New phase transition between partially and fully polarized quantum hall states with charge and spin gaps at ν = 2/3

N. Freytag; Y. Tokunaga; M. HorvatiƗ; C. Berthier; M. Shayegan; L. P. Lévy

doi:10.1103/PhysRevLett.87.136801

New phase transition between partially and fully polarized quantum hall states with charge and spin gaps at ν = 2/3

N. Freytag, Y. Tokunaga, M. HorvatiƗ, C. Berthier, M. Shayegan, L. P. Lévy

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Abstract

The average electron spin polarization P of a two-dimensional electron gas confined in GaAs/GaAlAs multiple quantum wells was measured by NMR near the fractional quantum Hall state with filling factor ν = 2/3. Above this filling factor (2/3 ≤ ν < 0.85), a strong depolarization is observed corresponding to two spin flips per additional flux quantum. The most remarkable behavior of the polarization is observed at ν = 2/3, where a quantum phase transition from a partially polarized (P ≈ 3/4) to a fully polarized (P = 1) state can be driven by increasing the ratio between the Zeeman and the Coulomb energy above a critical value η_C = Δ_Z/Δ_C = 0.0185.

Original language	English (US)
Journal	Physical review letters
Volume	87
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.87.136801
State	Published - 2001

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.87.136801

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title = "New phase transition between partially and fully polarized quantum hall states with charge and spin gaps at ν = 2/3",

abstract = "The average electron spin polarization P of a two-dimensional electron gas confined in GaAs/GaAlAs multiple quantum wells was measured by NMR near the fractional quantum Hall state with filling factor ν = 2/3. Above this filling factor (2/3 ≤ ν < 0.85), a strong depolarization is observed corresponding to two spin flips per additional flux quantum. The most remarkable behavior of the polarization is observed at ν = 2/3, where a quantum phase transition from a partially polarized (P ≈ 3/4) to a fully polarized (P = 1) state can be driven by increasing the ratio between the Zeeman and the Coulomb energy above a critical value ηC = ΔZ/ΔC = 0.0185.",

author = "N. Freytag and Y. Tokunaga and M. HorvatiƗ and C. Berthier and M. Shayegan and L{\'e}vy, {L. P.}",

year = "2001",

doi = "10.1103/PhysRevLett.87.136801",

language = "English (US)",

volume = "87",

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T1 - New phase transition between partially and fully polarized quantum hall states with charge and spin gaps at ν = 2/3

AU - Freytag, N.

AU - Tokunaga, Y.

AU - HorvatiƗ, M.

AU - Berthier, C.

AU - Shayegan, M.

AU - Lévy, L. P.

PY - 2001

Y1 - 2001

N2 - The average electron spin polarization P of a two-dimensional electron gas confined in GaAs/GaAlAs multiple quantum wells was measured by NMR near the fractional quantum Hall state with filling factor ν = 2/3. Above this filling factor (2/3 ≤ ν < 0.85), a strong depolarization is observed corresponding to two spin flips per additional flux quantum. The most remarkable behavior of the polarization is observed at ν = 2/3, where a quantum phase transition from a partially polarized (P ≈ 3/4) to a fully polarized (P = 1) state can be driven by increasing the ratio between the Zeeman and the Coulomb energy above a critical value ηC = ΔZ/ΔC = 0.0185.

AB - The average electron spin polarization P of a two-dimensional electron gas confined in GaAs/GaAlAs multiple quantum wells was measured by NMR near the fractional quantum Hall state with filling factor ν = 2/3. Above this filling factor (2/3 ≤ ν < 0.85), a strong depolarization is observed corresponding to two spin flips per additional flux quantum. The most remarkable behavior of the polarization is observed at ν = 2/3, where a quantum phase transition from a partially polarized (P ≈ 3/4) to a fully polarized (P = 1) state can be driven by increasing the ratio between the Zeeman and the Coulomb energy above a critical value ηC = ΔZ/ΔC = 0.0185.

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JO - Physical review letters

JF - Physical review letters

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New phase transition between partially and fully polarized quantum hall states with charge and spin gaps at ν = 2/3

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