Gramespacher T, Matveev KA
Department of Physics, Duke University, Durham, North Carolina 27708-0305, USA.
Phys Rev Lett. 2000 Nov 20;85(21):4582-5. doi: 10.1103/PhysRevLett.85.4582.
We study the Coulomb blockade in a grain coupled to a lead via a resonant impurity level. We show that the strong energy dependence of the transmission coefficient through the impurity level can have a dramatic effect on the quantization of the grain charge. In particular, if the resonance is sufficiently narrow, the Coulomb staircase shows very sharp steps even if the transmission through the impurity at the Fermi energy is perfect. This is in contrast to the naive expectation that perfect transmission should completely smear charging effects.
我们研究了通过一个共振杂质能级与一条引线耦合的量子点中的库仑阻塞现象。我们表明，通过杂质能级的传输系数对能量的强烈依赖性会对量子点电荷的量子化产生显著影响。特别是，如果共振足够窄，即使在费米能级处通过杂质的传输是完美的，库仑台阶也会显示出非常尖锐的台阶。这与那种认为完美传输应该完全消除充电效应的天真预期形成了对比。
