Ultraslow electron spin dynamics in the fractional quantum Hall regime

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

doi:10.1016/S0921-4526(98)00547-X

Ultraslow electron spin dynamics in the fractional quantum Hall regime

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

Research output: Contribution to journal › Article › peer-review

Abstract

Recent optically pumped nuclear magnetic resonance (OPNMR) measurements in two different electron-doped multiple quantum well samples near the fractional quantum Hall ground state v = 1/3 are reviewed. Below 0.5 K, the spectra provide evidence that the spin-reversed charged excitations of this ground state are localized over the NMR time scale of ∼ 40 μs. By varying NMR pulse parameters, the electron spin temperature (as measured by the Knight shift) could be driven above the lattice temperature. For T_lattice < 0.5 K, these non-equilibrium measurements imply that the value of the electron spin-lattice relaxation time τ_1s lies between 100 μs and 500 ms at v = 1/3.

Original language	English (US)
Pages (from-to)	121-124
Number of pages	4
Journal	Physica B: Condensed Matter
Volume	256-258
DOIs	https://doi.org/10.1016/S0921-4526(98)00547-X
State	Published - Dec 2 1998
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Keywords

Fractional quantum Hall effect
GaAs
NMR

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10.1016/S0921-4526(98)00547-X

Cite this

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title = "Ultraslow electron spin dynamics in the fractional quantum Hall regime",

abstract = "Recent optically pumped nuclear magnetic resonance (OPNMR) measurements in two different electron-doped multiple quantum well samples near the fractional quantum Hall ground state v = 1/3 are reviewed. Below 0.5 K, the spectra provide evidence that the spin-reversed charged excitations of this ground state are localized over the NMR time scale of ∼ 40 μs. By varying NMR pulse parameters, the electron spin temperature (as measured by the Knight shift) could be driven above the lattice temperature. For Tlattice < 0.5 K, these non-equilibrium measurements imply that the value of the electron spin-lattice relaxation time τ1s lies between 100 μs and 500 ms at v = 1/3.",

keywords = "Fractional quantum Hall effect, GaAs, NMR",

author = "Kuzma, \{N. N.\} and P. Khandelwal and Barrett, \{S. E.\} and Pfeiffer, \{L. N.\} and West, \{K. W.\}",

year = "1998",

month = dec,

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doi = "10.1016/S0921-4526(98)00547-X",

language = "English (US)",

volume = "256-258",

pages = "121--124",

journal = "Physica B: Condensed Matter",

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TY - JOUR

T1 - Ultraslow electron spin dynamics in the fractional quantum Hall regime

AU - Kuzma, N. N.

AU - Khandelwal, P.

AU - Barrett, S. E.

AU - Pfeiffer, L. N.

AU - West, K. W.

PY - 1998/12/2

Y1 - 1998/12/2

N2 - Recent optically pumped nuclear magnetic resonance (OPNMR) measurements in two different electron-doped multiple quantum well samples near the fractional quantum Hall ground state v = 1/3 are reviewed. Below 0.5 K, the spectra provide evidence that the spin-reversed charged excitations of this ground state are localized over the NMR time scale of ∼ 40 μs. By varying NMR pulse parameters, the electron spin temperature (as measured by the Knight shift) could be driven above the lattice temperature. For Tlattice < 0.5 K, these non-equilibrium measurements imply that the value of the electron spin-lattice relaxation time τ1s lies between 100 μs and 500 ms at v = 1/3.

AB - Recent optically pumped nuclear magnetic resonance (OPNMR) measurements in two different electron-doped multiple quantum well samples near the fractional quantum Hall ground state v = 1/3 are reviewed. Below 0.5 K, the spectra provide evidence that the spin-reversed charged excitations of this ground state are localized over the NMR time scale of ∼ 40 μs. By varying NMR pulse parameters, the electron spin temperature (as measured by the Knight shift) could be driven above the lattice temperature. For Tlattice < 0.5 K, these non-equilibrium measurements imply that the value of the electron spin-lattice relaxation time τ1s lies between 100 μs and 500 ms at v = 1/3.

KW - Fractional quantum Hall effect

KW - GaAs

KW - NMR

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U2 - 10.1016/S0921-4526(98)00547-X

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SN - 0921-4526

VL - 256-258

SP - 121

EP - 124

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

ER -

Ultraslow electron spin dynamics in the fractional quantum Hall regime

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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