Unknown

Dataset Information

0

Van der Waals driven anharmonic melting of the 3D charge density wave in VSe2.

ABSTRACT: Understanding of charge-density wave (CDW) phases is a main challenge in condensed matter due to their presence in high-Tc superconductors or transition metal dichalcogenides (TMDs). Among TMDs, the origin of the CDW in VSe2 remains highly debated. Here, by means of inelastic x-ray scattering and first-principles calculations, we show that the CDW transition is driven by the collapse at 110 K of an acoustic mode at qCDW = (2.25 0 0.7) r.l.u. The softening starts below 225 K and expands over a wide region of the Brillouin zone, identifying the electron-phonon interaction as the driving force of the CDW. This is supported by our calculations that determine a large momentum-dependence of the electron-phonon matrix-elements that peak at the CDW wave vector. Our first-principles anharmonic calculations reproduce the temperature dependence of the soft mode and the TCDW onset only when considering the out-of-plane van der Waals interactions, which reveal crucial for the melting of the CDW phase.

SUBMITTER: Diego J 

PROVIDER: S-EPMC7838422 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

Json Xml
altmetric image

Publications

van der Waals driven anharmonic melting of the 3D charge density wave in VSe<sub>2</sub>.

Diego Josu J   Said A H AH   Mahatha S K SK   Bianco Raffaello R   Monacelli Lorenzo L   Calandra Matteo M   Mauri Francesco F   Rossnagel K K   Errea Ion I   Blanco-Canosa S S  

Nature communications 20210126 1

Understanding of charge-density wave (CDW) phases is a main challenge in condensed matter due to their presence in high-Tc superconductors or transition metal dichalcogenides (TMDs). Among TMDs, the origin of the CDW in VSe<sub>2</sub> remains highly debated. Here, by means of inelastic x-ray scattering and first-principles calculations, we show that the CDW transition is driven by the collapse at 110 K of an acoustic mode at q<sub>CDW</sub> = (2.25 0 0.7) r.l.u. The softening starts below 225 K  ...[more]

Similar Datasets

Unknown Plasmons in the van der Waals charge-density-wave material 2H-TaSe<sub>2</sub>.
| S-EPMC7810790 | biostudies-literature
Unknown Direct Charge Trapping Multilevel Memory with Graphdiyne/MoS<sub>2</sub> Van der Waals Heterostructure.
| S-EPMC8564425 | biostudies-literature
Unknown Charge Transport Across Au-P3HT-Graphene van der Waals Vertical Heterostructures.
| S-EPMC9614726 | biostudies-literature
Unknown Indium-contacted van der Waals gap tunneling spectroscopy for van der Waals layered materials.
| S-EPMC8423830 | biostudies-literature
Unknown Reversible Electrical Control of Interfacial Charge Flow across van der Waals Interfaces.
| S-EPMC9999450 | biostudies-literature
Unknown Giant nonlinear optical wave mixing in a van der Waals correlated insulator.
| S-EPMC11296339 | biostudies-literature
Unknown Defect passivation of transition metal dichalcogenides via a charge transfer van der Waals interface.
| S-EPMC5650486 | biostudies-other
Unknown Supercurrent in van der Waals Josephson junction.
| S-EPMC4740878 | biostudies-other
Unknown Interplay between spin proximity effect and charge-dependent exciton dynamics in MoSe<sub>2</sub>/CrBr<sub>3</sub> van der Waals heterostructures.
| S-EPMC7691354 | biostudies-literature
Unknown Van der Waals negative capacitance transistors.
| S-EPMC6620276 | biostudies-literature