Dresden 2026 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 35: Optical Properties II
HL 35.3: Vortrag
Mittwoch, 11. März 2026, 17:00–17:15, POT/0251
Excited-state trions in a quantum well — Sourabh Jain1, Mikhail Glazov2, and •Ashish Arora1 — 1Indian Institute of Science Education and Research, Pune 411008 India — 2St. Petersburg, Russia
Recently, excited-states of trions were discovered in a layered semiconductor raising strong interest in many-body physics of Coulomb-bound quasiparticles in solids [1]. Here, we report on the observation of an excited 2s state of a trion in a GaAs quantum well (QW) using magneto-optical Kerr effect (MOKE) spectroscopy under out-of-plane magnetic fields up to 6 T [2]. This resonance appears slightly below the 2s exciton in energy. Strikingly, the 2s trion is found to be bound only for magnetic fields larger than 1 T. The signature of the 2s trion is absent in the magneto-reflectance spectra, while it is detectable in the MOKE spectra signifying the importance of the powerful technique. Similar to the 1s states, the 2s trion shows an opposite degree of magnetic-field-induced polarization compared to its exciton counterpart, in agreement with our theoretical calculations. This transfer of oscillator strength between the complexes establishes an optical fingerprint of the 2s excited trion. Our work addresses a four-decade old problem of excited-state trions in a quantum well, and opens scope for further investigations of many-body physics in solids. [1] Phys. Rev. Lett. 123, 167401 (2019) [2] Phys. Rev. Lett. 134, 246902 (2025)
Keywords: Trion; Quantum Well; Exciton; Layered Semiconductor; 2D materials