Magneto-optics in transition metal diselenide monolayers

By Gang Wang, L. Bouet, M. Glazov, T. Amand, E. Ivchenko, É. Palleau, Xavier Marie, Bernhard Urbaszek. 2015

147 citations recorded by the source corpus.

We perform photoluminescence experiments at 4 K on two different transition metal diselenide monolayers (MLs), namely MoSe2 and WSe2 in magnetic fields Bz up to 9 T applied perpendicular to the sample plane. In MoSe2 MLs the valley polarization of the neutral and the charged exciton (trion) can be tuned by the magnetic field, independent of the excitation laser polarization. In the investigated WSe2 ML sample the evolution of the trion valley polarization depends both on the applied magnetic field and the excitation laser helicity, while the neutral exciton valley polarization depends only on the latter. Remarkably, we observe a reversal of the sign of the trion polarization between WSe2 and MoSe2. For both systems we observe a clear Zeeman splitting for the neutral exciton and the trion of about ±2 meV at B z ∓ 9 ?> T. The extracted Landé-factors for both exciton complexes in both materials are g ≈ − 4 ?> .

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/ee7836acbb819fc6ed6e0a2a59ea86620cbc4608

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In Atomic and Molecular Physics, and Optics

In Materials Chemistry

Citations in the corpus

Optical properties of atomically thin transition metal dichalcogenides: observations and puzzles (2016, background): “The observed excitonic g-factors remain controversial as they are not soundly accounted for by the band structure models, which, in the ultimate case, imply even practically vanishing excitonic Zeeman effect, in strike contrast to the experimental data [97] (notably, the fact that the excitonic wave”
Excitonic linewidth approaching the homogeneous limit in MoS2-based van der Waals heterostructures (2017, background): “The g factor, closely related to the effective mass tensor, also gives a fingerprint of the impact of different bands on the optical transitions [45,48,84].”