Weakly damped acoustic plasmon mode in transition metal dichalcogenides with Zeeman splitting
2014 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 89, no 23, 235420- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2014. Vol. 89, no 23, 235420- p.
Valley Polarization, Graphene Plasmons, MOS2, Layer
IdentifiersURN: urn:nbn:se:kth:diva-149219DOI: 10.1103/PhysRevB.89.235420ISI: 000339049300004ScopusID: 2-s2.0-84902578944OAI: oai:DiVA.org:kth-149219DiVA: diva2:738716
QC 201408192014-08-192014-08-182014-08-19Bibliographically approved