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First-principles modelling for time-resolved ARPES under different pump-probe conditions
Umberto De Giovannini, Shunsuke A. Sato, Hannes Hübener +1
First-principles methods for time-resolved angular resolved photoelectron spectroscopy play a pivotal role in providing interpretation and microscopic understanding of the complex…
Phonon-Enhanced Nonlinearities in Hexagonal Boron Nitride
Jared S. Ginsberg, M. Mehdi Jadidi, Jin Zhang +10
We investigate optical nonlinearities that are induced and enhanced due to the strong phonon resonance in hexagonal boron nitride. We predict and observe large sub-picosecond durat…
Simulating terahertz field-induced ferroelectricity in quantum paraelectric SrTiO
Dongbin Shin, Simone Latini, Christian Schafer +5
Recent experiments have demonstrated that light can induce a transition from the quantum paraelectric to the ferroelectric phase of SrTiO. Here, we investigate this terahertz f…
Terahertz driven extremely nonlinear bulk photogalvanic currents in non-resonant conditions
Ofer Neufeld, Nicolas Tancogne-Dejean, Umberto De Giovannini +2
We report on the generation of bulk photocurrents in materials driven by non-resonant bi-chromatic fields that are circularly polarized and co-rotating. The nonlinear photocurrents…
Common microscopic origin of the phase transitions in TaNiS and the excitonic insulator candidate TaNiSe
Lukas Windgätter, Malte Rösner, Giacomo Mazza +5
The structural phase transition in TaNiSe has been envisioned as driven by the formation of an excitonic insulating phase. However, the role of structural and electronic in…
Phonoritons in a monolayer hBN optical cavity
Simone Latini, Umberto De Giovannini, Edbert J. Sie +3
A phonoriton is an elementary excitation that is predicted to emerge from hybridization between exciton, phonon and photon. Besides the intriguing many-particle structure, phonorit…