About

Professor in Physics at the Department of Physics, Göteborg University (GU).

My research field is Theoretical Surface Science and Strongly Correlated materials. The level of activity increases up the list below (updated October 2020):

• Electron-phonon coupling in graphene and other low dimensional materials.
• Plasmonics: Plasmarons and acoustic surface plasmons.
• Self-consistent Gutzwiller variational scheme for multi-band models with full interaction.
• Dynamical mean field theory (DMFT) applying the method of exact diagonalisation (ED)
• First principles studies of surface phonons - clean metal surfaces and alkali covered surfaces. Renormalization of surface localized phonon energies due to excitations of electron-hole pairs (electron-phonon coupling).
• Dynamics of surface localized electron states ; electron-phonon coupling and lifetimes.
• Nano-Catalysis - Density functional theory studies of electron structure and reactivity of Quantum Dots. Dot size- and composition dependence of molecular reactivity.
• First principles studies of alkali metal overlayer structures on metals. Phonon induced lifetimes of Quantum Well hole states.
• First principles studies of Grain Boundary physics; mechanism of the non-linear I/V characteristics of ZnO Varistors.
• Surface Photochemistry. Photo-induced desorption.

• Electron-phonon coupling (EPC) in graphen and other low dimensonal materials (2020: active) - Study of intraband and interband scattering driven by EPC applying Tight binding and Constant force models combined with $first$ $principles$ DFT calculations and ARPES measurements. Collaborators: T. Frederiksen DIPC San Sebastian, J. Wells NTNU Trondheim, Balasubramanian Thiagarajan MAXIV Lund
• Plasmaron excitations in 2D systems (2020: sleeping) - DFT based study of plasmaron excitations in overlayer systems. Collaborators: V.M. Silkin DIPC San Sebastian, Balasubramanian Thiagarajan MAXIV Lund
• Strongly correlated materials (2020: rests in peace) - Self-consistent LDA+Gutzwiller scheme for multiband systems taking into account full local interaction. Collaborator: H. Strand, University of Fribourg and Xi Dai, Insttute of physics, CAS, Beijing)

• hellsing@physics.gu.se
• +46 31 786 91 76
• Department of Physics, University of Gothenburg, Origovägen 6B, 412 96 Göteborg, Sweden