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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report the structural, vibrational and electrical transport properties upto 16 GPa of the 1T-TiTe2, a prominent layered 2D system, which is predicted toshow a series of topologically trivial - nontrivial transitions underhydrostatic compression. We clearly show signatures of two iso-structuraltransition at 2 GPa and 4 GPa obtained from the minima in c/a ratio concomitantwith the phonon linewidth anomalies of Eg and A1g modes at around the samepressures, providing strong indication of unusual electron-phonon couplingassociated to these transitions. Resistivity presents nonlinear behavior oversimilar pressure ranges providing a strong indication of the electronic originof these pressure driven isostructural transitions. Our data thus provide clearevidences of topological changes at A and L point of the Brillouin zonepredicted to be present in the compressed 1T-TiTe2. Between 4 GPa and 8 GPa,the c/a ratio shows a plateau suggesting a transformation from an anisotropic2D layer to a quasi 3D crystal network. First principles calculations suggestthat the 2D to quasi 3D evolution without any structural phase transitions ismainly due to the increased interlayer Te-Te interactions (bridging) via thecharge density overlap. In addition to the pressure dependent isostructuralphase transitions, our data also evidences the occurrence of a first orderstructural phase transition from the trigonal (P-3m1) phase at higherpressures. We estimate the start of this structural phase transition to be 8GPa and the symmetric of the new high-pressure phase to be monoclinic (C2/m).

Switching of the topologically trivial and non-trivial quantum phase transitions in compressed 1T-TiTe2: Experiments and Theory