Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-10-14
Phys. Rev. Lett. 102, 136805 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4+ pages, 3 figures, PRL version
Scientific paper
10.1103/PhysRevLett.102.136805
Understanding the charging of exceptionally narrow levels in quantum dots in the presence of interactions remains a challenge within mesoscopic physics. We address this fundamental question in the generic model of a narrow level capacitively coupled to a broad one. Using bosonization we show that for arbitrary capacitive coupling charging can be described by an analogy to the magnetization in the anisotropic Kondo model, featuring a low-energy crossover scale that depends in a power-law fashion on the tunneling amplitude to the level. Explicit analytical expressions for the exponent are derived and confirmed by detailed numerical and functional renormalization-group calculations.
Hecht Theresa
Karrasch Christoph
Kashcheyevs Vyacheslavs
Meden Volker
Schiller Avraham
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