Nonlinear Optical studies of the Transient Coherence in the Quantum Hall System

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dc.creatorDani, K. M.
dc.creatorKavousanaki, E. G.
dc.creatorTignon, J.
dc.creatorChemla, D. S.
dc.creatorPerakis, I. E.
dc.date2006-07-21
dc.date.accessioned2026-07-07T09:54:36Z
dc.date.available2026-07-07T09:54:36Z
dc.descriptionWe review recent investigations of the femtosecond non-linear optical response of the two-dimensional electron gas (2DEG) in a strong magnetic field. We probe the Quantum Hall (QH) regime for filling factors $ν\sim 1$. Our focus is on the transient coherence induced via optical excitation and on its time evolution during early femtosecond timescales. We simultaneously study the interband and intraband coherence in this system by using a nonlinear spectroscopic technique, transient three-pulse four wave mixing optical spectroscopy, and a many-body theory. We observe striking differences in the temporal and spectral profile of the nonlinear optical signal between a modulation doped quantum well system (with the 2DEG) and a similar undoped quantum well (without a 2DEG). We attribute these qualitative differences to Coulomb correlations between the photoexcited electron-hole pairs and the 2DEG. We show, in particular, that intraband many-particle coherences assisted by the inter-Landau-level magnetoplasmon excitations of the 2DEG dominate the femtosecond nonlinear optical responce. The most striking effect of these exciton-magnetoplasmon coherences is a large off-resonant four-wave-mixing signal in the case of very low photoexcited carrier densities, not observed in the undoped system, with strong temporal oscillations and unusually symmetric temporal profile.
dc.description22 pages, 9 figures; review article to be published in Solid State Communications
dc.identifierhttps://arxiv.org/abs/cond-mat/0607550
dc.identifierhttp://arxiv.org/abs/cond-mat/0607550
dc.identifierSolid State Commun. 140 (2), 72-82 (2006)
dc.identifierdoi:10.1016/j.ssc.2006.05.051
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/166371
dc.subjectMesoscale and Nanoscale Physics
dc.titleNonlinear Optical studies of the Transient Coherence in the Quantum Hall System
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