Yu Liu's research while affiliated with Jilin University and other places
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Publications (7)
The influence of Rashba spin–orbit coupling on the Fano lineshape of the conductance spectrum in a T-shaped double quantum dot structure is theoretically studied. By second-quantizing the electron Hamiltonian in this structure, it is found that the Rashba interaction brings about a spin-flip interdot hopping term. With the enhancement of the Rashba...
When a quantum dot in the Kondo regime couples to two leads (the conduction electron reservoirs) indirectly through intermediate electron levels, two features are noteworthy concerning the Kondo effect. First, the Kondo peak in the spectrum of local density of states becomes narrower as the coupling to the leads is much larger than the interdot cou...
We carry out a comprehensive analysis of Fano effect in electronic transport process through a parallel double quantum dot (QD) structure. First, we establish an expression of the linear conductance in the standard Fano form. This expression provides a uniform way to explain the presence of the Fano antiresonance (or a lack of thereof) in various d...
By means of the non-equilibrium Green function technique, the electronic transport through an N-quantum-dot chain is theoretically studied. By calculating the linear conductance spectrum and the local density of states in quantum dots, we find the resonant peaks in the spectra coincides with the eigen-energies of the N-quantum-dot chain when the do...
For a quantum dot (QD) in the Kondo regime, we introduce a side QD
attached to one of the two leads to mimic an Anderson impurity in the
conduction electron reservoir. Then, we study the peculiar Kondo effect
in such a double QD structure. We find that the Kondo peak in the local
density of states in the QDs exhibits a notable deviation from the
Lo...
The I–V spectrum of electronic transport through a quantum dot chain is calculated by means of the nonequilibrium Green function technique. In such a system, two arbitrary quantum dots are connected with two electron reservoirs through leads. When the dot-lead coupling is very weak, a series of discrete resonant peaks in electron transmission funct...
By means of the nonequilibrium Green function technique, electronic
transport through a multiple-quantum-dot system is theoretically
studied. In this system, a one-dimensional quantum dot chain between two
contacts forms a main channel for the electronic tunneling. Each quantum
dot in the chain couples laterally to a dangling quantum dot. Whenever...
Citations
... Molecular beam epitaxy-grown QD arrays also exhibited a Gaussian statistical distribution in dot size 10,11 . While previous theoretical studies on QDs mainly examined the electronic properties of small QD systems [12][13][14][15][16][17] , a recent study examined the effect of impurity QDs on the electron transport in two-dimensional (2D) QD solids, in which the impurity QD was introduced as a perturbation to a periodic potential 18 . However, a systematic analysis on the quantum transport of an array of QDs with inhomogeneous size distribution is still lacking. ...
... In this work, we would like to adopt the scattering-matrix approach, which is also feasible when the many-body terms are managed by the mean-field approximation. 44,45 The current in either lead, e.g., lead-L, reads 46,47 ...
... A collective degree of freedom of the reservoir is joined with the system to form the supersystem. This transforms the spectral density Γ (0) (ω) to Γ (1) (ω). The mapping can be applied recursively, converting a star configuration into a chain, but also other mappings are conceivable [37]. ...
... An issue of applied value is whether Fano resonances can arise in spin transport in 2D mesoscopic systems. In this regard, there have been studies on the spin-dependent Fano effect or resonance in electronic transport characteristics such as conductance [21,23,[28][29][30][31][32][33][34][35][36][37][38]. In particular, the feasibility of performing single-spin readout in a quantum dot based on Fano resonance in conductance was studied [28], the interplay between the Fano effect and Rashba spinorbit interaction in an Aharanov-Bohm ring coupled with quantum-dot systems was investigated [23,[29][30][31], and Fano-like backscattering leading to dips in the channel conductance was used for spin filtering [32]. ...
... The obvious phenomenon is that the Fano line shapes will appear in the linear AR conductance spectra, and they can also be reversed by adjusting the QD level and local magnetic flux. However, we observe that the Fano resonance conditions are completely different from those in the normal electron transport cases [47]. Therefore, the results in this work provide useful information for describing the Fano interference in the AR process. ...
... This may be explained as follows. In the case of strong coupling limit, the molecular orbital picture is destroyed and it is reasonable to regard the lead-α and the corresponding adjacent QD as an equivalent lead [51]. Then the whole system can be regarded as a parallel-coupled double QDs/superconductor system [52]. ...
