Negative differential resistance due to the resonance coupling of a quantum-dot dimer

2003/05/01 by S. D. Wang, Zhe Sun, Z. Z. Sun +6
Engineering · Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Molecular Junctions and Nanostructures #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall

paper · pdf · doi:10.48550/arxiv.cond-mat/0305018

9 pages, 8 figures. It has been submitted to Journal of Physics: Condensed Matter

arxiv created 2003/05/01 · openalex publication_date 2003/05/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Electron tunneling through a coupled quantum-dot dimer under a dc-bias is investigated. We find that a peak in the I-V curve appears at low temperature when two discrete electronic states in the two quantum dots are aligned with each other -- resonance coupling. This leads to a negative differential resistance. The peak height and width depend on the dot-dot coupling. At high temperature, the peak disappears due to thermal smearing effects.

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