Observation of inter-Landau-level quantum coherence in semiconductor quantum wells

Details Observation of inter-Landau-level quantum coherence in semiconductor quantum wells Observation of inter-Landau-level quantum coherence in semiconductor quantum wells

2008-06-28

arxiv.org/abs/0806.4724v1

Phys. Rev. B 78, 041301(R) (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures, to appear in Phys. Rev. B Rapid Communications

Scientific paper

10.1103/PhysRevB.78.041301

Using three-pulse four-wave-mixing femtosecond spectroscopy, we excite a non-radiative coherence between the discrete Landau levels of an undoped quantum well and study its dynamics. We observe quantum beats that reflect the time evolution of the coherence between the two lowest Landau level magnetoexcitons. We interpret our observations using a many-body theory and find that the inter Landau level coherence decays with a new time constant, substantially longer than the corresponding interband magnetoexciton dephasing times. Our results indicate a new intraband excitation dynamics that cannot be described in terms of uncorrelated interband excitations.

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