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Chin. Phys. B, 2014, Vol. 23(5): 057302    DOI: 10.1088/1674-1056/23/5/057302

Phonon-dependent transport through a serially coupled double quantum dot system

M. Bagheri Tagani, H. Rahimpour Soleimani
Department of Physics, University of Guilan, P. O. Box 41335-1914, Rasht, Iran
Abstract  Using Keldysh nonequilibrium Green function formalism and mapping a many-body electron-phonon interaction onto a one body problem, the electron transport through a serially coupled double quantum dot system is analyzed. The influence of the electron-phonon interaction, temperature, detuning, and interdot tunneling on the transmission coefficient and current is studied. Our results show that the electron-phonon interaction results in the appearance of the side peaks in the transmission coefficient, whose height is strongly dependent on the phonon temperature. We have also found that the inequality of the electron-phonon interaction strength in two dots gives rise to an asymmetry in the current-voltage characteristic. In addition, the temperature difference between the phonon and electron subsystems results in the reduction of the saturated current and the destruction of the step-like behavior of the current. It is also observed that the detuning can improve the magnitude of the current by compensating the mismatch of the quantum dots energy levels induced by the electron-phonon interaction.
Keywords:  quantum dot      electron-phonon interaction      Keldysh nonequilibrium Green function formalism      current-voltage characteristic  
Received:  14 October 2013      Revised:  28 November 2013      Accepted manuscript online: 
PACS:  73.23.Hk (Coulomb blockade; single-electron tunneling)  
  73.63.Kv (Quantum dots)  
Corresponding Authors:  H. Rahimpour Soleimani     E-mail:
About author:  73.23.Hk; 73.63.Kv

Cite this article: 

M. Bagheri Tagani, H. Rahimpour Soleimani Phonon-dependent transport through a serially coupled double quantum dot system 2014 Chin. Phys. B 23 057302

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