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Collapse of the Even-Denominator Fractional Quantum Hall Effect in Tilted Fields

Eisenstein, J. P. and Willett, R. and Stormer, H. L. and Tsui, D. C. and Gossard, A. C. and English, J. H. (1988) Collapse of the Even-Denominator Fractional Quantum Hall Effect in Tilted Fields. Physical Review Letters, 61 (8). pp. 997-1000. ISSN 0031-9007.

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The newly discovered even-denominator fractional quantum Hall effect at filling factor ν=5/2 is found to collapse rapidly as the magnetic field is tilted away from the normal to the two-dimensional-electron-gas plane. No similar effect has been reported in tilted-field studies of the spin-polarized, odd-denominator effect at ν=2/3 and 1/3. Since a primary result of such tilting is increased spin splittings, the collapse of the ν=5/2 effect strongly suggests that the underlying state is not spin polarized. Condensation into such a quantum liquid must involve substantial spin reversal.

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Additional Information:©1988 The American Physical Society Received 25 April 1988 It is a pleasure to thank S. M. Girvin, A. H. MacDonald, and D. Yoshioka for useful discussions and Kirk Baldwin for his excellent technical assistance. The work of one of us (D.C.T.) is supported by National Science Foundation Grant No. DMR-8212167 and U.S. Office of Naval Research Grant No. 00014-82-K-0450.
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Deposited On:25 Jul 2006
Last Modified:18 Sep 2014 18:11

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