Optically pumped nuclear magnetic resonance in the quantum Hall regimes

S. E. Barrett; G. Dabbagh; L. N. Pfeiffer; K. W. West; R. Tycko

doi:10.1088/0268-1242/11/11S/005

Optically pumped nuclear magnetic resonance in the quantum Hall regimes

S. E. Barrett, G. Dabbagh, L. N. Pfeiffer, K. W. West, R. Tycko

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

2 Scopus citations

Abstract

We review our recent measurements of the Knight shift (K_s(v, T)) and spin-lattice relaxation time (T₁(v, T)) of the ⁷¹Ga nuclei located in n-doped GaAs quantum wells using optically pumped NMR, for Landau level filling 0.66 < v < 1.76 and temperature 1.55 K < T < 20 K. K_s(v) (∝ the electron spin polarization 〈S_z(v)〉) drops precipitously on either side of v = 1, which is evidence that the charged excitations of the v = 1 ground state are finite-size skyrmions. For v < 1 the data are consistent with a many-body ground state which is not fully spin polarized, with a very small spin excitation gap that increases as v → 2/3.

Original language	English (US)
Pages (from-to)	1488-1492
Number of pages	5
Journal	Semiconductor Science and Technology
Volume	11
Issue number	11 SUPPL. S
DOIs	https://doi.org/10.1088/0268-1242/11/11S/005
State	Published - Nov 1996
Externally published	Yes

All Science Journal Classification (ASJC) codes

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

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10.1088/0268-1242/11/11S/005

Cite this

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title = "Optically pumped nuclear magnetic resonance in the quantum Hall regimes",

abstract = "We review our recent measurements of the Knight shift (Ks(v, T)) and spin-lattice relaxation time (T1(v, T)) of the 71Ga nuclei located in n-doped GaAs quantum wells using optically pumped NMR, for Landau level filling 0.66 < v < 1.76 and temperature 1.55 K < T < 20 K. Ks(v) (∝ the electron spin polarization 〈Sz(v)〉) drops precipitously on either side of v = 1, which is evidence that the charged excitations of the v = 1 ground state are finite-size skyrmions. For v < 1 the data are consistent with a many-body ground state which is not fully spin polarized, with a very small spin excitation gap that increases as v → 2/3.",

author = "Barrett, {S. E.} and G. Dabbagh and Pfeiffer, {L. N.} and West, {K. W.} and R. Tycko",

year = "1996",

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doi = "10.1088/0268-1242/11/11S/005",

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pages = "1488--1492",

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T1 - Optically pumped nuclear magnetic resonance in the quantum Hall regimes

AU - Barrett, S. E.

AU - Dabbagh, G.

AU - Pfeiffer, L. N.

AU - West, K. W.

AU - Tycko, R.

PY - 1996/11

Y1 - 1996/11

N2 - We review our recent measurements of the Knight shift (Ks(v, T)) and spin-lattice relaxation time (T1(v, T)) of the 71Ga nuclei located in n-doped GaAs quantum wells using optically pumped NMR, for Landau level filling 0.66 < v < 1.76 and temperature 1.55 K < T < 20 K. Ks(v) (∝ the electron spin polarization 〈Sz(v)〉) drops precipitously on either side of v = 1, which is evidence that the charged excitations of the v = 1 ground state are finite-size skyrmions. For v < 1 the data are consistent with a many-body ground state which is not fully spin polarized, with a very small spin excitation gap that increases as v → 2/3.

AB - We review our recent measurements of the Knight shift (Ks(v, T)) and spin-lattice relaxation time (T1(v, T)) of the 71Ga nuclei located in n-doped GaAs quantum wells using optically pumped NMR, for Landau level filling 0.66 < v < 1.76 and temperature 1.55 K < T < 20 K. Ks(v) (∝ the electron spin polarization 〈Sz(v)〉) drops precipitously on either side of v = 1, which is evidence that the charged excitations of the v = 1 ground state are finite-size skyrmions. For v < 1 the data are consistent with a many-body ground state which is not fully spin polarized, with a very small spin excitation gap that increases as v → 2/3.

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JO - Semiconductor Science and Technology

JF - Semiconductor Science and Technology

IS - 11 SUPPL. S

ER -

Optically pumped nuclear magnetic resonance in the quantum Hall regimes

Abstract

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