Coulomb-Interaction Induced Coupling Of Landau Levels In Intrinsic And Modulation-Doped Quantum Wells

Abstract

We have performed two-dimensional Fourier transform spectroscopy on intrinsic and modulation doped quantum wells in external magnetic fields up to 10 T. In the undoped sample, the strong Coulomb interactions and the increasing separations of the electron and hole charge distributions with increasing magnetic fields lead to a nontrivial in-plane dispersion of the magneto-excitons. Thus, the discrete and degenerate Landau levels are coupled to a continuum. The signature of this continuum is the emergence of elongated spectral line shapes at the Landau level energies, which are exposed by the multidimensional nature of our technique. Surprisingly, the elongation of the peaks is completely absent in the lowest Landau level spectra obtained from the modulation doped quantum well at high fields.

Publication Date

6-28-2017

Publication Title

Physical Review B

Volume

95

Issue

24

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1103/PhysRevB.95.245314

Socpus ID

85023185654 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85023185654

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