Ultrafast charge dynamics in photoexcitedNd2CuO4andLa2<

Witnessing the formation and relaxation of dressed quasi-particles in a strongly correlated electron system

“…This behaviour can be ascribed to a 'thermal response', that is, it is compatible with the shift towards lower energies of the CTP on heating 27,30,31 as seen in Fig. 1.…”

“…Second, our model does not include the free charge in excess present in the experimental sample. In addition to this, we highlight that the model is provided at T ¼ 0 K while it is well known that the CT gap in La 2 CuO 4 shifts to higher energies on cooling [30][31][32] .…”

“…The HHH represents a standard approach for underdoped cuprates where the insulating state arises from the strong repulsion between the electrons. By taking into account both onsite Coulomb repulsion U and an effective electron-boson interaction 30 , the HHH can reproduce the equilibrium optical properties of cuprates both undoped and with tiny doping 13 and rationalizes the presence of tail states responsible for the broad below-gap absorption 13,27,33 . We argue that these tail states are responsible for the non-adiabatic contribution for sub-gap pumping and for the linearity of the optical response as a function of pump fluence (see Methods).…”

Dynamics of screening in photodoped Mott insulators

“…A conceptually rather simple example of a pulse induced nonequilibrium phase transition is the photodoping of a Mott insulator [6][7][8][9]. In these experiments, a pulse with frequency larger than the Mott gap produces doublon-hole pairs and hence results in a nonthermal conducting state.…”

“…II C. From the Dyson equations (9) and (10), we obtain the self-energies and , and the EDMFT approximation identifies these with the lattice self-energies. The solution of the lattice Dyson equations…”