库仑阻塞量子点的隧穿磁电阻异常
Tunnelling magnetoresistance anomalies of a Coulomb blockaded quantum dot
摘要：
我们考虑了在库仑阻塞机制下，通过一个相互作用的量子点的量子输运和隧穿磁电阻（TMR）。我们指出，存在两种不同成因的TMR异常。一种类型，与TMR符号变化和出现在电导共振，是单粒子起源。第二类是由电子关联引起的，导致TMR值显著增加，远远超过100%。它表现在库仑阻塞电导峰之间。这两种类型的异常进行了讨论为零和有限的偏见和他们的鲁棒性的温度升高也证明了。结果的背景下，最近的半导体量子点，其中已观察到类似的功能TMR的实验。
英文摘要：
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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