SU(4) Fermi Liquid State and Spin Filtering in a Double Quantum Dot System

László Borda, Gergely Zaránd, Walter Hofstetter, B. I. Halperin, Jan von Delft

Research output: Contribution to journalArticle

14 Citations (Scopus)


We study a symmetrical double quantum dot (DD) system with strong capacitive interdot coupling using renormalization group methods. The dots are attached to separate leads, and there can be a weak tunneling between them. In the regime where there is a single electron on the DD the low-energy behavior is characterized by an SU(4)-symmetric Fermi liquid theory with entangled spin and charge Kondo correlations and a phase shift [Formula presented]. Application of an external magnetic field gives rise to a large magnetoconductance and a crossover to a purely charge Kondo state in the charge sector with SU(2) symmetry. In a four-lead setup we find perfectly spin-polarized transmission.

Original languageEnglish
Number of pages1
JournalPhysical review letters
Issue number2
Publication statusPublished - Jan 1 2003

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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