Ultraslow Electron Spin Dynamics in GaAs Quantum Wells Probed by Optically Pumped NMR-Reference-Cited by-同舟云学术

Ultraslow Electron Spin Dynamics in GaAs Quantum Wells Probed by Optically Pumped NMR

Published:1998-07-31 Issue:5377 Volume:281 Page:686-690
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Kuzma N. N.¹,Khandelwal P.¹,Barrett S. E.¹,Pfeiffer L. N.¹,West K. W.¹

Affiliation:

1. N. N. Kuzma, P. Khandelwal, S. E. Barrett, Department of Physics, Yale University, New Haven, CT 06511, USA. L. N. Pfeiffer and K. W. West, Lucent Technologies, Bell Laboratories, Murray Hill, NJ 07974, USA.

Abstract

Optically pumped nuclear magnetic resonance (OPNMR) measurements were performed in two different electron-doped multiple quantum well samples near the fractional quantum Hall effect ground state ν = 1/3. Below 0.5 kelvin, the spectra provide evidence that spin-reversed charged excitations of the ν = 1/3 ground state are localized over the NMR time scale of about 40 microseconds. Furthermore, by varying NMR pulse parameters, the electron spin temperature (as measured by the Knight shift) could be driven above the lattice temperature, which shows that the value of the electron spin–lattice relaxation time τ 1s is between 100 microseconds and 500 milliseconds at ν = 1/3.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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