Coherent modulation of the electron temperature and electron-phonon couplings in a 2D material.

ABSTRACT: Ultrashort light pulses can selectively excite charges, spins, and phonons in materials, providing a powerful approach for manipulating their properties. Here we use femtosecond laser pulses to coherently manipulate the electron and phonon distributions, and their couplings, in the charge-density wave (CDW) material 1T-TaSe₂ After exciting the material with a femtosecond pulse, fast spatial smearing of the laser-excited electrons launches a coherent lattice breathing mode, which in turn modulates the electron temperature. This finding is in contrast to all previous observations in multiple materials to date, where the electron temperature decreases monotonically via electron-phonon scattering. By tuning the laser fluence, the magnitude of the electron temperature modulati

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC7183179 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature