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Weakly damped acoustic plasmon mode in transition metal dichalcogenides with Zeeman splitting
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. University of Maryland, United States .ORCID iD: 0000-0002-6166-181X
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
Abstract [en]

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.
Keyword [en]
Valley Polarization, Graphene Plasmons, MOS2, Layer
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-149219DOI: 10.1103/PhysRevB.89.235420ISI: 000339049300004Scopus ID: 2-s2.0-84902578944OAI: oai:DiVA.org:kth-149219DiVA: diva2:738716
Note

QC 20140819

Available from: 2014-08-19 Created: 2014-08-18 Last updated: 2017-12-05Bibliographically approved

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Abergel, David

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