Non-equilibrium carrier dynamics in proximity-coupled graphene (E4)
Project description
The interface between epitaxial graphene (EG) and SiC(0001) is a confined space that allows for the growth of novel two-dimensional materials (2DMs) with intriguing electronic properties including Mott insulators, Rashba materials, superconductors, and possibly topological insulators. While these 2DMs are interesting in their own right, they also offer an intriguing platform to investigate various proximity-induced effects on the graphene layer that rests on top of them. The main objective of the present project is to investigate the influence of the intercalated 2DM on the non-equilibrium carrier dynamics (NECD) of the graphene layer with time- and angle-resolved photoemission spectroscopy (tr-ARPES). In a first step we will use confinement epitaxy to stabilize honeycomb layers made of Bi, Sb, or Sn with topologically non-trivial electronic properties at the interface between EG and SiC(0001). Next, we will set out to unravel the influence of various defects on the NECD in EG. Finally, we will investigate the influence of proximity-induced spin-orbit coupling, non-trivial topology, correlations, and superconductivity on the NECD in EG.
Composition of the project group
- Isabella Gierz-Pehla, project leader
- Maria-Elisabeth Federl
- Franziska Bergmeier
- Johannes Gradl
- Leonard Weigl
Project-related publications
k-resolved ultrafast light-induced band renormalization in monolayer WS2 on graphene
N. Hofmann, A. Steinhoff, R. Krause, N. Mishra, G. Orlandini, S. Forti, C. Coletti, T.O. Wehling, I. Gierz, arXiv , (2024)
Non-equilibrium carrier dynamics and band structure of graphene on 2D tin
M.-E. Federl, N. Witt, B. Yang, N. Hofmann, J. Gradl, L. Weigl, I. Piquero-Zulaica, J.V. Barth, N. Mishra, C. Coletti, T.O. Wehling, I. Gierz, arXiv , (2024)
Direct evidence for efficient ultrafast charge separation in epitaxial WS2/graphene heterostructures
S. Aeschlimann, A. Rossi, M. Chávez-Cervantes, R. Krause, B. Arnoldi, B. Stadtm¨ uller, M. Aeschlimann, S. Forti, F. Fabbri, C. Coletti, I. Gierz, Sci. Adv. 6, eaay0761 (2020)
Charge Density Wave Melting in One-Dimensional Wires with Femtosecond Subgap Excitation
M. Chávez-Cervantes, G. E. Topp, S. Aeschlimann, R. Krause, S. A. Sato, M. A. Sentef, I. Gierz, Phys. Rev. Lett. 123, 036405 (2019)
Band structure dynamics in indium wires
M. Chávez-Cervantes, R. Krause, S. Aeschlimann, I. Gierz, Phys. Rev. B 97, 201401 (2018)
Enhanced electron-phonon coupling in graphene with periodically distorted lattice
E. Pomarico, M. Mitrano, H. Bromberger, M. A. Sentef, A. Al-Temimy, C. Coletti, A. Stöhr, S. Link, U. Starke, C. Cacho, R. Chapman, E. Springate, A. Cavalleri, I. Gierz, Phys. Rev. B 95, 024304 (2017)
Ultrafast momentum imaging of pseudospin-flip excitations in graphene
S. Aeschlimann, R. Krause, M. Chávez-Cervantes, H. Bromberger, R. Jago, E. Malic, A. Al-Temimy, C. Coletti, A. Cavalleri, I. Gierz, Phys. Rev. B 96, 020301 (2017)
Tracking Primary Thermalization Events in Graphene with Photoemission at Extreme Time Scales
I. Gierz, F. Calegari, S. Aeschlimann, M. Chávez Cervantes, C. Cacho, R.T. Chapman, E. Springate, S. Link, U. Starke, C. R. Ast, A. Cavalleri, Phys. Rev. Lett. 115, 086803 (2015)
Phonon-Pump Extreme-Ultraviolet-Photoemission Probe in Graphene: Anomalous Heating of Dirac Carriers by Lattice Deformation
I. Gierz, M. Mitrano, H. Bromberger, C. Cacho, R. Chapman, E. Springate, S. Link, U. Starke, B. Sachs, M. Eckstein, T. O. Wehling, M. Katsnelson, A. Lichtenstein, A. Cavalleri, Phys. Rev. Lett. 114, 125503 (2015)
Snapshots of non-equilibrium Dirac carrier distributions in graphene
I. Gierz, J. C. Petersen, M. Mitrano, C. Cacho, I. C. E. Turcu, E. Springate, A. Stohr, A. Köhler, U. Starke, A. Cavalleri, Nat. Mater. 12, 1119 (2013)
Electronic decoupling of an epitaxial graphene monolayer by gold intercalation
I. Gierz, T. Suzuki, R. T. Weitz, D. S. Lee, B. Krauss, C. Riedl, U. Starke, H. Höchst, J. H. Smet, C.R. Ast, K. Kern, Phys. Rev. B 81, 235408 (2010)
Atomic Hole Doping of Graphene
I. Gierz, C. Riedl, U. Starke, C. R. Ast, K. Kern, Nano Lett. 8, 4603 (2008)
Isabella Gierz-Pehla
U Regensburg
+49 941 943-2142
isabella.gierz@ur.de
https://www.uni-regensburg.de/physics/gierz/people/index.html
