Negative differential conductance and super-Poissonian shot noise in a single quantum dot coupled to two noncollinear polarized ferromagnetic leads

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• 作者：Hai-Bin Xue (1)
  Yi-Hang Nie (2)
  Wei Ren (3)
  
  1. College of Physics and Optoelectronics ; Taiyuan University of Technology ; Taiyuan ; 030024 ; P.R. China
  2. Institute of Theoretical Physics ; Shanxi University ; Taiyuan ; 030006 ; P.R. China
  3. International Centre for Quantum and Molecular Structures and Department of Physics ; Shanghai University ; 99 Shangda Road ; Shanghai ; 200444 ; P.R. China
  
• 关键词：Solid State and Materials
• 刊名：The European Physical Journal B - Condensed Matter
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：88
• 期：3
• 全文大小：707 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Physics
  Complexity
  Fluids
  Solid State Physics and Spectroscopy
  Superconductivity, Superfluidity and Quantum Fluids
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1434-6036

文摘

We have theoretically studied the full counting statistics of electron transport through a single quantum dot (QD) weakly coupled to two noncollinearly polarized ferromagnetic leads. We found a strong robust bias-voltage-tunable negative differential conductance (NDC) region, in which the shot noise is dramatically enhanced and reaches up to a super-Poissonian value. In particular, the formed super-Poissonian shot noise can still occur in a wide bias voltage region where only the singly-occupied electronic states entering the bias voltage window. The underlying mechanisms of the observed NDC and super-Poissonian shot noise originate from the quantum coherence between the two singly-occupied electronic states. In addition, the skewness in the NDC regime can be significantly increased up to a large positive value, which is also attributed to the quantum coherence of the QD system, and the variation of the skewness value is more sensitive to the quantum coherence than the shot noise. Our findings suggest a QD-based tunable NDC device, and the predicted properties of high-order current cumulants can provide a deeper understanding of electron transport through the single QD.