Scanning gate imaging of two coupled quantum dots in single-walled carbon nanotubes

Two coupled single wall carbon nanotube quantum dots in a multiple quantum dot system were characterized by using a low temperature scanning gate microscopy (SGM) technique, at a temperature of 170 mK. The locations of single wall carbon nanotube quantum dots were identified by taking the conductanc...

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Bibliographic Details
Published in:Nanotechnology 2014-12, Vol.25 (49), p.495703-495703
Main Authors: Zhou, Xin, Hedberg, James, Miyahara, Yoichi, Grutter, Peter, Ishibashi, Koji
Format: Article
Language:English
Subjects:
Applied sciences
Capacitance
carbon nanotube quantum dots
Conductance
Coulomb blockade
Cross-disciplinary physics: materials science
rheology
Electronics
Exact sciences and technology
Gates
Joining
Materials science
Molecular electronics, nanoelectronics
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Nanotubes
Physics
Quantum dots
Scanning
scanning gate microscopy
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Single electrons
Single wall carbon nanotubes
single-electron tunneling
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Summary:Two coupled single wall carbon nanotube quantum dots in a multiple quantum dot system were characterized by using a low temperature scanning gate microscopy (SGM) technique, at a temperature of 170 mK. The locations of single wall carbon nanotube quantum dots were identified by taking the conductance images of a single wall carbon nanotube contacted by two metallic electrodes. The single electron transport through single wall carbon nanotube multiple quantum dots has been observed by varying either the position or voltage bias of a conductive atomic force microscopy tip. Clear hexagonal patterns were observed in the region of the conductance images where only two sets of overlapping conductance rings are visible. The values of coupling capacitance over the total capacitance of the two dots, have been extracted to be 0.21 ∼ 0.27 and 0.23 ∼ 0.28, respectively. In addition, the interdot coupling (conductance peak splitting) has also been confirmed in both conductance image measurement and current-voltage curves. The results show that a SGM technique enables spectroscopic investigation of coupled quantum dots even in the presence of unexpected multiple quantum dots.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/25/49/495703