The Cooper Pair Pump as a Quantized Current Source

Details The Cooper Pair Pump as a Quantized Current Source The Cooper Pair Pump as a Quantized Current Source

2007-11-01

arxiv.org/abs/0711.0210v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 PRL pages

Scientific paper

10.1103/PhysRevLett.100.117001

A new charge quantization in a phase-polarized Cooper Pair Pump (CPP) is proposed, based on the topological properties of its Hamiltonian ground state over a three-dimensional parameter space $\mathbb{P}$. The charge is quantized using a set of path in $\mathbb{P}$ covering the surface of a torus, and is a multiple of the integer Chern index $c_1$ of this surface. This quantization is asymptotic but the pumped charge converges rapidly to the quantized value with the increase in the path frequency. The topological nature of the current makes this CPP implementation an excellent candidate for a metrological current standard.

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