Interference Effect in Multi-level Transport through a Quantum Dot

Abstract

We present experimental results and a model to solve the problem of "in-phase Coulomb peaks" observed in transport through a quantum dot. In a marginal region between Coulomb-blockade and open-dot, we have observed Fano-type interference through two energy levels inside the dot, which manifest themselves in two overlapped Coulomb-diamond-like structures in the excitation spectrum. One of the two levels is strongly coupled to the leads and the phase of traversing electrons is locked to it. We have detected the phase change at the vertices and the centers of the larger diamonds through the sign of the Fano's asymmetric parameters supporting the above deduction.

4 pages, 4 figures, to appear in J. Phys. Soc. Jpn. (December 15, 2004)

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Cited by in corpus (14)

• Fano resonances in nanoscale structures
• Fano-Kondo interplay in a side-coupled double quantum dot
• Mesoscopic to universal crossover of transmission phase of multi-level quantum dots
• Supercurrent and multiple singlet-doublet phase transitions of a quantum dot Josephson junction inside an Aharonov-Bohm ring
• A quantum criticality perspective on the charging of narrow quantum-dot levels
• Measurement of the Transmission Phase of an Electron in a Quantum Two-Path Interferometer
• Non-universal transmission phase behaviour of a large quantum dot
• Level-occupation switching of the Quantum Dot, and phase anomalies in mesoscopic interferometry
• Abrupt disappearance and reemergence of the SU(2) and SU(4) Kondo effects due to population inversion
• Transmission zero in a quantum dot with strong electron-electron interaction: Perturbative conductance calculations
• Evidence of Spin-Filtering in Quantum Constrictions with Spin-Orbit Interaction
• The Functional Renormalization Group for Zero-Dimensional Quantum Systems in and out of Equilibrium
• Mesoscopic phase behavior in a quantum dot around crossover between single-level and multilevel transport regimes
• Level occupation switching with density functional theory