Enhancement of persistent currents due to confinement in metallic samples

V. M. APEL, G. CHIAPPE, AND M. J. SÁNCHEZ

PHYSICAL REVIEW LETTERS

Año: 2000 vol. 85 p. 4152 - 4155

0031-9007

Confinement and surface roughness (SR) effects on the magnitude of the persistent current are analyzed for ballistic bidimensional metallic samples. Depending on the particular geometry, localized border states can show up at half-filling. These border states contribute coherently to the persistent current and its magnitude is enhanced with respect to their value in the absence of confinement. A linear scaling of the typical current Ityp with the number of conduction channels M is obtained. This result is robust with respect to changes in the relevant lengths of the samples and to the SR. Possible links of our results to experiments are also discussed.