N. Hofmann, L. Weigl, J. Gradl, N. Mishra, G. Orlandini, S. Forti, C. Coletti, S. Latini, L. Xian, A. Rubio, D. Perez Paredes, R. Perea Causin, S. Brem, E. Malic and I. Gierz: Link between interlayer hybridization and ultrafast charge transfer in WS2-graphene heterostructures
2D Mater. 10, 035025 (2023)
We have set up a narrowband THz source that will enable us to study the effects of resonant excitations in the few-tens-of-meV range.
We have assembled a transmission grating stretcher that allows us to tune the pulse duration of NIR pulses.
Official start of the collaborative research project "10Kelvin ToF Momentum Microscope for FLASH with Terahertz Excitation and Space-Charge Suppression" funded by the BMBF.
MIR pump 21.7eV probe tr-ARPES data on Sn-intercalated graphene on SiC(0001). The MIR wavelength was 6µm with a field strength of 1MV/cm at the focus. (a) Snapshot of the Dirac cone at negative pump-probe delay before the arrival of the MIR pump pulse. (b) Momentum-integrated energy distribution curve (red) extracted from (a) together with Fermi-Dirac fit (black) to determine the energy resolution of 90meV. (c) Pump-induced changes of the photocurrent with gain in red and loss in blue 100fs after excitation with MIR pump pulses. (d) Counts inside the black box in (c) as a function of pump-probe delay (red) together with fit to determine the temporal resolution of 220fs from the width of the rising edge.
We are now generating mid-infrared pump pulses from differency frequency generation in gallium selenide.
2eV pump 21.7eV probe tr-ARPES data on H-intercalated graphene on SiC(0001). (a) Snapshot of the Dirac cone at negative pump-probe delay before the arrival of the 2eV pump pulse. (b) Momentum-integrated energy distribution curve (red) extracted from (a) together with Fermi-Dirac fit (black) to determine the energy resolution of 185meV. (c) Pump-induced changes of the photocurrent with gain in red and loss in blue 50fs after excitation with 2eV pump pulses. (d) Counts inside the black box in (c) as a function of pump-probe delay (red) together with fit to determine the temporal resolution of 170fs from the width of the rising edge.
Official start of our project on nonequilibrium carrier dynamics in proximity-coupled graphene in the framework of RU 5242.
R. Krause, S. Aeschlimann, M. Chávez-Cervantes, R. Perea-Causin, S. Brem, E. Malic, S. Forti, F. Fabbri, C. Coletti, and I. Gierz: Microscopic Understanding of Ultrafast Charge Transfer in van der Waals Heterostructures
Phys. Rev. Lett. 127, 276401
Synchrotron ARPES data on heterostructure made of monolayer graphene and a 2D metallic Sn layer.
These are spectra of HHG emission from an Argon gas jet. The different plots represent different monochromator gratings, which offer different combinations of temporal resolution and energy resolution.
The tr-ARPES setup is fully reassembled. We are baking the ARPES chamber to reach the UHV regime.
Our completely finished lab building.
Congratulations to Dr. Razvan Krause for sucessfully defending his PhD thesis!
We have moved to our new lab building!
S. Aeschlimann, S. A. Sato, R. Krause, M. Chávez-Cervantes, U. De Giovannini, H. Hübener, S. Forti, C. Coletti, K. Hanff, K. Rossnagel, A. Rubio, I. Gierz: Survival of Floquet–Bloch States in the Presence of Scattering
Nano Lett. 2021, 21, 12, 5028–5035
We have started to assemble a HHG beamline for producing XUV probe pulses.
The optical tables in our new laboratory are installed.
Our first laser amplifier arrived!
R. Krause, M. Chávez-Cervantes, S. Aeschlimann, S. Forti, F. Fabbri, A. Rossi, C. Coletti, C. Cacho, Y. Zhang, P. E. Majchrzak, R. T. Chapman, E. Springate, I. Gierz: Ultrafast Charge Separation in Bilayer WS2/Graphene Heterostructure Revealed by Time- and Angle-Resolved Photoemission Spectroscopy
Frontiers in Physics 9, 2021
Official start of our ERC project DANCE
Construction of our new laser lab started in August 2020. This is how it looks today.
ERC project DANCE gets funded!