Polarizability, plasmons, and screening in 1T′-MoS2 with tilted Dirac bands

In the presence of an external vertical electric field and strain, it is evident that 1T′-MoS2 exhibits tilted Dirac bands which are valley-spin-polarized. Additionally, this material experiences a topological phase change between a topological insulator and band insulator for a critical value of th...

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Bibliographic Details
Published in:Physics letters. A 2022-10, Vol.449, p.128353, Article 128353
Main Authors: Balassis, Antonios, Gumbs, Godfrey, Roslyak, Oleksiy
Format: Article
Language:English
Subjects:
Friedel oscillation
Plasmons
Spin-1 fermions
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Summary:In the presence of an external vertical electric field and strain, it is evident that 1T′-MoS2 exhibits tilted Dirac bands which are valley-spin-polarized. Additionally, this material experiences a topological phase change between a topological insulator and band insulator for a critical value of the electric field. Using linear response theory, we calculated the polarization function which is in turn employed to obtain the dielectric function. This latter quantity is subsequently utilized in calculations to determine the plasmons dispersion relation, their decay rate and impurity screening corresponding to various levels of doping, the critical applied vertical electric field strengths and the spin-orbit coupling gap in 1T′-MoS2 with tilted Dirac bands. •Polarization function for tilted Dirac fermion materials.•Anisotropy of transverse magnetic modes.•Analytic expressions for the plasmon excitations.•Static shielding of impurities.•Landau damping of plasmons and the calculated decay rates.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2022.128353