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Quantum Hall Effects

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Integer and fractionnal quantum Hall effects oberved in magneto-transport measurements.

- Using inelastic light (or Raman) scattering we are probing the low energy collective excitations of 2D electron gas under high magnetic field and at very low temperature (T<100mK). Our group is collaborating with Columbia University and Alcatel-Lucent (USA) on this topic which requires the highest mobility GaAs samples and an unique very low temperature optical facility.

- Skyrmion ordering

We are currently focusing on the physics of topological objects called skyrmions and on the possibility of observing a Skyrme crystal.

Spatial distribution of the spin orientations in a spin-charge texture known as skyrmions.

References :

- H.L. Stormer and D.C. Tsui,
Perspectives in Quantum Hall Effects

- Y. Gallais, T. H. Kirschenmann, I. Dujovne, C. F. Hirjibehedin, A. Pinczuk, B. S. Dennis, L. N. Pfeiffer, and K.W. West, Phys. Rev. Lett. 97, 36804 (2006).

- Y. Gallais, J. Yan, A. Pinczuk, L.N. Pfeiffer et K.W. West, Phys. Rev. Lett. 100, 086806 (2008)

- T.H.R. Skyrme, Proc. Roy. Soc. London (A) 260, 127 (1961)

- S.L. Sondhi et al., Physical Review B 47, 16419 (1993).