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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Cheng, Shun-JenSubject: search.filters.subject.quantum transport

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    Finger-gate manipulated quantum transport in Dirac materials
    (2015-05-27)
    Kleftogiannis, Ioannis
    ;
    Tang, Chi-Shung
    ;
    Cheng, Shun-Jen
    ;
    電子物理學系
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    Department of Electrophysics
    We investigate the quantum transport properties of multichannel nanoribbons made of materials described by the Dirac equation, under an in-plane magnetic field. In the low energy regime, positive and negative finger-gate potentials allow the electrons to make intra-subband transitions via hole-like or electron-like quasibound states (QBS), respectively, resulting in dips in the conductance. In the high energy regime, double dip structures in the conductance are found, attributed to spin-flip or spin-nonflip inter-subband transitions through the QBSs. Inverting the finger-gate polarity offers the possibility to manipulate the spin polarized electronic transport to achieve a controlled spin-switch.
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    Double-finger-gate controlled spin-resolved resonant quantum transport in the presence of a Rashba-Zeeman gap
    (2015-03-04)
    Tang, Chi-Shung
    ;
    Tseng, Shu-Ting
    ;
    Gudmundsson, Vidar
    ;
    Cheng, Shun-Jen
    ;
    電子物理學系
    We investigate double finger gate (DFG) controlled spin-resolved resonant transport properties in an n-type quantum channel with a Rashba-Zeeman (RZ) subband energy gap. By appropriately tuning the DFG in the strong Rashba coupling regime, resonant state structures in conductance can be found that are sensitive to the length of the DFG system. Furthermore, a hole-like bound state feature below the RZ gap and an electron-like quasi-bound state feature at the threshold of the upper spin branch can be found that is insensitive to the length of the DFG system.