Transport properties of carbon nanotube<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="normal">C</mml:mi><mml:mn>60</mml:mn></mml:msub></mml:math>peapods

Quay, C. H. L.; Cumings, John; Gamble, Sarah; Yazdani, Ali; Kataura, Hiromichi; Goldhaber‐Gordon, David

doi:10.1103/physrevb.76.073404

Cited by 41 publications

(87 citation statements)

References 21 publications

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“…In contrast to Refs. 10,11 and to similar measurements on empty CNT quantum dots, we observe a systematic repetition of avoided crossings in a gate-range corresponding to some 400 consecutive charge-states. This systematic feature results from a weak hybridization with a weakly gated localized orbital, as detailed comparisons with master equation calculations show.…”

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confidence: 82%

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Transport via coupled states in aC60peapod quantum dot

et al. 2010

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We have measured systematic repetitions of avoided crossings in low temperature three-terminal transport through a carbon nanotube with encapsulated C60 molecules. We show that this is a general effect of the hybridization of a host quantum dot with an impurity. The well-defined nanotube allows identification of the properties of the impurity, which we suggest to be a chain of C60 molecules inside the nanotube. This electronic coupling between the two subsystems opens the interesting and potentially useful possibility of contacting the encapsulated molecules via the tube.PACS numbers: 73.61.Wp, 73.63.Fg, 71.10.Pm Peapod systems represent a next step in complexity of carbon-based electronics, departing from the wellcharacterized single-walled nanotube system. Since the advent 1 of these single-walled carbon nanotubes (CNTs) filled with C 60 molecules (or other fullerenes), there has been an ongoing experimental effort to clarify the modification of the electronic properties of the CNT. In particular, the hybridization of the C 60 molecules with the CNT electronic states is of importance for addressing the molecular scale "peas" via the CNT, for instance using spin-exchange processes. More generally, the interaction of quantum dot systems of different nature and the associated transport signatures are of broad interest. Band structure calculations 2-7 have suggested that the hybridization between the CNT and the encapsulated C 60 molecules could lead to an extra band crossing the Fermi-level in a metallic peapod, depending on tubechirality, but the experimental evidence for such mixing between the two subsystems remains ambiguous.Since the first transmission electron microscopy images of the encapsulated molecules 1 , scanning tunneling microscopy (STM) has been used to probe the electronic states of a single peapod, showing that they were indeed different from those of an empty CNT 8 . These STMdata of Hornbaker et al.8 were rationalized in terms of a semi-empirical model invoking a coupling between the CNT π-orbitals and the t 1u states of a C 60 of the order of 1.25 eV, indicative of substantial hybridization of the two subsystems. DFT-results of Lu et al.4 predicted one order of magnitude smaller hybridization. Subsequent photoemission studies 9 even showed no evidence for hybridization between C 60 molecules and tube.Also low-temperature transport measurements of peapods prepared as three-terminal quantum dots have been performed 10-13 , but the results remain inconclusive. Refs.10,11 find no evidence for electronic structures deviating from that of empty CNT quantum dots, whereas Refs.12,13 showed irregular diamond-structures which were suggested to derive from the encapsulated C 60 system. Since, at present, simultaneous imaging and transport measurements are not possible, these experiments may have probed peapods with rather different electronic structure. For a consistent picture to emerge, more experiments on high-quality peapod samples are clearly necessary. Thus the question still remains whether t...

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confidence: 82%

“…Also low-temperature transport measurements of peapods prepared as three-terminal quantum dots have been performed [10][11][12][13] , but the results remain inconclusive. Refs.…”

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confidence: 99%

Transport via coupled states in aC60peapod quantum dot

et al. 2010

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“…These findings are consistent with recent transport experiments on nanotubes with encapsulated C 60 molecules [15,16] as well as with recent density functional theory calculations of spin interactions of chains of Sc@C 82 inside carbon nanotubes…”

Section: Nanotube Devicessupporting

confidence: 92%

Pauli spin blockade in carbon nanotube double quantum dots

et al. 2008

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We report Pauli spin blockade in an impurity defined carbon nanotube double quantum dot. We observe a pronounced current suppression for negative source-drain bias voltages which is investigated for both symmetric and asymmetric coupling of the quantum dots to the leads. The measured differential conductance agrees well with a theoretical model of a double quantum dot system in the spin-blockade regime which allows us to estimate the occupation probabilities of the relevant singlet and triplet states. This work shows that effective spin-to-charge conversion in nanotube quantum dots is feasible and opens the possibility of single-spin readout in a material that is not limited by hyperfine interaction with nuclear spins.

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“…Many experiments have been performed to understand the effect of encapsulated C 60 molecules on the electronic transport properties of SWNTs [4][5][6][7][8][9][10]. A scanning tunneling microscope experiment [4] demonstrated that the encapsulated C 60 molecules changed the local electronic structure of semiconducting SWNTs.…”

Section: Introductionmentioning

confidence: 99%

Fullerene peapods: In-situ conductivity study during synthesis

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Kim

Uhm

et al. 2014

Journal of the Korean Physical Society

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We report in-situ measurement of the conductivity during the synthesis of C60-filled single-walled carbon nanotubes (SWNTs), so-called fullerene peapods. The synthesis was performed in a sealed quartz tube at 773 K by using the sublimation of C60 into the hollow space of the SWNTs. The change in the resistance in the SWNT buckypaper was monitored during the C60-filling process, and the temperature dependence of the resistance was compared to that for empty SWNTs and fullerene peapods. The SWNT networks became more metallic due to the encapsulation of C60, and a reduced temperature dependence of the resistivity was observed in the peapods, with an overall decrease in the resistivity. The interaction between the SWNT and C60 molecules, changing the electronic properties of SWNTs, can provide a way to functionalize the SWNTs.

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Transport properties of carbon nanotubeC60peapods

Cited by 41 publications

References 21 publications

Transport via coupled states in aC60peapod quantum dot

Transport via coupled states in aC60peapod quantum dot

Pauli spin blockade in carbon nanotube double quantum dots

Fullerene peapods: In-situ conductivity study during synthesis

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