SO(5) Non-Fermi Liquid in a Coulomb Box Device

Non-Fermi liquid (NFL) physics can be realized in quantum dot devices where competing interactions frustrate the exact screening of spin or charge degrees freedom. We show that a standard nanodevice architecture, involving coupled to both box and metallic leads, host an exotic SO(5) symmetry Kondo effect, with entangled spin. This NFL state is surprisingly robust breaking channel symmetry, but destabilized by particle-hole asymmetry. By tuning gate voltages, evolves continuously then "flavor" two-channel state. The expected experimental conductance signatures are highlighted.