Overview of project B04
Non-Equilibrium Dynamics of the Phonon System
The excitation and decay of localized vibrations and phonons at the surface of a crystal lattice upon an optical excitation through a femtosecond laser pulse is studied by means of ultrafast electron diffraction with femtosecond temporal resolution. We focus on a fundamental understanding of mechanisms like electron-phonon coupling, which are responsible for the energy transfer from the electron system to the lattice system, phonon-phonon interaction, which causes mode conversion and thermalisation, and direct excitations, which result in an almost immediate stimulation of the lattice.
Ultrathin Pb(111) and Bi(111) films of few layer thickness on Si(111) substrates were used to study energy transfer from the electron system to the lattice system via electron-phonon coupling. While for Bi the bulk is heated up much faster on 3 ps timescale the response of the surface occurs delayed after 12 ps which is attributed to anharmonic coupling of the surface phonon modes to the bulk.
The phonon transport from ultrathin Pb(111) films across the interface into the Si substrate is – even for a thickness of 4 atomic layers – still governed by existing acoustic mismatch (AAM) or diffuse mismatch (DMM) model. Thus, finite size effects in nanoscale heat transport seems to be suppressed even for the thinnest films.
Publications
2024
Wei Lu, Matthieu Nicoul, Uladzimir Shymanovich, Alexander Tarasevitch, Michael Horn-von Hoegen, Dietrich von der Linde and Klaus Sokolowski-Tinten
A Modular Table-Top Setup for Ultrafast X-Ray Diffraction
Rev. Sci. Instrum. 95, 013002 (2024)
DOI: 10.1063/5.0181132
Fabian Thiemann, G. Sciaini, A. Kassen, T. S. Lott and Michael Horn-von Hoegen
Disentangling the Electronic and Lattice Contributions to the Dielectric Response of Photoexcited Bismuth
Phys. Rev. B 109, L041105 (2024)
DOI: 10.1103/PhysRevB.109.L041105
Michael Horn-von Hoegen
Structural Dynamics at Surfaces by Ultrafast Reflection High-Energy Electron Diffraction
Struct. Dyn. 11, 021301 (2024)
DOI: 10.1063/4.0000234
2023
Azize Koç, Isabel Gonzalez-Vallejo, Matthias Runge, Ahmed Ghalgaoui, Klaus Reimann, Laurenz Kremeyer, Fabian Thiemann, Michael Horn-von Hoegen, Klaus Sokolowski-Tinten, Michael Woerner and Thomas Elsaesser
Quantum Pathways of Carrier and Coherent Phonon Excitation in Bismuth
Phys. Rev. B 107, L180303 (2023)
DOI: 10.1103/PhysRevB.107.L180303
Matthias Runge, Ahmed Ghalgaoui, Isabel Gonzalez-Vallejo, Fabian Thiemann, Michael Horn-von Hoegen, Klaus Reimann, Michael Woerner and Thomas Elsaesser
Ultrafast Carrier Dynamics and Symmetry Reduction in Bismuth by Nonperturbative Optical Excitation in the Terahertz Range
Phys. Rev. B 107, 245140 (2023)
DOI: 10.1103/PhysRevB.107.245140
Karim Omambac, Marko A. Kriegel, Marin Petrović, Birk Finke, Christian Brand, Frank Meyer zu Heringdorf and Michael Horn-von Hoegen
Interplay of Kinetic Limitations and Disintegration: Selective Growth of Hexagonal Boron Nitride and Borophene Monolayers on Metal Substrates
ACS Nano 17, 17946 (2023)
DOI: 10.1021/acsnano.3c04038
2022
Fabian Thiemann, G. Sciaini, A. Kassen, Ulrich Hagemann, Frank Meyer zu Heringdorf and Michael Horn-von Hoegen
Ultrafast Transport-Mediated Homogenization of Photoexcited Electrons Governs the Softening of the A1g Phonon in Bismuth
Phys. Rev. B 106, 014315 (2022)
DOI: 10.1103/PhysRevB.106.014315
2021
Karim Omambac, Marin Petrović, Pantelis Bampoulis, Christian Brand, Marko A. Kriegel, Pascal Dreher, David Janoschka, Ulrich Hagemann, Nils Hartmann, Philipp Valerius, Thomas Michely, Frank Meyer zu Heringdorf and Michael Horn-von Hoegen
Segregation-Enhanced Epitaxy of Borophene on Ir(111) by Thermal Decomposition of Borazine
ACS Nano 15, 7421 (2021)
DOI: 10.1021/acsnano.1c00819
Karim Omambac, Marko Kriegel, Christian Brand, B. Finke, Laurenz Kremeyer, H. Hattab, David Janoschka, Pascal Dreher, Frank Meyer zu Heringdorf, Davood Momeni Pakdehi, Klaus Pierz, H.W. Schumacher, Marin Petrović, Arie van Houselt, B. Poelsema, M.C. Tringides and Michael Horn-von Hoegen
Non-Conventional Bell-Shaped Diffuse Scattering in Low-Energy Electron Diffraction from High-Quality Epitaxial 2D-Materials
Appl. Phys. Lett. 118, 241902 (2021)
DOI: 10.1063/5.0051220
Giriraj Jnawali, Davide Boschetto, Leandro M. Malard, Tony Heinz, Germán Sciaini, F. Thiemann, Thomas Payer, Laurenz Kremeyer, Frank Meyer zu Heringdorf and Michael Horn-von Hoegen
Hot Carrier Transport Limits the Displacive Excitation of Coherent Phonons in Bismuth
Appl. Phys. Lett. 119, 091601 (2021)
DOI: 10.1063/5.0056813
Anja Hanisch-Blicharski, Verena Tinnemann, Simone Wall, Fabian Thiemann, Thorben Groven, Jonas Darius Fortmann, Mohammad Tajik, Christian Brand, Bengt-Olaf Frost, Alexander von Hoegen and Michael Horn-von Hoegen
Violation of Boltzmann Equipartition Theorem in Angular Phonon Phase Space Slows down Nanoscale Heat Transfer in Ultrathin Heterofilms
Nano Lett. 21, 7145 (2021)
DOI: 10.1021/acs.nanolett.1c01665
Marin Petrović, Frank Meyer zu Heringdorf, Michael Horn-von Hoegen, Patricia A. Thiel and Michael C. Tringides
Broad Background in Electron Diffraction of 2D Materials as a Signature of Their Superior Quality
Nanotechnology 32, 505706 (2021)
DOI: 10.1088/1361-6528/ac244f
2020
Pablo Maldonado, T. Chase, A. H. Reid, X. Shen, R. K. Li, K. Carva, T. Payer, Michael Horn-von Hoegen, Klaus Sokolowski-Tinten, X. J. Wang, Peter M. Oppeneer and Hermann A. Dürr
Tracking the Ultrafast Nonequilibrium Energy Flow between Electronic and Lattice Degrees of Freedom in Crystalline Nickel
Phys. Rev. B 101, 100302(R) (2020)
DOI: 10.1103/PhysRevB.101.100302
S. Chen, Michael Horn-von Hoegen, Patricia A. Thiel, Adam Kaminski, Benjamin Schrunk, Athanassios Speliotis, E. H. Conrad and Michael C. Tringides
High Layer Uniformity of Two-Dimensional Materials Demonstrated Surprisingly from Broad Features in Surface Electron Diffraction
J. Phys. Chem. Lett. 11, 8937 (2020)
DOI: 10.1021/acs.jpclett.0c02113
2019
Bernd Hafke, Tobias Witte, Christian Brand, Thomas Duden and Michael Horn-von Hoegen
Pulsed Electron Gun for Electron Diffraction at Surfaces with Femtosecond Temporal Resolution and High Coherence Length
Rev. Sci. Instrum. 90, 045119 (2019)
DOI: 10.1063/1.5086124
Verena Tinnemann, Carla Streubühr, Bernd Hafke, Annika Kalus, Anja Hanisch-Blicharski, Manuel Ligges, Dietrich von der Linde, Uwe Bovensiepen and Michael Horn-von Hoegen
Ultrafast Electron Diffraction from a Bi(111) Surface: Impulsive Lattice Excitation and Debye Waller Analysis at Large Momentum Transfer
Struct. Dyn. 6, 035101 (2019)
DOI: 10.1063/1.5093637
Dennis Meyer, Giriraj Jnawali, Hichem Hattab and Michael Horn-von Hoegen
Rapid Onset of Strain Relief by Massive Generation of Misfit Dislocations in Bi(111)/Si(001) Heteroepitaxy
Appl. Phys. Lett. 114, 081601 (2019)
DOI: 10.1063/1.5088760
Karim Omambac, Hichem Hattab, Christian Brand, Giriraj Jnawali, Alpha T. N’Diaye, Johann Coraux, Raoul van Gastel, Bene Poelsema, Thomas Michely, Frank Meyer zu Heringdorf and Michael Horn-von Hoegen
Temperature-Controlled Rotational Epitaxy of Graphene
Nano Lett. 19, 4594 (2019)
DOI: 10.1021/acs.nanolett.9b01565
S. Chen, Michael Horn-von Hoegen, P. A. Thiel and M. C. Tringides
Diffraction Paradox: An Unusually Broad Diffraction Background Marks High Quality Graphene
Phys. Rev. B 100, 155307 (2019)
DOI: 10.1103/PhysRevB.100.155307
Verena Tinnemann, Carla Streubühr, Bernd Hafke, Tobias Witte, Annika Kalus, Anja Hanisch-Blicharski, Manuel Ligges, Ping Zhou, Dietrich von der Linde, Uwe Bovensiepen and Michael Horn-von Hoegen
Decelerated Lattice Excitation and Absence of Bulk Phonon Modes at Surfaces: Ultra-fast Electron Diffraction from Bi(111) Surface upon fs-Laser Excitation
Struct. Dyn. 6, 065101 (2019)
DOI: 10.1063/1.5128275
Arne Metzlaff and Andreas Wucher
Untersuchung der Wechselwirkung von Graphen unter keV-Argon-Ionen-Beschuss
6, (2019)
DOI: 10.17185/duepublico/81307
2018
Tim Frigge, Bernd Hafke, Tobias Witte, Boris Krenzer and Michael Horn-von Hoegen
Non-Equilibrium Lattice Dynamics of One-Dimensional In Chains on Si(111) upon Ultrafast Optical Excitation
Struct. Dyn. 5, 025101 (2018)
DOI: 10.1063/1.5016619
2017
Tobias Witte, Tim Frigge, Bernd Hafke, Boris Krenzer and Michael Horn-von Hoegen
Nanoscale Interfacial Heat Transport of Ultrathin Epitaxial Hetero Films: Few Monolayer Pb(111) on Si(111)
Appl. Phys. Lett. 110, 243103 (2017)
DOI: 10.1063/1.4986509