Quantum point contact with large subband energy spacings

Quantum point contact (QPC) with an extra metallic gate in between the split gates of a conventional QPC was fabricated and studied. Clear conductance quantization was observed at 4.2K when a proper positive voltage was set to the middle gate of the QPC. The maximum energy spacing between the ground...

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Bibliographic Details
Published in:Applied physics letters 2012-04, Vol.100 (18), p.183502-183502-3
Main Authors: Um, Y. J., Oh, Y. H., Seo, M., Lee, S., Chung, Y., Kim, N., Umansky, V., Mahalu, D.
Format: Article
Language:English
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Summary:Quantum point contact (QPC) with an extra metallic gate in between the split gates of a conventional QPC was fabricated and studied. Clear conductance quantization was observed at 4.2K when a proper positive voltage was set to the middle gate of the QPC. The maximum energy spacing between the ground and the first exited state of the QPC was around 7meV which is at least a few times larger than that of conventional QPCs. Using same approach, a possibility of making a relatively clean and long 1D wire has been tested.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4710522