Abstract
We study theoretically the transport properties of electrons in a quantum dot system with spin–orbit coupling. By using the quantum master equation approach, the shot noise and skewness of the transport electrons are calculated. We obtain super-Poisson noise behaviour by investigating the full counting statistics of the transport system. We discover super-Poisson behaviour is more obvious with the spin polarization increasing. More importantly, we discover the suppression of shot noise induced by spin–orbit coupling. The value of shot noise is gradually decreasing when spin–orbit coupling strength increases.
Highlights
The quantum transport in low-dimensional systems has attracted a great deal of attention, especially spin-polarized transport, known as spintronics [1,2]
Apart from this, we can still obtain the suppression of shot noise, and super-Poisson noise is quite evident for relatively low levels of spin–orbit coupling strength
The transport properties of the spin–orbit coupled quantum dot (QD) system are discussed under strong Coulomb blockade which can result in super-Poisson characteristics
Summary
The quantum transport in low-dimensional systems has attracted a great deal of attention, especially spin-polarized transport, known as spintronics [1,2]. The transport process and the statistics of transferred charges can be strongly influenced by electron–electron interactions and quantum correlations. Full 2 counting statistics of electronic transport through nanoscopic systems can provide more information on the correlations in molecular quantum dot (QD) systems [17,18]. There has been more theoretical work on this concept and fewer experimental applications, which provides extra motivation to explore full counting statistics of a molecular QD system with an external spin. It turns out that counting statistics is extremely important in experimental physics as this approach has the capability to measure high-order cumulants and the entire distribution of transferred charges. It is of great scientific significance to explore the effect of spin–orbit coupling on the transport system, especially for the design of spin devices
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