Coulomb Blockade and Super Universality of the Theta-Angle

Details Coulomb Blockade and Super Universality of the Theta-Angle Coulomb Blockade and Super Universality of the Theta-Angle

2007-02-16

arxiv.org/abs/cond-mat/0702400v1

Phys. Rev. Lett. 101, 056801 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTeX, 4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.101.056801

Based on the Ambegaokar-Eckern-Schon approach to the Coulomb blockade we develop a complete quantum theory of the single electron transistor. We identify a previously unrecognized physical observable q^\prime in the problem that, unlike the usual average charge (Q) on the island, is robustly quantized for any finite value of the tunneling conductance as the temperature goes to absolute zero. This novel quantity is fundamentally related to the non-symmetrized noise of the system. We present a unifying scaling diagram in the q^\prime - g^\prime plane where g^\prime denotes the conductance of the system. The results display all the super universal topological features of the theta-angle concept that previously arose in the theory of the quantum Hall effect.

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