Many-particle effects in optical transitions from zero-mode Landau levels in HgTe quantum wells

Sergey S. Krishtopenko (1) , Aleksandr Kadykov , S. Gebert , Sandra Ruffenach (1) , Christophe Consejo (1) , Jeremie Torres (2, 3) , Colin Avogadri (1) , Benoit Jouault (1) , Wojciech Knap (1) , N. N. Mikhailov , S. A. Dvoretskii , Frederic Teppe (1)

1 L2C - Laboratoire Charles Coulomb
2 IES - Institut d’Electronique et des Systèmes
3 TéHO - Térahertz, hyperfréquence et optique

We report on the far-infrared magnetospectroscopy of HgTe quantum wells with inverted band ordering at different electron concentrations. We particularly focus on optical transitions from zero-mode Landau levels, which split from the edges of electron-like and hole-like bands. We observe a pronounced dependence of the transition energies on the electron concentration varied by persistent photoconductivity effect. This is striking evidence that in addition to the already well-documented crystalline and interface asymmetries, electron-electron interactions also have a significant impact on the usual behavior of the optical transitions from zero mode Landau levels.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Sergey S. Krishtopenko, Aleksandr Kadykov, S. Gebert, Sandra Ruffenach, Christophe Consejo, et al.. Many-particle effects in optical transitions from zero-mode Landau levels in HgTe quantum wells. Physical Review B, 2020, 102 (4), pp.041404. ⟨10.1103/PhysRevB.102.041404⟩. ⟨hal-02919862⟩