Coulomb oscillations in partially open quantum dots |
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| Affiliation: | 1. Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan;2. Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Koto, Sayo, Hyogo 679-5198, Japan;3. Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan;4. Research Center for Ultra-Precision Science and Technology, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan;1. National Technical University “Kharkov Polytechnic Institute”, 21 Frunze Street, Kharkov 61002, Ukraine;2. Institute for Single Crystals of NAS of Ukraine, 60 Lenin Prospect, Kharkov 61001, Ukraine;3. Department of Electrical Engineering and Computer Science and Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, USA |
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| Abstract: | 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, conductanceGclosed) and strong tunneling to the other lead (the ‘open’ lead, conductanceGopen). We observe suppression of the Coulomb oscillations withGopen≈2e2/h, and then see the oscillations return forGopen>2e2/h. The oscillations show a strikingly lower threshold temperature atGopen≈2e2/hthan for greater or lesserGopen. |
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