In: Zeitschrift für Physikalische Chemie, 2017, vol. 231, no. 3, p. 527-543
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In: Nature Communications, 2020, vol. 11, no. 1, p. 4095
Charge excitations across an electronic band gap play an important role in opto- electronics and light harvesting. In contrast to conventional semiconductors, studies of above-band-gap photoexcitations in strongly correlated materials are still in their infancy. Here we reveal the ultrafast dynamics controlled by Hund’s physics in strongly correlated photoexcited NiO. By combining...
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In: Physical Review B, 2020, vol. 102, no. 8, p. 085148
The transition metal chalcogenide Ta2NiSe5 undergoes a second-order phase transition at Tc=328K involving a small lattice distortion. Below Tc, a band gap at the center of its Brillouin zone increases up to about 0.35 eV. In this work, we study the electronic structure of Ta2NiSe5 in its low-temperature semiconducting phase, using resonant inelastic x-ray scattering (RIXS) at the Ni L3 edge....
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In: The Journal of Chemical Physics, 2019, vol. 151, no. 6, p. 064119
We present calculated and measured elastic and vibrational excitation cross sections in benzene with the objective to assess the reliability of the theoretical method and to shed more light on how the electronic motion of the incoming electron is coupled with the nuclear motion of the vibrations. The calculation employed the discrete momentum representation method which involves solving the...
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In: Physical Review B, 2019, vol. 99, no. 18, p. 184303
We theoretically study the high-harmonic generation (HHG) in one-dimensional spin systems. While in electronic systems the driving by ac electric fields produces radiation from the dynamics of excited charges, we consider here the situation where spin systems excited by a magnetic field pulse generate radiation via a time- dependent magnetization. Specifically, we study the magnetic dipole...
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In: Journal of Electron Spectroscopy and Related Phenomena, 2019, vol. 233, p. 11–21
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In: Zeitschrift für Physikalische Chemie, 2015, vol. 229, no. 10-12, p. 1709-1728
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In: Zeitschrift für Physikalische Chemie, 2016, vol. 230, no. 4, p. 519-535
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In: Physical Review Letters, 2019, vol. 122, no. 10, p. 108002
We study experimentally the origin of heterogeneous dynamics in strongly driven glass-forming systems. Thereto, we apply a well-defined force with a laser line trap on individual colloidal polystyrene probe particles seeded in an emulsion glass composed of droplets of the same size. Fluid and glass states can be probed. We monitor the trajectories of the probe and measure displacements and...
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In: Physical Review B, 2019, vol. 99, no. 15, p. 155107
We investigate the excited state electronic structure of the model phase transition system In/Si(111) using femtosecond time- and angle-resolved photoemission spectroscopy (trARPES). An extreme ultraviolet 500 kHz laser source at 21.7 eV is utilized both to map the energy of excited states above the Fermi level and follow the momentum-resolved population dynamics on a femtosecond timescale....
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