TY - CHAP A1 - Dröge, E. A1 - Böttcher, E. H. A1 - Kallakowski, St. A1 - Strittmatter, André A1 - Reimann, Olaf A1 - Steingrüber, R. A1 - Umbach, A. A1 - Bimberg, D. T1 - Distributed Millimeter-Wave InGaAs Metal-Semiconductor-Metal Photodetector T2 - Technical digest, International Topical Meeting on Microwave Photonics, MWP'98, 12 - 14 October 1998, Sarnoff Corporation, Princeton, New Jersey Y1 - 1998 SN - 0-7803-4936-9 SP - 173 EP - 176 PB - IEEE CY - Princeton, NJ ER - TY - CHAP A1 - Dröge, E. A1 - Böttcher, E. H. A1 - Kallakowski, St. A1 - Strittmatter, André A1 - Reimann, Olaf A1 - Steingrüber, R. A1 - Umbach, A. A1 - Bimberg, D. T1 - Ultrafast 1.55 µm Traveling-Wave MSM Photodetector Y1 - 1998 ER - TY - CHAP A1 - Dröge, E. A1 - Böttcher, E. H. A1 - Kallakowski, St. A1 - Strittmatter, André A1 - Reimann, Olaf A1 - Steingrüber, R. A1 - Umbach, A. A1 - Bimberg, D. T1 - Distributed MSM Photodetectors for the Long-Wavelength Range T2 - 24th European Conference on Optical Communication, September 20 - 24, 1998, Madrid, Spain, Vol. 1 Y1 - 1998 SN - 84-89900-14-0 SP - 57 EP - 58 PB - Telefónica de España CY - Madrid ER - TY - JOUR A1 - Dröge, E. A1 - Böttcher, E. H. A1 - Kallakowski, St. A1 - Bimberg, D. A1 - Reimann, Olaf A1 - Steingrüber, R. A1 - Strittmatter, André T1 - 78GHz distributed InGaAs MSM Photodetector JF - Electronics Letters Y1 - 1998 SN - 0013-5194 VL - 34 IS - 23 SP - 2241 EP - 2243 ER - TY - CHAP A1 - Kollakowski, St. A1 - Dröge, E. A1 - Böttcher, E. H. A1 - Strittmatter, André A1 - Reimann, Olaf A1 - Bimberg, D. T1 - Waveguide-Integrated InP/InGaAs/InAlGaAs MSM Photodetector for Operation at 1.3 and 1.55 nanometer Y1 - 1998 ER - TY - GEN A1 - Reimann, Ronny A1 - Rödiger, Stefan A1 - Stein, Erhard A1 - Kilian, Andrè A1 - Dittrich, Corinne A1 - Petrick, Ingolf T1 - Die Beschreibung der Fluiddynamik und der Lichtintensität im neuen MULT Reaktor KW - Photobioreaktor KW - Fluiddynamik KW - Lichtintensität Y1 - 2013 N1 - Algen und die globalen Megatrends, Tagungsband, 6. Bundesalgenstammtisch, 13. und 14. Mai 2013 Bürgerhaus Wilhelmsburg, Hamburg-Wilhelmsburg SP - S. 30 PB - DECHEMA CY - Frankfurt, M. ER - TY - GEN A1 - Angrick, Christoph A1 - Henriksen, Annika A1 - Mutzke, Nicole A1 - Reimann, Andre A1 - Ewert, Moritz A1 - Buß, Lars A1 - Falta, Jens A1 - Flege, Jan Ingo A1 - Donath, Markus T1 - Spin-polarized VLEED from single-layer MoS2/Au(111): Investigation of spin-orbit-induced effects T2 - Verhandlungen der DPG - SurfaceScience21 N2 - The influence of spin-orbit interaction on low-energy electron reflection from single-layer MoS2 on Au(111) was studied by VLEED (very-low-energy electron diffraction) [1,2]. The spin-dependent electron reflection was investigated for a wide range of electron incidence angles and kinetic energies. Since the adlayer coverage is about 30%, we studied the Au(111) substrate and a MoS2 bulk sample for comparison. This approach enabled us to distinguish between adlayer and substrate signals. For MoS2/Au(111), we detected a spin asymmetry of the reflected intensities, which shows a characteristic feature with alternating sign in the energy region of a VLEED fine structure [1]. The Au(111) substrate, in contrast, shows qualitatively different spin-asymmetry features, partially with reversed sign compared with MoS2/Au(111). The results of bulk MoS2 confirm that the characteristic feature in the single-layer data originates from MoS2. The influence of the adlayer-substrate interaction on the results will be discussed. [1] Burgbacher et al., Phys. Rev. B 87, 195411 (2013) [2] Angrick et al., J. Phys.: Condens. Matter 33, 115001 (2020) KW - Molybdenum disulfide (MoS2) KW - very-low-energy electron diffraction (VLEED) KW - spin-orbit interaction Y1 - 2021 UR - https://www.dpg-verhandlungen.de/year/2021/conference/surfacescience/part/o/session/78/contribution/3 VL - 2021 PB - Deutsche Physikalische Gesellschaft e.V. CY - Bad Honnef ER - TY - GEN A1 - Angrick, Christoph A1 - Thiede, Christian A1 - Reimann, Andre A1 - Henriksen, Annika A1 - Mutzke, Nicole A1 - Ewert, Moritz A1 - Buß, Lars A1 - Falta, Jens A1 - Flege, Jan Ingo A1 - Donath, Markus T1 - Spin-polarized very-low-energy electron diffraction from spin-orbit- and/or exchange-influenced targets T2 - Verhandlungen der DPG N2 - Exchange (XC) or spin-orbit (SOC) interaction cause electron scattering from surfaces to be spin dependent. The resulting spin filtering of the scattered electron beam can be used in spin-polarization analyzers. These analyzers are implemented in, for instance, photoemission setups to obtain spin resolution. Therefore, for promising targets, electron reflectivity and resulting spin asymmetry of very-low-energy electrons are measured for a wide range of incident electron energies and angles. By this, the investigated target is put to a test regarding the usability as a scattering target in a spin-polarization analyzer. Here, several results of SOC- as well as XC-influenced targets are presented. The results of the SOC-influenced targets Au(111), single-layer MoS2/Au(111) and W(110) [1] are compared with the results of the XC-influenced target Fe(001)-p(1x1)O [2]. Additionally, the influence of SOC interaction in the case of the XC-influenced target is investigated. The spin asymmetry caused by SOC is found to be one order of magnitude smaller than the spin asymmetry caused by XC. [1] Angrick et al., J. Phys.: Condens. Matter 33, 115001 (2020). [2] Thiede et al., Phys. Rev. Applied 1, 054003 (2014). KW - spin-polarization analysis KW - very-low-energy electron diffraction Y1 - 2023 UR - https://www.dpg-verhandlungen.de/year/2023/conference/skm/part/o/session/67/contribution/8 SN - 0420-0195 PB - Deutsche Physikalische Gesellschaft CY - Bad Honnef ER - TY - GEN A1 - Angrick, Christian A1 - Henriksen, Annika A1 - Edossa, Nicole A1 - Reimann, Andre A1 - Ewert, Moritz A1 - Buß, Lars A1 - Falta, Jens A1 - Flege, Jan Ingo A1 - Donath, Markus T1 - Transition metal dichalcogenide surfaces as scattering targets in spin-polarization detectors : a case study of MoS₂ T2 - Physical review B N2 - The suitability of transition metal dichalcogenides (TMDCs) for the use as scattering targets in electron spin-polarization detectors is put to a paradigmatic test: a case study of MoS₂ is performed. Therefore, the electron reflectivity, the Sherman function, and the figure of merit are measured for the following samples: a single layer of MoS₂ on Au(111) and cleaved MoS₂ single-crystal surfaces. MoS₂ offers promising features for the use in spin-polarization detection: working points with a reversed sign of the Sherman function and a long-term target stability. To overcome the low figure of merit of MoS₂, the closely-related 2D material WS₂ with higher spin-orbit interaction is proposed, which may resemble the promising features with higher Sherman function. This study demonstrates the potential suitability of 2D materials such as TMDCs as scattering targets in spin-polarization detectors. KW - Magnetism KW - Spin polarization KW - Spin-orbit coupling KW - Low-energy electron diffraction KW - Spin-resolved photoemission spectroscopy Y1 - 2025 U6 - https://doi.org/10.1103/fln2-pf6n SN - 2469-9950 VL - 112 IS - 23 SP - 1 EP - 11 PB - American Physical Society (APS) CY - College Park, Maryland ER -