期刊
PHYSICAL REVIEW B
卷 62, 期 24, 页码 R16271-R16274出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.62.R16271
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The current in response to a rectangular pulsed bias potential is calculated exactly for a special point in the parameter space of the nonequilibrium Kondo model. Our simple analytical solution shows the all essential features predicted by the noncrossing approximation, including a hierarchy of time scales for the rise, saturation, and falloff of the current; current oscillations with a frequency of eV/(h) over bar; and the instantaneous reversal of the falloff current for certain pulse lengths. Rich interference patterns are found for a nonzero magnetic field (either de or pulsed), with several underlying time scales. These features should be observable in ultrasmall quantum dots.
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