Chapter 3 . Coulomb Blockade In Single And Double Quantum Dots
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چکیده
A few years ago, Professor Kastner's research group discovered that the conductance through a quantum dot weakly coupled to the leads shows periodic peaks as a function of the voltage on a gate electrode. 1 This behavior was attributed to the phenomenon of Coulomb blockade: to add an electron to the dot, the system must have an energy equal to the electrostatic energy of a dot charged by one electron. Most of the theoretical and experimental work on Coulomb blockade is devoted to the case when the quantum dot is separated from the leads by very high tunnel barriers, which ensure the discreteness of charge in the dot. A recent experiment2 indicates that as the height of the barriers is lowered, the Coulomb blockade peaks are smeared and transformed into small oscillations. Apparently, as one lowers the barriers between the dot and the leads, the discreteness of the charge of the dot is smeared, and the Coulomb blockade is suppressed. An important theoretical problem is to find the conditions at which a dot strongly coupled to the reservoirs can exhibit the Coulomb blockade.
منابع مشابه
Srction 2 Quantum - Effect Devices Chapter 1 Statistical Mechanics of Quantum Dots Chapter 2 Artificial Atoms Chapter 3 Coulomb Blockade in Single and Double Quantum Dots
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تاریخ انتشار 2009