Abstract
The finite-frequency shot noise of electron transport through a serially coupled double quantum dot system with Rashba spin-orbit coupling is studied based on an effective particle-number-resolved quantum master equation. We demonstrate that the finite-frequency shot noise displays an obvious dip, and the dip position, which is independent of the spin polarizations of the source and drain electrodes, is determined by the energy difference between the coherent singly-occupied eigenstates of the quantum dot system. These results suggest that the dip position of the finite-frequency shot noise can be used to quantitatively extract the information about the energy difference between the coherent singly-occupied eigenstates and the magnitude of Rashba spin-orbit coupling. The predicted properties of the finite-frequency shot noise are of particular interest for understanding of the internal dynamics of the coupled quantum dot systems.
Highlights
The finite-frequency shot noise of electron transport through quantum dot (QD) systems has attracted considerable attention both experimentally[1] and theoretically[2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18] because it is a powerful diagnostic tool for extracting the information about the transport time scales associated with the internal energy structures of coupled QD systems[6,7,8,9,10,11,12,13,14,15] and probing the internal dynamics of coupled QD systems,[16,17,18] which cannot be obtained through the average current and the zero-frequency shot noise
We study the influences of the magnitude of the spinorbit coupling (SOC), the magnitude of the external magnetic field, the energy-level detuning and the spin polarization rates of the two electrodes on the finitefrequency shot noise of electron transport through the serially coupled double QD system with SOC
We have studied the influences of the magnitude of the SOC, the magnitude of the external magnetic field, the energy-level detuning and the spin polarization rates of the two electrodes on the finite-frequency shot noise in the serially coupled double QD system
Summary
The finite-frequency shot noise of electron transport through quantum dot (QD) systems has attracted considerable attention both experimentally[1] and theoretically[2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18] because it is a powerful diagnostic tool for extracting the information about the transport time scales associated with the internal energy structures of coupled QD systems[6,7,8,9,10,11,12,13,14,15] and probing the internal dynamics of coupled QD systems,[16,17,18] which cannot be obtained through the average current and the zero-frequency shot noise. Finite-frequency shot noise gives up to a dip, and the position of the dip, which is independent of the spin polarization of the two electrodes, is determined by the magnitude of the SOC and the energy-level detuning between the two QDs. the dip position of the finite-frequency shot noise can quantitatively extract information about the magnitude of the SOC when the energy-level detuning is equal to zero.
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