Time-dependent electron transport through a strongly correlated quantum dot: multiple-probe open-boundary conditions approach
Citation:
A. Pertsova, M. Stamenova and S. Sanvito, Time-dependent electron transport through a strongly correlated quantum dot: multiple-probe open-boundary conditions approach, Journal of Physics: Condensed Matter, 25, 10, 2013, 105501-Download Item:
Abstract:
We present a time-dependent study of electron transport through a strongly correlated quantum dot. The time-dependent current is obtained with the multiple-probe battery method, while adiabatic lattice density functional theory in the Bethe ansatz local-density approximation to the Hubbard model describes the dot electronic structure. We show that for a certain range of voltages the quantum dot can be driven into a dynamical state characterized by regular current oscillations. This is a manifestation of a recently proposed dynamical picture of Coulomb blockade. Furthermore, we investigate how the various approximations to the electron-electron interaction affect the line-shapes of the Coulomb peaks and the I-V characteristics. We show that the presence of the derivative discontinuity in the approximate exchange-correlation potential leads to significantly different results compared to those obtained at the simpler Hartree level of description. In particular, a negative differential conductance (NDC) in the I-V characteristics is observed at large bias voltages and large Coulomb interaction strengths. We demonstrate that such NDC originates from the combined effect of electron-electron interaction in the dot and the finite bandwidth of the electrodes.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
G20267
Author's Homepage:
http://people.tcd.ie/sanvitosDescription:
PUBLISHED
Author: SANVITO, STEFANO
Sponsor:
Science Foundation Ireland (SFI)Type of material:
Journal ArticleCollections
Series/Report no:
Journal of Physics: Condensed Matter25
10
Availability:
Full text availableKeywords:
PhysicsSubject (TCD):
Nanoscience & MaterialsDOI:
http://dx.doi.org/10.1088/0953-8984/25/10/105501Metadata
Show full item recordLicences: