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Observation of a new phase transition between fully and partially polarized quantum Hall states with charge and spin gaps at $
u = 2/3$ | N. Freytag
; Y. Tokunaga
; M. Horvatic
; C. Berthier
; M. Shayegan
; L. Levy
; | Date: |
30 May 2001 | Journal: | Phys. Rev. Lett. 87, 136801 (2001) | Subject: | Mesoscopic Systems and Quantum Hall Effect; Strongly Correlated Electrons | cond-mat.mes-hall cond-mat.str-el | Abstract: | The average electron spin-polarization $cal P$ of two-dimensional electron gas confined in $
m GaAs/GaAlAs$ multiple quantum-wells was measured by nuclear magnetic resonance (NMR) near the fractional quantum Hall state with filling factor $
u={2/3}$. Above this filling factor (${{2/3}} leq
u < 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 $
u ={{2/3}}$, where a quantum phase transition from a partially polarized (${cal P} approx {{3/4}}$) to a fully polarized (${cal P} = 1$) state can be driven by increasing the ratio between the Zeeman and the Coulomb energy above a critical value $eta_{c} = frac{Delta_{Z}}{Delta_{C}} = 0.0185$. | Source: | arXiv, cond-mat/0105590 | Services: | Forum | Review | PDF | Favorites |
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