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Ultrafast dynamics of the coherences in a quantum Hall system

By Keshav Dani, Jérôme Tignon, Michael Breit, Daniel S. Chemla, Eleftheria Kavousanaki and Ilias E. Perakis

Abstract

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

Topics: 78.47.+p, 42.50.Md, 73.20.Mf, 78.67.De, [PHYS.COND.CM-GEN] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]
Publisher: American Physical Society
Year: 2006
OAI identifier: oai:HAL:hal-00110001v1
Provided by: Hal-Diderot
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