2009/04/29 by Katherine A. Brown, K. Brown, M. Crişan +3
Engineering · Physics and Astronomy · #Condensed matter physics #Conductance #Coulomb #Coulomb blockade #Coupling (piping) #Detector #Electron #Fano plane #Molecular Junctions and Nanostructures #Noise (video) #Optics #Physics #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Realization (probability) #Semiconductor Quantum Structures and Devices #Transistor #cond-mat.mes-hall
paper · pdf · doi:10.1088/0953-8984/21/21/215604
published as J. Phys. Cond. Matt., 21, 215604 (2009)
openalex publication_date 2009/04/29 · arxiv created 2009/05/12 · arxiv updated 2015/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We consider the transport and the noise characteristics for the case of a T-shape double-quantum-dot system using the equation of motion method. Our theoretical results, obtained in an approximation equivalent to the Hartree-Fock approximation, account for non-zero on-site Coulomb interaction in both the detector and side dots. The existence of a non-zero Coulomb interaction implies an additional two resonances in the detector's dot density of states and thereafter affects the electronic transport properties of the system. The system's conductance presents two Fano dips as a function of the energy of the localized electronic level in the side dot. The Fano dips in the system's conductance can be observed for both strong (fast detector) and weak coupling (slow detector) between the detector dot and the external electrodes. Due to stronger electronic correlations, the noise characteristics in the case of a slow detector are much higher. This setup may be of interest for the practical realization of qubit states in quantum dot systems.