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Tunneling transport and spectroscopy in carbon nanotube quantum dots
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10.1063/1.3148035
/content/aip/journal/jcp/130/22/10.1063/1.3148035
http://aip.metastore.ingenta.com/content/aip/journal/jcp/130/22/10.1063/1.3148035
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the CNT quantum dot device, showing the and leads and the degenerate pair of CNT orbitals (tunnel couplings are omitted for clarity). The chemical potential of the lead is , with a net voltage drop of magnitude ; the relative partitioning of which between the leads is determined by .

Image of FIG. 2.
FIG. 2.

Coulomb blockade staircase in the -plane, from Eqs. (25)–(28), choosing the ratio for purposes of illustration. With a small lifetime broadening (thickened lines) included as discussed in text (Sec. III), the figure equivalently shows the zero-bias conductance arising from sequential electron tunneling, as a function of and .

Image of FIG. 3.
FIG. 3.

Coulomb blockade staircase in the -plane, from Eq. (33). With a small lifetime broadening (thickened lines) included as discussed in text (Sec. III), the figure equivalently shows the zero-bias conductance arising from sequential electron tunneling, as a function of and . Note the very different field scale to Fig. 2.

Image of FIG. 4.
FIG. 4.

Finite-bias equilibrium between the and ground states, in the -plane for (a) coupling to the -lead, (solid line) and (b) coupling instead to the -lead, (dashed line). A value of has been chosen [appropriate to experiment (Ref. 23), see Sec. ???].

Image of FIG. 5.
FIG. 5.

Conductance resonances in the -plane, in the vicinity of the border (shown for a field ). As well as the weak resonance at , addition and removal resonances arise at (addition for and removal for ), , and , denoted by in the figure. A value of has been chosen, appropriate to experiment (Ref. 23) (see text). With and taken from experiment as in text, the axis extends to .

Image of FIG. 6.
FIG. 6.

Conductance resonances in the -plane, in the vicinity of the border (shown for ). Here there are addition resonances (to the ground state), removal resonances (from the ground state), and the single resonance (denoted ) at on the degeneracy line. The resonances denoted , , and correspond to , and [as given from Eq. (48)]. A value of has again been chosen; and with and taken from experiment as in text, the axis extends to .

Image of FIG. 7.
FIG. 7.

Conductance resonances in the -plane, for a fixed in the vicinity of the border (cf. Fig. 6); showing the -dependence of the resonances , , , , and as given in text. With the experimental and (Ref. 23), the field . Agreement with the experimental conductance in the -plane [Fig. 2(c) of Ref. 23] is evident. Note that the vertical separation between the and resonances is for all , independent of ; enabling the proportionality constant between and [Eq. (46)] to be determined directly.

Image of FIG. 8.
FIG. 8.

Conductance resonances in the -plane, for a fixed in the vicinity of the border (cf. Fig. 6); showing the -dependence of the resonances , , , and as given in text. With and from experiment (Ref. 23), the field . Note that the vertical separation between the -resonance and the lowest energy resonance ( for and for ) is again the constant for all , independent of .

Image of FIG. 9.
FIG. 9.

(a) Conductance resonances in the -plane, in the vicinity of the border and for a fixed transverse field (cf. Fig. 5 for the parallel field case). In addition to the -resonance at , addition and removal resonances occur at (denoted , addition for and removal for ), and (addition resonance ). Shown for . (b) Corresponding conductance in the -plane (cf. Fig. 7 for a parallel field) for a constant . The resonances are given by Eq. (54). Note that the -scale extends up to . The vertical separation between the and resonances is again the constant for all .

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/content/aip/journal/jcp/130/22/10.1063/1.3148035
2009-06-11
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Tunneling transport and spectroscopy in carbon nanotube quantum dots
http://aip.metastore.ingenta.com/content/aip/journal/jcp/130/22/10.1063/1.3148035
10.1063/1.3148035
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