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Equipment

Experimental tools Thanks to the financial contribution (global investment of about 900 k€) of two EQUIPEX, PATRIMEX and ATTOLab (“Investments for the Future”), during the review period LPMS acquired two state-of-the-art instruments: • the TOF-spin (Spin- and Angle Resolved Photoelectron Spectroscope) • the MesoXcope (PhotoElectron Emission Microscope, PEEM) • The TOF-Spin TOF-Spin is a new photoemission experimental setup now operational and installed at the Laser platform at UCP. This Angle-Resolved PhotoEmission Spectrometer (ARPES) has both, hemispherical and TOF electron analysers (SPECS GmbH) and the spectra can be recorded with X-rays (XPS) and with a high flux He lamp (UPS) as well as frequency tripled and quadrupled Ti-Sapphire-laser light. The hemispherical analyser is equipped with the Ferrum VLEED spin detector (FOCUS GmbH) with its proven 2D-CCD/3D-Spin Detector concept. Using a transfer lens with electrostatic 90° deflector and the patented (PCT/EP2011/070226) spin rotation lens, the Ferrum detector is able to perform a full 3D spin detection. In October 2015 the high efficiency of the spin detector was tested on the Rashba-split surface states of the Au(111) surface. The displayed spectra were obtained in about 30 minutes. The experimental chamber TOF-Spin will use also light from the Ti-sapphire laser chain producing pulses with a repetition rate of 250 kHz. The output is frequency tripled or quadrupled in order to obtain photons in the UV range (4.5 and 6.2 eV) suitable for PES experiments. The laser was acquired through support of PATRIMEX. The global cost of the Spin-ARPES spectrometer and the laser was about 800 k€. The TOF-Spin setup will regularly be installed on the already built Solid State beamline of the ATTOLab where a 10 kHz repetition rate (FAB10) is available. Based on the Ti-Sapphire laser technology, it will deliver 2 mJ, 20 fs, CEP stabilized pulses and after post-compression 5 fs pulses will be achieved. High-harmonics generation will ensure photon energies between 10 and about 100 eV. LPMS, as one of the partner laboratories of ATTOLab, is awarded 3 months/year access to the FAB 10 beamline at ATTOLab. The LPMS ARPES chamber has already been moved, in May 2018, to the facility for the first measurements. In the close future ATTOLab will be open to the international community of external users, similar to synchrotron radiation facilities. The user community will work on the end stations made available by partner laboratories. For LPMS this will be another opportunity to boost international collaborations. LPMS, as one of the partner laboratories of ATTOLab, is awarded 3 months/year access to the FAB 10 beamline at ATTOLab. The LPMS ARPES chamber has already been moved, in May 2018, to the facility for the first measurements. In the close future ATTOLab will be open to the international community of external users, similar to synchrotron radiation facilities. The user community will work on the end stations made available by partner laboratories. For LPMS this will be another opportunity to boost international collaborations.