Nano Archive

Self-aligned charge read-out for InAs nanowire quantum dots

Shorubalko, Ivan and Leturcq, Renaud and Pfund, Andreas and Tyndall, David and Krischek, Roland and Schton, Silke and Ensslin, Klaus (2008) Self-aligned charge read-out for InAs nanowire quantum dots. NANO LETTERS, 8 (2). pp. 382-385.

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A highly sensitive charge detector is realized for a quantum. dot in an InAs nanowire. We have developed a self-aligned etching process to fabricate in a single step a quantum point contact in a two-dimensional electron gas and a quantum dot in an InAs nanowire. The quantum dot is strongly coupled to the underlying point contact that is used as a charge detector. The addition of one electron to the quantum dot leads to a change of the conductance of the charge detector by typically 20%. The charge sensitivity of the detector is used to measure Coulomb diamonds as well as charging events outside the dot. Charge stability diagrams measured by transport through the quantum dot and charge detection merge perfectly.

Item Type:Article
Uncontrolled Keywords:Two-dimensional electron gas ; Point contacts ; Etching ; Quantum dots ; Nanostructured materials ; Nanowires ; Charged particle detection ; III-V semiconductors ; Indium arsenides ;
Subjects:Material Science > Nanofabrication processes and tools
Physical Science > Nanoelectronics
ID Code:456
Deposited By:Farnush Anwar
Deposited On:03 Dec 2008 14:53
Last Modified:03 Dec 2008 14:53

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