A Mesoscopic Resonating Valence Bond system on a triple dot

Details A Mesoscopic Resonating Valence Bond system on a triple dot A Mesoscopic Resonating Valence Bond system on a triple dot

2005-10-17

arxiv.org/abs/cond-mat/0510450v2

Phys. Rev. Lett. 96, 106803 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

final version to appear in PRL

Scientific paper

10.1103/PhysRevLett.96.106803

We introduce a mesoscopic pendulum from a triple dot. The pendulum is fastened through a singly-occupied dot (spin qubit). Two other strongly capacitively islands form a double-dot charge qubit with one electron in excess oscillating between the two low-energy charge states (1,0) and (0,1); this embodies the weight of the pendulum. The triple dot is placed between two superconducting leads as shown in Fig. 1. Under well-defined conditions, the main proximity effect stems from the injection of resonating singlet (valence) bonds on the triple dot. This gives rise to a Josephson current that is charge- and spin-dependent. Consequences in a SQUID-geometry are carefully investigated.

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