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CONDENSED MATTER

Aharonov–Bohm oscillation amplitude in small ballistic interferometers

V. A. Tkachenko^a, Z. D. Kvon^ba, D. V. Shcheglov^ab, A. V. Latyshev^ba, A. I. Toropov^a, O. A. Tkachenko^ab, D. G. Baksheev^a, A. L. Aseev<sup>a

a</sup> Institute of Semiconductor Physics of SB RAS, Novosibirsk
^b Novosibirsk State University

Abstract: Small-radius (110 nm) ring interferometers were fabricated by the local anodic oxidation of AlGaAs/GaAs heterostructures containing 2D electron gas. Measurements and modeling show that a small ring asymmetry, which is detected by an atomic force microscope, leads to a small amplitude of Aharonov–Bohm oscillations, while a stronger asymmetry completely suppresses these oscillations.

PACS: 73.23.Ad, 73.50.-h

Received: 08.01.2004

 English version: Journal of Experimental and Theoretical Physics Letters, 2004, 79:3, 136–140

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