Transport across a carbon nanotube quantum dot contacted with ferromagnetic leads: Experiment and nonperturbative modeling
Transport across a carbon nanotube quantum dot contacted with ferromagnetic leads: Experiment and nonperturbative modeling
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DOI：
10.1103/physrevb.91.195402
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发表时间：
2015-05-06
影响因子：
3.7
通讯作者：
Strunk, Christoph
中科院分区：
文献类型：
--
作者：
Dirnaichner, Alois;Grifoni, Milena;Strunk, Christoph
我们目前的测量隧道磁电阻（TMR）在单壁碳纳米管连接到铁磁接触在库仑阻塞制度。强烈的变化的TMR与栅极电压在一个范围内的四个电导共振，包括一个奇特的双谷签名，观察。的数据进行了比较，计算在“穿着二阶”（DSO）的框架。在这种非微扰理论中，电导峰的位置和线宽的影响，结合碳纳米管量子点和铁磁引线的性质的电荷波动。该理论能够定性地再现实验数据。
We present measurements of tunneling magnetoresistance (TMR) in single-wall carbon nanotubes attached to ferromagnetic contacts in the Coulomb blockade regime. Strong variations of the TMR with gate voltage over a range of four conductance resonances, including a peculiar double-dip signature, are observed. The data are compared to calculations in the "dressed second order" (DSO) framework. In this nonperturbative theory, conductance peak positions and linewidths are affected by charge fluctuations incorporating the properties of the carbon nanotube quantum dot and the ferromagnetic leads. The theory is able to qualitatively reproduce the experimental data.