Journal
JOURNAL OF APPLIED PHYSICS
Volume 122, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5000319
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Funding
- Realization of Quantum Metrology Triangle (KRISS) [2017 GP2017-0034]
- Convergence Science and Technology for Measurements at the Nanoscale - Korea research Institute of Standards and Science [16011060]
- National Research Foundation of Korea [NRF-2016K1A3A7A03951913, NRF-2015R1A2A1A10056103, SRC2016R1A5A1008184, NRF-2014R1A2A1A11053072]
- National Research Foundation of Korea [2016K1A3A7A03951913] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Our quantum-dot (QD) electron pump has uniqueness in design in that the QD potential shape can be manipulated, especially its potential depth can be controlled by a plunger gate. We find that there exist strong correlations between the potential depth of the QD and the upper frequency limit, f(m), when the modulating microwave power is fixed. As the depth of the QD potential is deepened, f(m) shows decreasing characteristics while the flatness of the 1st current plateau is increased. We have semi-quantitatively analyzed these correlations by using the notion of so-called non-adiabatic Coulomb blockade gap energy, Delta E-LU. We find that Delta E-LU parameter being under control by a plunger gate is proportional to the pumping frequency f. (C) 2017 Author(s).
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