Many-particle hybridization of optical transitions from zero-mode Landau levels in HgTe quantum wells
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908955884650496 |
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| author | Ruffenach, S. Krishtopenko, S. S. Ikonnikov, A. V. Consejo, C. Torres, J. Baudry, X. Ballet, P. Jouault, B. Teppe, F. |
| author_facet | Ruffenach, S. Krishtopenko, S. S. Ikonnikov, A. V. Consejo, C. Torres, J. Baudry, X. Ballet, P. Jouault, B. Teppe, F. |
| contents | We present far-infrared magnetospectroscopy measurements of a HgTe quantum well in the inverted band structure regime over the temperature range of 2 to 60 K. The particularly low electron concentration enables us to probe the temperature evolution of all four possible optical transitions originating from zero-mode Landau levels, which are split off from the edges of the electron-like and hole-like bands. By analyzing their resonance energies, we reveal an unambiguous breakdown of the single-particle picture indicating that the explanation of the anticrossing of zero-mode Landau levels in terms of bulk and interface inversion asymmetries is insufficient. Instead, the observed behavior of the optical transitions is well explained by their hybridization driven by electron-electron interaction. We emphasize that our proposed many-particle mechanism is intrinsic to HgTe quantum wells of any crystallographic orientation, including (110) and (111) wells, where bulk and interface inversion asymmetries do not induce the anticrossing of zero-mode Landau levels. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_00565 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Many-particle hybridization of optical transitions from zero-mode Landau levels in HgTe quantum wells Ruffenach, S. Krishtopenko, S. S. Ikonnikov, A. V. Consejo, C. Torres, J. Baudry, X. Ballet, P. Jouault, B. Teppe, F. Mesoscale and Nanoscale Physics Materials Science We present far-infrared magnetospectroscopy measurements of a HgTe quantum well in the inverted band structure regime over the temperature range of 2 to 60 K. The particularly low electron concentration enables us to probe the temperature evolution of all four possible optical transitions originating from zero-mode Landau levels, which are split off from the edges of the electron-like and hole-like bands. By analyzing their resonance energies, we reveal an unambiguous breakdown of the single-particle picture indicating that the explanation of the anticrossing of zero-mode Landau levels in terms of bulk and interface inversion asymmetries is insufficient. Instead, the observed behavior of the optical transitions is well explained by their hybridization driven by electron-electron interaction. We emphasize that our proposed many-particle mechanism is intrinsic to HgTe quantum wells of any crystallographic orientation, including (110) and (111) wells, where bulk and interface inversion asymmetries do not induce the anticrossing of zero-mode Landau levels. |
| title | Many-particle hybridization of optical transitions from zero-mode Landau levels in HgTe quantum wells |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2507.00565 |