Workgroup Prof. Aeschlimann

Dr. Benjamin Stadtmüller

Scientific group leader, Department of Physics

Mail:                     bstadtmueller@physik.uni-kl.de

Phone:                 +49631205-2344

Office:                  46-461

Researcher ID:    B-2297-2015

 

          

News

New preprint on arXiv.org

Getting smaller and faster – these are the two major challenges in the field of spintronics that aims at devising novel concepts for the next generation of information technology applications. In our quest to push the temporal limits of the optical manipulation of materials, we recently demonstrated an optical reduction of the antiferromagnetic order of the insulating NiO thin film on a yet unprecedented, (sub)picosecond timescale. This extremely fast spin dynamics of the NiO thin films covered by an ultrathin Pt layer is attributed to an ultrafast and highly efficient energy transfer from the optically excited electron system of the Pt layer into the NiO spin system. More details on our recent work can be found here:

  • Indirect optical manipulation of the antiferromagnetic order of insulating NiO by ultrafast interfacial energy transfer
    S. Wust et al. arXiv:220502686

 

Latest Research Accepted for Publication in the Journal of Physical Chemistry Letters.

Spin filtering can also be observed in point-chiral molecules!

Spin filtering is one of the most crucial functionalities in all spintronic applications. In molecular materials, spin filtering can, for instance, be medicated by the chiral induced spin selectivity (CISS) effect. In our work, we uncovered that CISS is not limited to structurally helical, DNA-like molecules, but can also be observed for point-chiral molecules on natural chiral surfaces. Most importantly, we find a spin-dependent electron transmission through a single layer of the point-chiral molecules that depends on all three components of the electrons’ spin. To learn more about the vectoral spin filtering in all-chiral molecule-metal heterostructures, check out our latest work:

  • Vectorial Electron Spin Filtering by an All-Chiral Metal-Molecular Heterostructure
    C. B. Viswanatha, J. Stöckl, B. Arnoldi, S. Becker, M. Aeschlimann, B. Stadtmüller
    J. Phys. Chem. Lett. [DOI: 10.1021/acs.jpclett.2c00983]

 

Main Research Interests

Band Structure Engineering of (Molecular) Hybrid Systems

Metal-organic hybrid systems consisting of

  • Hydrocarbon molecules
  • Fullerenes and endohedral fullerenes
  • Spin-textured or magnetic surface alloys
  • Spin-textured or magentic quantum well systems

Hot Carrier Dynamics in (Molecular) Solids and Hybrid Systems

  • Momentum space scattering of hot carriers in metals and low dimensional materials
  • Charge transfer dynamics and spin injection at metal-organic hybrid systems
  • Dynamics of charge transfer and Frenkel excitons in molecular materials
  • Intramolecular charge transfer phenomena in metal-carrying molecular complexes

    Manipulation of Magnetic Materials

    • Ultrafast magentization dynamics
    • Optically-induced spin transport and spin transfer phenomena

    Current Projects

    Spin + Phase-Change: Competing interactions of spin with charge and lattice, Project A02 in the SFB/TRR 173 Spin+X

    Spin + Non-Equilibrium: Ultrafast non-equilibrium spin and charge transport, Project B03 in the SFB/TRR 173 Spin+X

    Spin + Coupling Control:Control of spin-spin interactions in hybrid layer systems, Project B05 in the SFB/TRR 173 Spin+X

    Lectures @ Johannes Gutenberg University Mainz

    SS 2022:  Experimentalphysik 5c, Physik kondensierter Materie

    This introductory lecture into Condensed Matter Physics consists of a combination of classical lectures (Thu, 10:15.-11:45, Lorentz-Raum, 05-127, JGU M) and integrated "inverted classroom" teaching/ excercises in presence (Tue, 8:30-10:00, Lorentz-Raum, JGU M). The details regarding this concept will be presented in the introductory lecture on Tuesday, 19.4., 09:15 (no inverted classroom/ exercises in the first week).

    This lecture is given by 
    apl. Prof. Martin Jourdan, main part
    Dr. Sonka Reimers
    Dr. Benjamin Stadtmüller
    Prof. Thomas Palberg, guest lecturer "soft matter"

    More information for students of the JGU M can be found in the LMS Moodle course.

     

    Selected Publications

    2022

    • Observation of optical coherence in a disordered metal–molecule interface by coherent optical two-dimensional photoelectron spectroscopy
      M. Aeschlimann, T. Brixner, M. Cinchetti, M. Feidt, N. Haag, M. Hensen, B. Huber, T. Kenneweg, J. Kollamana, C.Kramer, W.Pfeiffer, S. Ponzoni, B Stadtmüller, P. Thielen
      Phys. Rev. B. 105, 205415 (2022)
    • Atomic and mesoscopic structure of Dy-based surface alloys on noble metals
      S. Mousavion, K. M. Yu, M. Maniraj, L. Lyu, J. Knippertz, B. Stadtmüller, M. Aeschlimann
      New J. Phys. 24, 033048 (2022)
    • Role of primary and secondary processes in the ultrafast spin dynamics of nickel
      M. Stiehl, M. Weber, C. Seibel, J. Hoefer, S. T. Weber, D. M. Nenno, H. C. Schneider, B. Rethfeld, B. Stadtmüller, M. Aeschlimann
      Appl. Phys. Lett., 120, 062410 (2022)

    2021

    • Energy and Momentum Distribution of Surface Plasmon-Induced Hot Carriers Isolated via Spatiotemporal Separation
      M. Hartelt, P. N. Terekhin, T. Eul, A.-K. Mahro, B. Frisch, E. Prinz, B. Rethfeld, B. Stadtmüller, M. Aeschlimann
      ACS Nano 15, 19559 – 19569 (2021)
    • Spectroscopic Evidence for a New Type of Surface Resonance at Noble-Metal Surfaces
      T. Eul, J. Braun, B. Stadtmüller, H. Ebert, M. Aeschlimann
      Phys. Rev. Lett. 127, 196405 (2021)
    • Momentum and energy dissipation of hot electrons in a Pb/Ag(111) quantum well system
      F. Haag, T. Eul, L. Grad, N. Haag, J. Knippertz, M. Cinchetti, M. Aeschlimann, B. Stadtmüller
      Phys. Rev. B 104, 104308 (2021)
    • Mobilization upon Cooling
      S. Aeschlimann, L. Lyu, S. Becker, S. Mousavion, T. Speck, H.-J. Elmers, B. Stadtmüller, M. Aeschlimann, R. Bechstein, A. Kühnle
      Angew. Chem. Int. Ed. 60, 19117–19122 (2021)
    • The 2021 Ultrafast Spectroscopic Probes of Condensed Matter Roadmap –
      Chapter 8: Ultrafast Momentum Microscopy – A new approach for ultrafast band structure imaging

      B. Stadtmüller
      J. Phys.: Condens. Matter 33 (2021) 353001 - chapter 8

    2020

    • Vertical bonding distances and interfacial band structure of PTCDA on a Sn-Ag surface alloy
      J. Knippertz, L. L. Kelly, M. Franke, C. Kumpf, M. Cinchetti, M. Aeschlimann, and B. Stadtmüller
      Phys. Rev. B 102, 075447 (2020)
    • Signitures of an atomic crystal in the band structure of a C60 thin film
      N. Haag, D. Lüftner, F. Haag, J. Seidel, L.L. Kelly, G. Zamborlini, M. Jugovac, V. Feyer, M. Aeschlimann, P. Puschnig, M. Cinchetti, and B. Stadtmüller
      Phys. Rev. B 101, 165422 (2020)
    • Direct evidence for efficient ultrafast charge separation in epitaxial WS2/graphene heterostructures
      S. Aeschlimann, A. Rossi, M. Chávez-Cervantes, R. Krause, B. Arnoldi, B. Stadtmüller, M. Aeschlimann, S. Forti, F. Fabbri, C. Coletti, I. Gierz
      Sci. Adv. 2020; 6 : eaay0761
    • Ultrafast magnetization dynamics of Mn-doped L10 FePt with spatial inhomogeneity
      Y. Liu, U. Bierbrauer, C. Stick, S. T. Weber, M. Hofherr, N. Y. Schmidt, M. Albrecht, D. Steil, S. Mathias, H. C. Schneider, B. Rethfeld, B. Stadtmüller, M. Aeschlimann
      Journal of Magnetism and Magnetic Materials 502, 166477 (2020)
    • Tailoring molecular island shapes: influence of microscopic interaction on mesostructure
      S. Aeschlimann, L. Lyu, B. Stadtmüller, M. Aeschlimann, and A. Kühnle
      Nano Research, 13, 843-852 (2020)
    • Ultrafast optically induced spin transfer in ferromagnetic alloys
      M. Hofherr, S. Häuser, J. K. Dewhurst, P. Tengdin, S. Sakshath, H. T. Nembach, S. T. Weber, J. M. Shaw, T. J. Silva, H. C. Kapteyn, M. Cinchetti, B. Rethfeld, M. M. Murnane, D. Steil, B. Stadtmüller, S. Sharma, M. Aeschlimann, S. Mathias
      Sci. Adv. 2020; 6: eaay8717

     2019

    • Thermal-driven Formation of 2D Nano-porous Networks on Metal Surfaces
      L. Lyu, M. Maniraj, S. Mousavion, S. Becker, H. Huang, M. Aeschlimann, B. Stadtmüller
      J. Phys. Chem. C, 123, 43, 26263-26271 (2019)
    • Time-resolved two-photon momentum microscopy– A new approach to study hot carrier lifetimes in momentum space
      F. Haag, T. Eul, P. Thielen, N. Haag., B. Stadtmüller, M. Aeschlimann
      Rev. Sci. Instrum. 90, 103104 (2019); and highlighted in Scilight 2019, 411103 (2019)
    • Modification of Pb quantum well states by the adsorption of organic molecules
      B. Stadtmüller, L. Grad, J. Seidel, F. Haag, N. Haag, M. Cinchetti, M. Aeschlimann
      J. Phys.: Condens. Matter 31, 134005 (2019)
    • Strong modification of the transport level alignment in organic materials after optical excitation
      B. Stadtmüller, S. Emmerich, D. Jungkenn, N. Haag, M. Rollinger, S. Eich, M. Maniraj, M. Aeschlimann, M. Cinchetti, S. Mathias
      Nat. Commun. 10, 1470 (2019)

    2018

    • Structure and electronic properties of the (√3×√3) R30° SnAu2/Au(111) surface alloy
      M. Maniraj, D. Jungkenn, W. Shi, S. Emmerich, L. Lyu, J. Kollamana, Z. Wei, B. Yan, M. Cinchetti, S. Mathias, B. Stadtmüller, M. Aeschlimann
      Phys. Rev. B 98, 205419 (2018)
    • Adsorption induced distortion of the tri-metallic nitride core of the endohedral fullerene Sc3N@C80 on the Ag(111) surface
      J. Seidel, L. L. Kelly, M. Franke, C. Kumpf, M. Cinchetti, M. Aeschlimann, B. Stadtmüller
      Phys. Rev. B 98, 085434 (2018)
    • Spin- and Angle-Resolved Photoemission Study of The Alq3/Co Interface
      J. Stöckl, A. Jurenkow, N. Großmann, M. Cinchetti, B. Stadtmüller, M. Aeschlimann
      J. Phys. Chem. C, 122, 6585-6592 (2018)

    2017

    • Speed and efficiency of femtosecond spin current injection into a non-magnetic material
      M. Hofherr, P. Maldonado, O. Schmitt, M. Berritta, U. Bierbrauer, S. Sadashivaiah, A.J. Schellekens, B. Koopmans, D. Steil, M. Cinchetti, B. Stadtmüller, P.M. Oppeneer, S. Mathias, M. Aeschlimann,
      Phys. Rev. B 96, 100403(R) (2017)
    • Ultrafast magnetization dynamics in Nickel: impact of pump photon energy
      U. Bierbrauer, S. T. Weber, D. Schummer, M. Barkowski, A.-K. Mahro, S. Mathias, H.-C. Schneider, B. Stadtmüller, M. Aeschlimann, B. Rethfeld,
      J. Phys.: Condens. Matter. 29, 244002 (2017)
    • Band structure evolution during the ultrafast ferromagnetic-paramagnetic phase transition in cobalt
      S. Eich, M. Plötzing, M. Rollinger, S. Emmerich, R. Adam, C. Chen, H. C. Kapteyn, M. M. Murnane, L. Plucinski, D. Steil, B. Stadtmüller, M. Cinchetti, M. Aeschlimann, C. M. Schneider, S. Mathias
      Sci. Adv. 3 e1602094 (2017)

    2016

    • Epitaxial growth of thermally stable cobalt films on Au(111)
      N. Haag, M. Laux, J. Stöckl, J. Kollamana, J. Seidel, N. Großmann, R. Fetzer, L. L. Kelly, Z. Wei, B. Stadtmüller, M. Cinchetti, M. Aeschlimann,
      New J. Phys. 18, 103054 (2016)
    • Modifying the surface of a Rashba-split Pb-Ag alloy using tailored metal-organic bonds
      B. Stadtmüller, J. Seidel, N. Haag, L. Grad, C. Tusche, G. van Straaten, M. Franke, J. Kirschner, C. Kumpf, M. Cinchetti, M. Aeschlimann,
      Phys. Rev. Lett. 117, 096805 (2016)
    • Dynamic spin-filtering at the Co/Alq3 interface mediated by weakly coupled second layer molecules
      A. Droghetti, P. Thielen, I. Rungger, N. Haag, N. Großmann, J. Stöckl, B. Stadtmüller, M. Aeschlimann, S.Sanvito, M. Cinchetti,
      Nat. Commun. 7, 12668 (2016)
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