Weakly damped acoustic plasmon mode in transition metal dichalcogenides with Zeeman splitting

We analyze the effect of a strong Zeeman field on the spectrum of collective excitations of monolayer transition metal dichalcogenides. The combination of the Dresselhaus-type spin-orbit coupling and an external Zeeman field results in the lifting of the valley degeneracy in the valence band of thes...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-06, Vol.89 (23), p.235420, Article 235420
Main Authors: Kechedzhi, K., Abergel, D. S. L.
Format: Article
Language:English
Subjects:
Condensed matter
Dispersions
Electron gas
Excitation spectra
Graphene Plasmons
Hoisting
Landau damping
Layer
MOS2
Plasmons
Transition metals
Valley Polarization
Valleys
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Summary:We analyze the effect of a strong Zeeman field on the spectrum of collective excitations of monolayer transition metal dichalcogenides. The combination of the Dresselhaus-type spin-orbit coupling and an external Zeeman field results in the lifting of the valley degeneracy in the valence band of these crystals. We show that this lifting of the valley degeneracy manifests in the appearance of an additional plasmon mode with linear in wave-number dispersion along with the standard square root in wave-number mode. Despite this novel mode being subject to Landau damping, it corresponds to a well-defined quasiparticle peak in the spectral function of the electron gas.
ISSN:1098-0121
1550-235X
1550-235X
DOI:10.1103/PhysRevB.89.235420