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24 April 2024

» pubmed » pmid17501371

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Absorption in the fractional quantum Hall regime: trion dichroism and spin polarization
J G Groshaus ; P Plochocka-Polack ; M Rappaport ; V Umansky ; I Bar-Joseph ; B S Dennis ; L N Pfeiffer ; K W West ; Y Gallais ; A Pinczuk ;
Date:	13 Apr 2007
Journal:	Phys Rev Lett, 98 (15), 156803
Abstract:	We present measurements of optical interband absorption in the fractional quantum Hall regime in a GaAs quantum well in the range 0<nu<or=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<or=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<or=nu<0.85 the 2DES remains partially polarized for the broad range of magnetic fields from 2.75 to 11 T. This is consistent with the presence of a mixture of polarized and depolarized regions.
Source:	PubMed, pmid17501371
Other source:	[GID 56298] cond-mat/0609674
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