Interference and interaction effects in multi-level quantum dots

Details Interference and interaction effects in multi-level quantum dots Interference and interaction effects in multi-level quantum dots

2000-10-18

arxiv.org/abs/cond-mat/0010250v2

Phys. Rev. B 64, 125309 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures included, typos corrected

Scientific paper

10.1103/PhysRevB.64.125309

Using renormalization group techniques, we study spectral and transport properties of a spinless interacting quantum dot consisting of two levels coupled to metallic reservoirs. For strong Coulomb repulsion $U$ and an applied Aharonov-Bohm phase $\phi$, we find a large direct tunnel splitting $|\Delta|\sim (\Gamma/\pi)|\cos(\phi/2)|\ln(U/\omega_c)$ between the levels of the order of the level broadening $\Gamma$. As a consequence we discover a many-body resonance in the spectral density that can be measured via the absorption power. Furthermore, for $\phi=\pi$, we show that the system can be tuned into an effective Anderson model with spin-dependent tunneling.

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