English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Charge density wave (CDW) is a periodic modulation of electronic chargeleading to a reconstruction of the lattice, an emergence of zone folded modealong with collective excitations.1 Transition metal chalcogenides have shown agreat potential to study the underlying physics of multi body interactions likeelectron-phonon (e-ph) as well as plasmons-phonon coupling,2,3 excitoniccomplexes4 and CDW instabilities.5,6 We are elaborating on the collectiveexcitation and multiphonon interactions like amplitude, zone-folded and twophonon (2_ph) mode associated with CDW in 2H-TaS2 and 2H-NbSe2. The 2_ph is aunique excitation appears due to anharmonicity mediated longitudinal acousticmodes associated with the Kohn anomaly and provides a substantial evidences ofe-ph coupling.7 The experimental observations of anomalous response of 2_phmode across CDW is clarified with phonon self-energy formalism. Transportmeasurements shows that both materials exhibit incommensurate CDW (TI-CDW) at ~76 K (2H-TaS2) and ~ 30 K (2H-NbSe2). As revealed by the estimated e-phcoupling (l ~ 0.007 for 2H-NbSe2 and ~ 0.013 for 2H-TaS2) and anharmonicityconstant (d ~ 6.92 for 2H-NbSe2 and ~ 2.723 for 2H-TaS2), we emphasize onhigher e-ph coupling in 2H-TaS2 while larger anharmonicity 2H-NbSe2.

Multiphonon interactions and collective excitations in charge density wave of transition metal dichalcogenides