Decoupling and antiresonance in electronic transport through a quantum dot chain embodied in an Aharonov-Bohm interferometer
arXiv:0902.2243 · doi:10.1016/j.physb.2009.03.032
Abstract
Electronic transport through a quantum dot chain embodied in an Aharonov-Bohm interferometer is theoretically investigated. In such a system, it is found that only for the configurations with the same-numbered quantum dots side-coupled to the quantum dots in the arms of the interferometer, some molecular states of the quantum dot chain decouple from the leads. Namely, in the absence of magnetic flux all odd molecular states decouple from the leads, but all even molecular states decouple from the leads when an appropriate magnetic flux is introduced. Interestingly, the antiresonance position in the electron transport spectrum is independent of the change of the decoupled molecular states. In addition, when considering the many-body effect within the second-order approximation, we show that the emergence of decoupling gives rise to the apparent destruction of electron-hole symmetry. By adjusting the magnetic flux through either subring, some molecular states decouple from one lead but still couple to the other, and then some new antiresonances occur.
7 pages, 7 figures
References in corpus (22)
- Quantum Computation with Quantum Dots
- Kondo Physics in a Single Electron Transistor
- Time-dependent transport in interacting and non-interacting mesoscopic systems
- Electron transport through double quantum dots
- A Tunable Kondo Effect in Quantum Dots
- Coupled quantum dots as quantum gates
- From the Kondo Regime to the Mixed-Valence Regime in a Single-Electron Transistor
- Quantum transport theory for nanostructures with Rashba spin-orbital interaction
- Fano Resonance in a Quantum Wire with a Side-coupled Quantum Dot
- Tunable Fano effect in parallel-coupled double quantum dot system
- Electronic transport through a parallel--coupled triple quantum dot molecule: Fano resonances and bound states in the continuum
- Flux-Dependent Level Attraction in Double-Dot Aharonov-Bohm Interferometers
- Observation of the Fano-Kondo Anti-Resonance in a Quantum Wire with a Side-Coupled Quantum Dot
- Transport through a quantum wire with a side quantum-dot array
- Spin filters with Fano dots
- Transmission through Quantum Dots: Focus on Phase Lapses
- Noise Correlations in a Coulomb Blockaded Quantum Dot
- Coherent probing of excited quantum dot states in an interferometer
- Spin-charge filtering through a spin-orbit coupled quantum dot controlled via an Aharonov-Bohm interferometer
- Antiresonances as precursors of decoherence
- Two-particle localization and antiresonance in disordered spin and qubit chains
- Non-circular semiconductor nanorings of type I and II: Emission kinetics in the exciton Aharonov-Bohm effect