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Resonant transport through graphene nanoribbon quantum dots
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View: Figures


Image of FIG. 1.
FIG. 1.

QDs made of armchair GNR junctions, denoted as (a) dot I, (b) dot II, and (c) dot III. The boxed region represents a primitive unit cell, and the lengths labeled by are measured by the number of unit cells. The widths, MD and Mc , are measured by the corresponding numbers of dimer lines across the width.

Image of FIG. 2.
FIG. 2.

(Color online) Conductance as a function of the Fermi energy in the quantum dot systems shown in Fig. 1. The three structures have 32, M 22, L 4, and L. The curves for dots II and III are displaced by and , respectively. Conductance peaks are labeled as . The numbers of propagating Bloch states for perfect 22-AGNRs and 32-AGNRs are shown for comparison.

Image of FIG. 3.
FIG. 3.

(Color online) LDOS at the energies of the conductance peaks shown in Fig. 2. Panels (a)–(f) correspond to the peaks a–f, respectively.The relative amplitude of the density at each lattice site is indicated by the radius of the ball.

Image of FIG. 4.
FIG. 4.

(Color online) Conductance vs energy for dot I. The parameters are: , , , and . The numbers of propagating states of 32-AGNR (dashed line) and 22-AGNR (dotted line) are also plotted for comparison.

Image of FIG. 5.
FIG. 5.

(Color online) Local density of states of unit cells along the transport direction at the resonance energies in Fig. 4.

Image of FIG. 6.
FIG. 6.

Conductance spectra of dot I with different geometric sizes. The curves are displaced by . Curve-1 has , , , and . The other curves have the same parameters as curve-1, except that curve-2 has , curve-3 has , and curve-4 has .

Image of FIG. 7.
FIG. 7.

(Color online) Disorder averaged (a) conductance and (b) Fano factor of dot I in the presence of edge disorder. The conductance of the clean lattice is also shown for comparison. The parameters are: , , , and .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Resonant transport through graphene nanoribbon quantum dots