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Low temperature conductance fluctuations in double-dot system

✍ Scribed by N Aoki; D Oonishi; Y Iwase; K Ishibashi; Y Aoyagi; Y Ochiai

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 329 KB
Volume: 63
Category: Article
ISSN: 0167-9317
DOI: 10.1016/s0167-9317(02)00639-1

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✦ Synopsis

We have studied the low temperature conductance fluctuations in double-dot systems. The electron wave coupling between ballistic quantum dots has been investigated in a pair of coupled quantum dots defined by several independently-tunable quantum-point-contacts (QPCs). Reproducible conductance fluctuations are observed in the low temperature magneto-conductance at low magnetic fields and a clear difference between weak and strong couplings has been identified as the gap of the QPC corresponding to the inter-dot coupling is varied. This suggests clear evidence for a specific spread of the coupling orbit over the whole dot region.

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