Electron Transport in Metallic Grains

Details Electron Transport in Metallic Grains Electron Transport in Metallic Grains

2002-02-21

arxiv.org/abs/cond-mat/0202372v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Since the original submission, we have gathered data in weak coupling regime, showing that our initial speculation - that the

Scientific paper

We discuss electron transport in individual nanometer-scale metallic grains at dilution refrigerator temperatures. In the weak coupling regime, the grains exhibit Coulomb blockade and discrete energy levels. Electron-electron interactions lead to clustering and broadening of quasiparticle states. Magnetic field dependences of tunneling resonances directly reveal Kramers degeneracy and Lande g-factors. In grains of Au, which have strong spin-orbit interaction, g-factors are strongly suppressed from the free electron value. We have recently studied grains in the strong coupling regime. Coulomb blockade persists in this regime. It leads to a suppression in sample conductance at zero bias voltage at low temperatures. The conductance fluctuates with the applied magnetic field near zero bias voltage. We present evidence that the fluctuations are induced by electron spin. This paper reviews the evolving progress in interpreting these observations.

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