Abstract
The nature of the couplings within and between lattice and charge degrees of freedom is central to the physics of materials. These interactions are essential to phenomena as diverse as superconductivity, charge density waves and carrier mobility in semiconductors and metals. Despite their fundamental role, detailed momentum-dependent information on the strength of electron-phonon coupling (EPC) and phonon-phonon coupling (PPC) across the entire Brillouin zone has proved to be very difficult to obtain experimentally. An emerging pump-probe technique, ultrafast electron diffuse scattering (UEDS), provides such information from the perspective of the phonon system directly. The application of this technique to EPC related phenomena in a wide variety of layered materials has recently been demonstrated.
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