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Korringa-like nuclear spin–lattice relaxation in a 2DES at ν=1/2

Tracy, L. A. and Spielman, I. B. and Eisenstein, J. P. and Pfeiffer, L. N. and West, K. W. (2006) Korringa-like nuclear spin–lattice relaxation in a 2DES at ν=1/2. Physica E, 34 (1-2). pp. 220-223. ISSN 1386-9477. doi:10.1016/j.physe.2006.03.038.

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Via a resistively detected NMR technique, the nuclear spin–lattice relaxation time T_1 of ^(71)Ga has been measured in a GaAs/AlGaAs heterostructure containing two weakly coupled 2D electron systems (2DES) at low temperatures, each at Landau level filling v=1/2. Incomplete electronic spin polarization, which has been reported previously for low density 2DESs at v=1/2, should facilitate hyperfine-coupled nuclear spin relaxation owing to the presence of both electron spin states at the Fermi level. Composite fermion theory suggests a Korringa-law temperature dependence: T_1T = constant is expected for temperatures T<1K. Our measurements show that for temperatures in the range 35mK<T<200mK, T_1 rises less rapidly with falling temperature than this law predicts. This may suggest the existence of alternate nuclear spin relaxation mechanisms in this system. Also, our data allows for an estimate of the composite fermion mass.

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Additional Information:© 2006 Elsevier B.V. Available online 17 April 2006. This work was supported by the NSF under Grant No. DMR-0242946 and the DOE under Grant No. DEFG03- 99ER45766.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-99ER45766
Subject Keywords:quantum hall effect; composite fermions; nuclear magnetic resonance
Issue or Number:1-2
Record Number:CaltechAUTHORS:20110602-091813982
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Official Citation:L.A. Tracy, I.B. Spielman, J.P. Eisenstein, L.N. Pfeiffer, K.W. West, Korringa-like nuclear spin-lattice relaxation in a 2DES at [nu]=1/2, Physica E: Low-dimensional Systems and Nanostructures, Volume 34, Issues 1-2, Proceedings of the 16th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS-16), August 2006, Pages 220-223, ISSN 1386-9477, DOI: 10.1016/j.physe.2006.03.038. (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23867
Deposited By: Tony Diaz
Deposited On:02 Jun 2011 18:57
Last Modified:09 Nov 2021 16:18

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