NMR measurement of the spin magnetization and spin dynamics in the quantum Hall regimes

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

doi:10.1016/0039-6028(96)00398-6

NMR measurement of the spin magnetization and spin dynamics 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

3 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) (proportional to 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.

Original language	English (US)
Pages (from-to)	261-266
Number of pages	6
Journal	Surface Science
Volume	361-362
DOIs	https://doi.org/10.1016/0039-6028(96)00398-6
State	Published - Jul 20 1996
Externally published	Yes

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

Keywords

Gallium arsenide
Hall effect
Nuclear magnetic resonance
Quantum effects
Quantum wells
Semiconductor-semiconductor heterostructures

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10.1016/0039-6028(96)00398-6

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title = "NMR measurement of the spin magnetization and spin dynamics 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) (proportional to 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.",

keywords = "Gallium arsenide, Hall effect, Nuclear magnetic resonance, Quantum effects, Quantum wells, Semiconductor-semiconductor heterostructures",

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

year = "1996",

month = jul,

day = "20",

doi = "10.1016/0039-6028(96)00398-6",

language = "English (US)",

volume = "361-362",

pages = "261--266",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - NMR measurement of the spin magnetization and spin dynamics in the quantum Hall regimes

AU - Barrett, S. E.

AU - Dabbagh, G.

AU - Pfeiffer, L. N.

AU - West, K. W.

AU - Tycko, R.

PY - 1996/7/20

Y1 - 1996/7/20

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) (proportional to 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) (proportional to 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.

KW - Gallium arsenide

KW - Hall effect

KW - Nuclear magnetic resonance

KW - Quantum effects

KW - Quantum wells

KW - Semiconductor-semiconductor heterostructures

UR - http://www.scopus.com/inward/record.url?scp=0030195262&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030195262&partnerID=8YFLogxK

U2 - 10.1016/0039-6028(96)00398-6

DO - 10.1016/0039-6028(96)00398-6

M3 - Article

AN - SCOPUS:0030195262

SN - 0039-6028

VL - 361-362

SP - 261

EP - 266

JO - Surface Science

JF - Surface Science

ER -

NMR measurement of the spin magnetization and spin dynamics in the quantum Hall regimes

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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