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

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

2006-07-21

arxiv.org/abs/cond-mat/0607550v1

Solid State Commun. 140 (2), 72-82 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

22 pages, 9 figures; review article to be published in Solid State Communications

Scientific paper

10.1016/j.ssc.2006.05.051

We 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 $\nu \sim 1$. 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.

Affiliated with

Also associated with

No associations

Rating

Nonlinear Optical studies of the Transient Coherence in the Quantum Hall System does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Nonlinear Optical studies of the Transient Coherence in the Quantum Hall System, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nonlinear Optical studies of the Transient Coherence in the Quantum Hall System will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-169599