Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 86: Surface dynamics
O 86.7: Vortrag
Donnerstag, 12. März 2026, 16:45–17:00, HSZ/0403
Spatiotemporal control of Peierls heterostructures by valley-selective photoswitching — •Hannes Böckmann1, Jan Gerrit Horstmann3, Felix Kurtz1, Manuel Buriks4, Karun Gadge4, Salvatore Manmana4, Stefan Wippermann5, and Claus Ropers1,2 — 1Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany — 24th Physical Institute, Solids and Nanostructures, University of Göttingen, Germany — 3Department of Materials, ETH Zurich, Zürich, Switzerland — 4Institute for Theoretical Physics, University of Göttingen, Germany — 5Faculty of Physics, Philipps University of Marburg, Germany
Phase competition and coexistence are hallmarks of strongly-correlated materials, promising tunable functionality on the nanoscale. Light allows for tilting the balance between distinct correlated states and phases with a prominent example given by the optical switching of an insulator to a metal. However, optical excitation generally lacks the specificity to select sub-wavelength domains. In this work, we employ valley-selective photodoping of correlated electronic states to drive the domain-specific quench of a textured Peierls insulator. Specifically, we exploit the anisotropic absorption of nanowire domains by tuning both the photon energy and the polarization to the transition matrix elements most strongly coupled to the structural transformation. We find that averting dissipation facilitates domain-specific carrier confinement, control over nanotextured phases, and a prolonged lifetime of the metastable metallic state.
Keywords: Photoinduced phase transitions; Charge density waves; Surface structure dynamics; Ultrafast electron diffraction