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APS » Journals » Phys. Rev. Lett. » Volume 102 » Issue 12
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Phys. Rev. Lett. 102, 126806 (2009) [4 pages]

Optical Absorption to Probe the Quantum Hall Ferromagnet at Filling Factor ν=1

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P. Plochocka*, J. M. Schneider, D. K. Maude, and M. Potemski
Laboratoire National des Champs Magnétiques Intenses, Grenoble High Magnetic Field Laboratory, CNRS, 38042 Grenoble, France

M. Rappaport, V. Umansky, and I. Bar-Joseph
Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot, Israel

J. G. Groshaus, Y. Gallais†, and A. Pinczuk
Department of Physics and of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA

Received 23 January 2009; published 25 March 2009

See accompanying Physics Synopsis

Optical absorption measurements are used to probe the spin polarization in the integer and fractional quantum Hall effect regimes. The system is fully spin polarized only at filling factor ν=1 and at very low temperatures (∼40  mK). A small change in filling factor (δν≈±0.01) leads to a significant depolarization. This suggests that the itinerant quantum Hall ferromagnet at ν=1 is surprisingly fragile against increasing temperature, or against small changes in filling factor.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.126806
DOI:
10.1103/PhysRevLett.102.126806
PACS:
73.43.Lp, 78.67.−n

*Paulina.Plochocka@grenoble.cnrs.fr

†Current address: LMPQ, Université Paris Diderot, 75205 Paris, France.

 
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