Absorption in the fractional quantum Hall regime: trion dichroism and spin polarization

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dc.creatorGroshaus, J. G.
dc.creatorPlochocka-Polack, P.
dc.creatorRappaport, M.
dc.creatorUmansky, V.
dc.creatorBar-Joseph, I.
dc.creatorDennis, B. S.
dc.creatorPfeiffer, L. N
dc.creatorWest, K. W.
dc.creatorGallais, Y.
dc.creatorPinczuk, A.
dc.date2006-09-26
dc.date.accessioned2026-07-07T08:49:07Z
dc.date.available2026-07-07T08:49:07Z
dc.descriptionWe present measurements of optical interband absorption in the fractional quantum Hall regime in a GaAs quantum well in the range 0 < nu < 1. We investigate the mechanism of singlet trion absorption, and show that its circular dichroism can be used as a probe of the spin polarization of the ground state of the two-dimensional electron system (2DES). We find that at nu = 1/3 the 2DES is fully spin-polarized. Increasing the filling factor results in a gradual depolarization, with a sharp minimum in the dichroism near nu = 2/3. We find that in the range 0.5 < nu < 0.85 the 2DES remains partially polarized for the broad range of magnetic fields from 2.75 to 11 Tesla. This is consistent with the presence of a mixture of polarized and depolarized regions.
dc.description4 pages, 4 figures (Fig 4 is in color)
dc.identifierhttps://arxiv.org/abs/cond-mat/0609674
dc.identifierhttp://arxiv.org/abs/cond-mat/0609674
dc.identifierPhys. Rev. Lett. 98, 156803 (2007)
dc.identifierdoi:10.1103/PhysRevLett.98.156803
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/144185
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStrongly Correlated Electrons
dc.titleAbsorption in the fractional quantum Hall regime: trion dichroism and spin polarization
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