Transport measurements on carbon nanotubes structurally characterized by electron diffraction

Allen, Christopher S.; Elkin, Mark; Burnell, Gavin; Hickey, B. J.; Zhang, C.; Hofmann, Stephan; Robertson, John

doi:10.1103/physrevb.84.115444

Cited by 4 publications

(7 citation statements)

References 41 publications

(54 reference statements)

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“…A few experiments have combined transport measurements with structure determination by electron diffraction (Kociak et al, 2002;Allen et al, 2011). The structure can also be determined using optical Raman or Rayleigh spectroscopy, which is less invasive but does not always give unambiguous chiral indices (Cao et al, 2004;Huang et al, 2005;Deshpande et al, 2009).…”

Section: Basics Of Carbon Nanotube Devices a Structure Of Carbonmentioning

confidence: 99%

Quantum transport in carbon nanotubes

et al. 2015

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Carbon nanotubes are a versatile material in which many aspects of condensed matter physics come together. Recent discoveries have uncovered new phenomena that completely change our understanding of transport in these devices, especially the role of the spin and valley degrees of freedom. This review describes the modern understanding of transport through nanotube devices. Unlike in conventional semiconductors, electrons in nanotubes have two angular momentum quantum numbers, arising from spin and valley freedom. The interplay between the two is the focus of this review. The energy levels associated with each degree of freedom, and the spin-orbit coupling between them, are explained, together with their consequences for transport measurements through nanotube quantum dots. In double quantum dots, the combination of quantum numbers modifies the selection rules of Pauli blockade. This can be exploited to read out spin and valley qubits and to measure the decay of these states through coupling to nuclear spins and phonons. A second unique property of carbon nanotubes is that the combination of valley freedom and electron-electron interactions in one dimension strongly modifies their transport behavior. Interaction between electrons inside and outside a quantum dot is manifested in SU(4) Kondo behavior and level renormalization. Interaction within a dot leads to Wigner molecules and more complex correlated states. This review takes an experimental perspective informed by recent advances in theory. As well as the well-understood overall picture, open questions for the field are also clearly stated. These advances position nanotubes as a leading system for the study of spin and valley physics in one dimension where electronic disorder and hyperfine interaction can both be reduced to a low level.

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Section: Basics Of Carbon Nanotube Devices a Structure Of Carbonmentioning

confidence: 99%

Quantum transport in carbon nanotubes

et al. 2015

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“…The chirality of electrically contacted nanotubes is assigned by electron diffraction, (16,5)@ (20,12) as demonstrated by others [19][20][21]. However, here nanotubes are embedded in complex MEM actuators.…”

Section: Related Workmentioning

confidence: 67%

“…The nanotube integration is resist-free and electron-beam-induced contaminations [21] are avoided during assembly.…”

Section: Related Workmentioning

confidence: 99%

Suspended CNT-FET piezoresistive strain gauges: Chirality assignment and quantitative analysis

Muoth

Chikkadi

Liu

et al. 2013

2013 IEEE 26th International Conference on Micro Electro Mechanical Systems (MEMS)

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Carbon nanotubes can withstand large elastic deformation and show pronounced piezoresistive effects which make them promising candidates for low-power strain sensors in the large strain regime. Integration of individual suspended nanotubes into complex microelectromechanical devices, including gate structures, is still a challenge. Here, ultraclean carbon nanotubes spanning across actuated MEMS electrodes are operated as suspended Carbon Nanotube Field-Effect Transistors (CNT-FETs) under repeated variable strain up to 4.5%, thus acting as small-sized piezoresistive strain gauges whose gauge factor is electrostatically tuned by the gate. We present the first quantified electromechanical analysis of suspended CNT-FETs to uniaxial strain applied by on-chip micro actuators.

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“…Performing diffraction studies within a transmission electron microscope has become arguably by far the most powerful technique for the accurate determination of the chirality of individual SWCNTs, and ED methods are widely used to identify certain SWCNTs . For example, Jourdain and co‐workers observed the atomic structure of ultra‐long carbon nanotubes along the nanotube length via electron diffraction .…”

Section: Practical Examplesmentioning

confidence: 99%

Characterizing the Chiral Index of a Single‐Walled Carbon Nanotube

Zhao

Zhang

2014

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The properties of single-walled carbon nanotubes (SWCNTs) mainly depend on their geometry. However, there are still formidable difficulties to determine the chirality of SWCNTs accurately. In this review, some efficient methods to characterize the chiral indices of SWCNTs are illuminated. These methods are divided into imaging techniques and spectroscopy techniques. With these methods, diameter, helix angle, and energy states can be measured. Generally speaking, imaging techniques have a higher accuracy and universality, but are time-consuming with regard to the sample preparation and characterization. The spectroscopy techniques are very simple and fast in operation, but these techniques can be applied only to the particular structure of the sample. Here, the principles and operations of each method are introduced, and a comprehensive understanding of each technique, including their advantages and disadvantages, is given. Advanced applications of some methods are also discussed. The aim of this review is to help readers to choose methods with the appropriate accuracy and time complexity and, furthermore, to put forward an idea to find new methods for chirality characterization.

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Transport measurements on carbon nanotubes structurally characterized by electron diffraction

Cited by 4 publications

References 41 publications

Quantum transport in carbon nanotubes

Quantum transport in carbon nanotubes

Suspended CNT-FET piezoresistive strain gauges: Chirality assignment and quantitative analysis

Characterizing the Chiral Index of a Single‐Walled Carbon Nanotube

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