Coulombblockade effect in nonlinear mesoscopic capacitors
Abstract
We consider an interacting quantum dot working as a coherent source of single electrons. The dot is tunnel coupled to a reservoir and capacitively coupled to a gate terminal with an applied ac potential. At low frequencies, this is the quantum analog of the R C circuit with a purely dynamical response. We investigate the quantized dynamics as a consequence of ac pulses with large amplitude. Within a KeldyshGreen function formalism we derive the timedependent current in the Coulomb blockade regime. Our theory thus extends previous models that considered either noninteracting electrons in nonlinear response or interacting electrons in the linear regime. We prove that the electron emission and absorption resonances undergo a splitting when the charging energy is larger than the tunnel broadening. For very large charging energies, the additional peaks collapse and the original resonances are recovered, though with a reduced amplitude. Quantization of the charge emitted by the capacitor is reduced due to Coulomb repulsion and additional plateaus arise. Additionally, we discuss the differential capacitance and resistance as a function of time. We find that to leading order in driving frequency the current can be expressed as a weighted sum of noninteracting currents shifted by the charging energy.
 Publication:

Physical Review B
 Pub Date:
 October 2016
 DOI:
 10.1103/PhysRevB.94.165425
 arXiv:
 arXiv:1608.05968
 Bibcode:
 2016PhRvB..94p5425A
 Keywords:

 Condensed Matter  Mesoscale and Nanoscale Physics
 EPrint:
 13 pages, 9 figures. Minor changes. Published version