DYNAMIC ADMITTANCE OF ATOMIC WIRES

We have investigated the low-frequency admittance of quantum wires in which a section consists of several Al atoms. The atomic section is co nnected to two three-dimensional leads that are modeled by the jellium model. The quantum scattering problem is involved by combining the fi rst-principles nb initio method with a transfer-matrix evaluation of t he scattering matrix. The ac admittance is then computed by evaluating various partial densities of states. The nature of the ac responses a re predicted for these Al atomic wires.