Do quantum dots allow one access to pseudogap Kondo physics?

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For the last decade (Phys. World 14 (1) (2001) 33), tunable quantum dot systems have allowed the investigation of Kondo physics wherein the quenching of a single spin on an artificial atom affects the conductance. The pseudogap Kondo model (pKm) featuring a density of states ρ(ε)=C|ε|r, introduced by Withoff and Fradkin (Phys. Rev. Lett. 64 (1990) 1835) in 1990 was predicted to exhibit Kondo-like physics above a critical value of the Kondo coupling, Jc, which several groups have shown by numerical renormalization group (RG) is finite for r<12. Gonzalez-Buxton et al. (Phys. Rev. B 57 (1998) 14254) showed that the strong coupling limit of the particle-hole symmetric model leads to a non-trivial π(1-r)/2 phase shift at low temperatures, indicating incomplete screening of the local moment, while away from particle-hole symmetry (p-hs) one generically flows towards a ground state with δ∼π. We examine the implications of this model for quantum dots whose leads are Fermi liquid-like, yet possess a tunneling density of states (TDOS) which is suppressed at the Fermi energy as a power law. © 2005 Elsevier B.V. All rights reserved.




Hopkinson, J., Le Hur, K., & Dupont, É. (2005). Do quantum dots allow one access to pseudogap Kondo physics? In Physica B: Condensed Matter (Vol. 359–361, pp. 1454–1456).

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