Fractional Quantum Hall Effect in Organic Molecular Semiconductors

doi:10.1126/science.288.5475.2338

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This article has been retracted

Science 30 June 2000:
Vol. 288. no. 5475, pp. 2338 - 2340
DOI: 10.1126/science.288.5475.2338

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Fractional Quantum Hall Effect in Organic Molecular Semiconductors

J. H. Schön, Ch. Kloc, B. Batlogg

High-quality crystals of the organic molecular semiconductors tetracene and pentacene were used to prepare metal-insulator-semiconductor(MIS) structures exhibiting hole and electron mobilities exceeding10⁴ square centimeters per volt per second. The carrier concentrationin the channel region of these ambipolar field-effect deviceswas controlled by the applied gate voltage. Well-defined Shubnikov-deHaas oscillations and quantized Hall plateaus were observed fortwo-dimensional carrier densities in the range of 10¹¹ per square centimeter. Fractional quantum Hall states were observedin tetracene crystals at temperatures as high as ~2 kelvin.

Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, NJ 07974, USA.

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