Quantum dot in the pseudogap Kondo state
Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, Canada
Corresponding author: a email@example.com
Revised: 19 September 2005
Published online: 19 January 2006
We investigate the transport properties of a (small) quantum dot connected to Fermi liquid leads with a power-law density of states (DOS). Such a system, if experimentally realizable, will have interesting physical properties including: (i) non-saturating Coulomb blockade peak widths; (ii) a non-unitary Kondo peak symmetrically placed between Coulomb blockade peaks; (iii) an absence of conductance away from particle-hole symmetry at sufficiently low temperatures; and (iv) evidence of a quantum critical point as a function of dot-lead hopping. These properties are compared and contrasted with one dimensional Luttinger systems exhibiting a power-law “tunneling-DOS”.
PACS: 73.23.Hk – Coulomb blockade; single-electron tunneling / 73.63.Kv – Quantum dots / 73.63.-b – Electronic transport in nanoscale materials and structures / 72.15.Qm – Scattering mechanisms and Kondo effect
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006