Josephson effect for SU(4) carbon nanotube quantum dots

Details Josephson effect for SU(4) carbon nanotube quantum dots Josephson effect for SU(4) carbon nanotube quantum dots

2009-09-07

arxiv.org/abs/0909.1213v2

Phys. Rev. B 81, 012502 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, published version

Scientific paper

We present the theory of the Josephson effect in nanotube dots where an SU(4) symmetry can be realized. We find a remarkably rich phase diagram that significantly differs from the SU(2) case. In particular, \pi-junction behavior is largely suppressed. We analytically obtain the Josephson current in various parameter regions: (i) in the Kondo regime, covering the full crossover from SU(4) to SU(2), (ii) for weak tunnel couplings, and (iii) for large BCS gap. The transition between these regions is studied numerically.

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