Restoring the SU(4) Kondo regime in a double quantum dot system

摘要: We calculate the spectral density and occupations of a system two capacitively coupled quantum dots, each one connected to its own pair conducting leads, in regime parameters which total couplings leads for dot Γ(i) are different. The has been used recently perform pseudospin spectroscopy by controlling independently voltages four leads. For an odd number electrons system, equal coupling Γ1 = Γ2, levels E1 E2 sufficiently large interdot repulsion U12 lies SU(4) symmetric point spin degeneracy Kondo regime. In more realistic case ≠ is broken symmetry reduced SU(2). Nevertheless, we find that essential features recovered appropriately tuning level difference δ - E1. After this tuning, behaves as at low energies. Our results relevant experiments look signatures similar systems.