Coulomb-interaction induced coupling of Landau levels in intrinsic and modulation-doped quantum wells
| Autor: | Stephen McGill, D. McGinty, C. E. Stevens, John L. Reno, Haoxiang Zhang, Denis Karaiskaj, Ilias E. Perakis, Prasenjit Dey, David J. Hilton, Ryan P. Smith, Volodymyr Turkowski, J. Paul |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Condensed matter physics Degenerate energy levels 02 engineering and technology Landau quantization Electron Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology 01 natural sciences Spectral line Shubnikov–de Haas effect Magnetic field 0103 physical sciences Coulomb 010306 general physics 0210 nano-technology Quantum well |
| Zdroj: | Physical Review B. 95 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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