Quantum phase transition and conductivity of parallel quantum dots with a moderate Coulomb interaction

V. S. Protsenko, A. A. Katanin

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1 Citation (Scopus)

Abstract

We study the effects of electronic interactions on transport through parallel quantum dots connected symmetrically to leads, focusing on the case of an intermediate value of the on-site Coulomb interaction at each quantum dot. We apply both the mean-field (MF) approximation and the functional renormalization group (fRG) approach with using the Litim regularization scheme in frequency space to treat the effect of interaction and calculate the energy levels, the magnetization, the square of local spin as well as the linear conductance as a function of gate voltage. Already for intermediate values of the Coulomb interaction, the system exhibits a quantum phase transition from the parallel aligned (high spin state) to the paramagnetic (low spin) regime. This phase transition is accompanied by the appearance of the step discontinuities in the conductance, which can be observed in the experiment.

Original languageEnglish
Article number012028
JournalJournal of Physics: Conference Series
Volume690
Issue number1
DOIs
Publication statusPublished - 26 Feb 2016
Externally publishedYes
Event17th Russian Youth Conference on Physics of Semiconductors and Nanostructures, Opto- and Nanoelectronics, RYCPS 2015 - St. Petersburg, Russian Federation
Duration: 23 Nov 201527 Nov 2015

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