Magneto-polarisability of mesoscopic rings
Laboratoire de Physique des Solides, Associé au CNRS, Bât. 510,
Université Paris-Sud - 91405, Orsay, France
Accepted: 7 November 1996
We calculate the average polarisability of two-dimensional mesoscopic rings in the presence of an Aharonov-Bohm flux. The screening is taken into account self-consistently within a mean-field approximation. We investigate the effects of statistical ensemble, finite frequency and disorder. We emphasize geometrical effects which make the observation of field-dependent polarisability much more favourable on rings than on disks or spheres of comparable radius. The ratio of the flux-dependent to the flux-independent part is estimated for typical GaAs rings.
PACS: 73.20.Fz – Weak localization effects (e.g., quantized states) / 72.15.Rn – Quantum localization / 72.10.-d – Theory of electronic transport; scattering mechanisms
© EDP Sciences, 1996