Coulomb oscillations in partially open quantum dots

✍ Scribed by C.H. Crouch; C. Livermore; R.M. Westervelt; K.L. Campman; A.C. Gossard

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 221 KB
• Volume: 20
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1996.0092

✦ Synopsis

We report tunneling measurements of the Coulomb blockade in a single quantum dot at zero magnetic field and dilution refrigerator temperatures with weak tunneling from the dot to one lead (the 'closed' lead, conductance G closed ) and strong tunneling to the other lead (the 'open' lead, conductance G open ). We observe suppression of the Coulomb oscillations with G open ≈ 2e 2 / h, and then see the oscillations return for G open > 2e 2 / h. The oscillations show a strikingly lower threshold temperature at G open ≈ 2e 2 / h than for greater or lesser G open .