Mechanisms of electron-phonon coupling unraveled in momentum and time: The case of soft phonons in TiSe <sub>2</sub>
Martin R. Otto, Jan-Hendrik Pöhls, Laurent P. René de Cotret, Mark J. Stern, Mark Sutton, Bradley J. Siwick
Abstract
to the selective photo-doping of carriers into the electron pocket at the Fermi level. Quasi-impulsive and wave vector-specific renormalization of soft zone-boundary phonon frequencies (stiffening) is observed, followed by wave vector-independent electron-phonon equilibration. These results unravel the underlying mechanisms driving the phonon softening that is associated with the charge density wave transition at lower temperatures.
Topics & Concepts
Condensed matter physicsPhononRenormalizationCoupling (piping)PhysicsCharge density waveMomentum (technical analysis)SofteningScatteringElectronCharge carrierCharge (physics)Soft modesUltrashort pulseFermi Gamma-ray Space TelescopeFermi levelInelastic scatteringFermi gasDensity of statesPhonon scatteringRenormalization groupBallistic conduction2D Materials and ApplicationsTopological Materials and PhenomenaOrganic and Molecular Conductors Research