Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2002-08-08
Eur. Phy. J. B 32, 401-405 (2003)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1140/epjb/e2003-00115-6
A unified theory for the current through a nanoscale region of interacting electrons connected to two leads which can be either ferromagnet or superconductor is presented, yielding Meir-Wingreen-type formulas when applied to specific circumstances. In such a formulation, the requirement of gauge invariance for the current is satisfied automatically. Moreover, one can judge unambiguously what quantities can be measured in the transport experiment.
Claro Francisco
Li Baowen
Zeng Zhao Yang
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