Quan tized Con duc tance in Nanocontacts

2/20/03

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Table of Contents

Quan tized Con duc tance in Nanocontacts

Diffusive Regime

Electrons = Gas Molecules

Electrical Conduction

Limitations of Classical Theory

Conclusion of Diffusive Regime

Ballistic Regimefrom Landauer

“What is measured when you measure CONDUCTANCE?”

Metals _ a _ 1eVSemiconductors >> a _ a few meV

Landauer’s Formula

Ballistic Regimefrom van Wees

Energy of Electrons

Assumptionsfor Ballistic Transport

Quantized Conductance

_ Magnetic Field

Nanocontact Experiments

Correction Term from Foley

Further Correction

STM Imagesfrom Takayanagi, et al

Author: UotS