Ultrafast dynamics of coherences in the quantum Hall system

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.

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

References in corpus (7)

• Topologically-Protected Qubits from a Possible Non-Abelian Fractional Quantum Hall State
• Coherence Network in the Quantum Hall Bilayer
• Splitting of Long-Wavelength Modes of the Fractional Quantum Hall Liquid at $\nu =1/3$
• Ultrafast Nonlinear Optical Response of Strongly Correlated Systems: Dynamics in the Quantum Hall Effect Regime
• Femtosecond Coherent Dynamics of the Fermi Edge Singularity and Exciton Hybrid
• Theory of ultrafast exciton dynamics in the Quantum Hall system
• Kinetics of four-wave mixing for a 2D magneto-plasma in strong magnetic fields

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• A table-top, repetitive pulsed magnet for nonlinear and ultrafast spectroscopy in high magnetic fields up to 30 T
• Observation of inter-Landau-level quantum coherence in semiconductor quantum wells