Details

Autor(en) / Beteiligte

• Deblock, R
• Noat, Y
• Bouchiat, H
• Reulet, B
• Mailly, D

Titel

Measurements of flux-dependent screening in aharonov-bohm rings

Ist Teil von

• Physical review letters, 2000-06, Vol.84 (23), p.5379-5382

Ort / Verlag

United States

Erscheinungsjahr

2000

Quelle

American Physical Society

Beschreibungen/Notizen

• In order to investigate the effect of electronic phase coherence on screening we have measured the flux-dependent polarizability of isolated mesoscopic rings at 350 MHz. At low temperatures (below 100 mK) both the nondissipative and the dissipative parts of the polarizability exhibit flux oscillations with a period of one-half a flux quantum in a ring. The sign and amplitude of the effect are in good agreement with recent theoretical predictions. The observed positive magnetopolarizability corresponds to an enhancement of screening when time reversal symmetry is broken. The effect of electronic density and temperature are also measured.