voltage dependence of the conductance $G$ and differential conductance $g$, resulting in $dg/dT\sim 1/T$ and $dG/dV \sim 1/V$. Using a Schwinger boson approach, we show how these qualitative expectations are borne out in a detailed many body calculation.

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