Ultrafast dynamics of coherences in a quantum Hall system

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....

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Bibliographic Details
Published in:	Physical review letters Vol. 97; no. 5; p. 057401
Main Authors:	Dani, K M, Tignon, J, Breit, M, Chemla, D S, Kavousanaki, E G, Perakis, I E
Format:	Journal Article
Language:	English
Published:	United States American Physical Society 04-08-2006
Subjects:	Condensed Matter Other Physics
Online Access:	Get full text
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Summary:	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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.97.057401