Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena
TT 6.37: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Optical signatures of Kondo effect in quantum dots — Hakan E. Türeci1, Atac Imamoglu1, Andreas Weichselbaum2, •Markus Hanl2, Theresa Hecht2, and Jan von Delft2 — 1Institute of Quantum Electronics, ETH-Zürich, CH-8093 Zürich, Switzerland — 2Arnold Sommerfeld Center for Theoretical Physics, LMU München, D-80333 München, Germany
We analyze the optical signatures of many body interactions between an optically excited QD electron and an adjacent fermionic reservoir. The optical absorption lineshapes are calculated using the numerical renormalization group, following [1]. The resulting optical lineshape is highly nontrivial: at zero magnetic field, it has a power-law singularity of the form I(ω) ∼ (ω − ωth)− σ with exponent σ showing two distinct cross-overs, which can be understood analytically in terms of the fixed points of the RG flow of the symmetric Anderson model. We also analyze the dependence of the optical response on external magnetic field and finite temperature.
[1] R. Helmes et al., Phys. Rev. B, 72, 125301 (2005)