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Transport Through a Quantum Dot with Coulombic Dot-Lead Coupling

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Abstract

We investigate joint effects of the Coulombic dot-lead interaction and intralead electron interaction on current through a quantum dot weakly coupled to Luttinger liquid leads. A general formula of current is derived by applying the canonical transformation and the nonequilibrium Green function technique. At low temperature and weak intralead interaction, the current exhibits staircase behavior with the Coulombic dot-lead interaction. When temperature or the intralead interaction increases, the steps are rounded. For a weak or moderately strong interaction the differential conductance as a function of bias voltage demonstrates resonant behavior. The dot-lead exchange scattering processes can dominate electron transport for a certain region of interaction strength. This result implies the possibility of controlling the differential conductance of the transistor by tuning the Coulombic dot-lead coupling.

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Acknowledgements

This work is supported by the Beijing Novel Program (2005B11), by Beijing Natural Science Foundation (1112003) and Fund of Beijing Municipal Education Commission (006000546312503).

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Authors and Affiliations

  1. College of Applied Sciences, Beijing University of Technology, Beijing, 100124, China

    Kai-Hua Yang, Yang Chen & Bei-Yun Liu

  2. Department of Physics, Tsinghua University, Beijing, 100084, China

    Huai-Yu Wang

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  1. Kai-Hua Yang
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  2. Yang Chen
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  3. Huai-Yu Wang
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  4. Bei-Yun Liu
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Correspondence to Kai-Hua Yang.

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Yang, KH., Chen, Y., Wang, HY. et al. Transport Through a Quantum Dot with Coulombic Dot-Lead Coupling. J Low Temp Phys 170, 116–130 (2013). https://doi.org/10.1007/s10909-012-0672-x

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