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Effect of the number of quantum dots on transport properties of multiple quantum dot systems in T-shaped topology

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Abstract

We investigate the mesoscopic electron transport through multiple quantum dot systems in a T-shaped configuration and analyse the effect of the number of quantum dots on transport observables. Analytically, the expressions for the transmission probability and current have been derived, in the presence of intradot Coulomb interaction, using non-equilibrium Green function techniques. The higher-order Green functions containing the Coulomb interaction term have been decoupled using the mean-field approximation. The analytical, as well as the numerical, calculations have been presented for single, double and triple quantum dot systems in T-shaped configuration and then the results have been generalised for N number of quantum dots in the same configuration. The transport observables, such as transmission coefficient, I–V characteristics and differential conductance, have been numerically analysed. Numerical results show a systematic variation in the number of transmission spectrum peaks as the number of quantum dots side-coupled to the active dot increases. It is found that the number of the transmission probability peaks is directly related to the number of quantum dots and the peak spacings are controlled by the inter-dot coupling strength. However, the magnitude of the current is hardly affected by the increase in the number of side-coupled dots in T-shaped quantum dot systems.

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Authors and Affiliations

  1. University Institute of Technology, H.P. University, Shimla, 171 005, India

    Shyam Chand

  2. Department of Physics, RKMV Shimla, Shimla, 171 001, India

    Sushila Devi

  3. Department of Physics, Chandigarh University, Mohali, 140 413, India

    Neha Kondal

Authors
  1. Shyam Chand
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  2. Sushila Devi
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  3. Neha Kondal
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Correspondence to Shyam Chand.

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Chand, S., Devi, S. & Kondal, N. Effect of the number of quantum dots on transport properties of multiple quantum dot systems in T-shaped topology. Pramana - J Phys 97, 18 (2023). https://doi.org/10.1007/s12043-022-02494-w

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  • DOI: https://doi.org/10.1007/s12043-022-02494-w

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