Gammel, P. L. and Bishop, D. J. and Eisenstein, J. P. and English, J. H. and Gossard, A. C. and Ruel, R. and Stormer, H. L. (1988) Ultralow-temperature behavior of the ν=5/2 fractional quantum hall effect. Physical Review B, 38 (14). pp. 10128-10130. ISSN 0163-1829. http://resolver.caltech.edu/CaltechAUTHORS:GAMprb88
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The newly discovered even-denominator fractional quantum Hall effect at filling factor ν=5/2 has been studied at ultralow temperatures. While ρxx is not found to vanish in the temperature range studied, the minimum in ρxx is seen to drop at the lowest temperatures. While this drop is insufficient to determine the energy gap, Δ, it may be combined with the temperature dependence of the background resistivity to give a value of Δ∼26 mK. Because of the high electron-phonon relaxation rate, τε^-1=(2.9×10^3)T^3 sec^-1K^-3, a minimum electron temperature of 9 mK could be obtained with a residual heat leak of 8×10^-14 W. It appears likely that ρxx approaches zero as T→0.
|Additional Information:||©1988 The American Physical Society Received 18 August 1988 We would like to thnak K. W. Baldwin for technical assistance.|
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|Deposited On:||12 Sep 2006|
|Last Modified:||26 Dec 2012 09:02|
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