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, Mansour 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 ηC = ΔZC = 0.0185.

Original languageEnglish (US)
JournalPhysical review letters
Volume87
Issue number13
DOIs
StatePublished - Jan 1 2001

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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