Tunnelling magnetoresistance anomalies of a Coulomb blockaded quantum dot

Details Tunnelling magnetoresistance anomalies of a Coulomb blockaded quantum dot Tunnelling magnetoresistance anomalies of a Coulomb blockaded quantum dot

2008-12-05

arxiv.org/abs/0812.1109v2

Phys. Rev. B 79, 085312 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 7 figures, Revtex style, to appaear in Phys. Rev. B extended discussion added, some typographic errors corrected

Scientific paper

10.1103/PhysRevB.79.085312

We consider quantum transport and tunneling magnetoresistance (TMR) through an interacting quantum dot in the Coulomb blockade regime, attached to ferromagnetic leads. We show that there exist two kinds of anomalies of TMR, which have different origin. One type, associated with TMR sign change and appearing at conductance resonances, is of single particle origin. The second type, inducing a pronounced increase of TMR value far beyond 100%, is caused by electron correlations. It is manifested in-between Coulomb blockade conductance peaks. Both types of anomalies are discussed for zero and finite bias and their robustness to the temperature increase is also demonstrated. The results are presented in the context of recent experiments on semiconductor quantum dots in which similar features of TMR have been observed.

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