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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/52039

    Title: Bistability in the Tunnelling Current through a Ring of N Coupled Quantum Dots
    Authors: Shiau,SY;Chang,YC;Kuo,DMT
    Contributors: 電機工程學系
    Date: 2011
    Issue Date: 2012-03-28 10:13:55 (UTC+8)
    Publisher: 國立中央大學
    Abstract: We study bistability in the electron transport through a ring of N coupled quantum dots with two orbitals in each dot. One orbital is localized (called b orbital) and coupling of the b orbitals in any two dots is negligible; the other is delocalized in the plane of the ring (called d orbital), due to coupling of the d orbitals in the neighboring dots, as described by a tight-binding model. The d orbitals thereby form a band with finite width. The b and d orbitals are connected to the source and drain electrodes with a voltage bias V, allowing the electron tunnelling. Tunnelling current is calculated by using a nonequilibrium Green function method recently developed to treat nanostructures with multiple energy levels. We find a bistable effect in the tunnelling current as a function of bias V, when the size N greater than or similar to 50; this effect scales with the size N and becomes sizable at N similar to 100. The temperature effect on bistability is also discussed. In comparison, mean-field treatment tends to overestimate the bistable effect.
    Appears in Collections:[電機工程學系] 期刊論文

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