Ultrafast dynamics of coherences in the quantum Hall system

Details Ultrafast dynamics of coherences in the quantum Hall system Ultrafast dynamics of coherences in the quantum Hall system

2006-07-21

arxiv.org/abs/cond-mat/0607545v1

Phys. Rev. Lett. 97, 057401 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.97.057401

Using three-pulse four-wave-mixing optical spectroscopy, we study the ultrafast dynamics of the quantum Hall system. We observe striking differences as compared to an undoped system, where the 2D electron gas is absent. In particular, we observe a large off-resonant signal with strong oscillations. Using a microscopic theory, we show that these are due to many-particle coherences created by interactions between photoexcited carriers and collective excitations of the 2D electron gas. We extract quantitative information about the dephasing and interference of these coherences.

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