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

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

2006-09-26

arxiv.org/abs/cond-mat/0609674v1

Phys. Rev. Lett. 98, 156803 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures (Fig 4 is in color)

Scientific paper

10.1103/PhysRevLett.98.156803

We 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.

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