Project B3: THz and Time-Resolved Optical Spectroscopy of Buried Interfaces
Principle Investigator: Prof. Dr. Martin Koch, Prof. Dr. Wolfram Heimbrodt (Marburg, Dept. of Physics)
Summary
The main focus of this project is the experimental
study of the carrier dynamics at buried interfaces in semiconductor
systems. We will employ optical pump-white-light probe, optical
pump-Thz probe spectroscopy and time-resolved luminescence to study the
initial charge transfer through the interface as well as the formation
and decay dynamics of charge-transfer excitons. As a new aspect we will
also investigate the coherent dynamics of charge-transfer excitons
performing four-wave-mixing experiments on spatially indirect
transitions. In the second phase of the collaborative research center
we will intensify our investigations to reveal correlations between the
structural quality of the interface and the carrier dynamics on the
different time-scales. In addition, we will continue to study how
strong transient THz fields modify the initial carrier dynamics at
buried interfaces.
The samples will be grown in project A1 (Stolz) and will be
structurally characterized in project A5 (Volz). The analysis of the
experimental data will be performed in close cooperation with B4 (SW
Koch).
Project-Related Publications
- L. Rost, S. Gies, M. Stein, C. Fuchs, S. Nau, P. Kükelhan, K. Volz,
W. Stolz, M. Koch, W. Heimbrodt
Correlation of optical properties and interface morphology in type-II semiconductor heterostructures
J. Phys. Condens. Matter 31, 014001 (2019). - M. Stein, C. Lammers, P.-H. Richter, C. Fuchs, W. Stolz, M. Koch,
O. Vänskä, M.J. Weseloh, M. Kira, S.W. Koch
Dynamics of charge-transfer excitons in type-II semiconductor heterostructures
Phys. Rev. B 97, 125306 (2018). - M. Stein, C. Lammers, M.J. Drexler, C. Fuchs, W. Stolz, M.
Koch
Enhanced absorption by linewidth narrowing in optically excited type-II semiconductor heterostructures
Phys. Rev. Lett. 121, 017401 (2018). - W.-R. Hannes, A. Trautmann, M. Stein, F. Schäfer, M. Koch, T.
Meier
Strongly nonresonant four-wave mixing in semiconductors
Phys. Rev. B 101, 075203 (2020). - I. Meyenburg, N. Hofeditz, R. Ruess, M. Rudolph, D. Schlettwein, W.
Heimbrodt
Optical determination of charge transfer times from indoline dyes to ZnO in solid state dye-sensitized solar cells
AIP Adv. 8, 055218 (2018). - L.M. Schneider, S. Lippert, J. Kuhnert, O. Ajayi, D. Renaud, S.
Firoozabadi, Q. Ngo, R. Guo, Y.D. Kim, W. Heimbrodt, J.C. Hone, A.
Rahimi-Iman
The influence of the environment on monolayer tungsten diselenide photoluminescence
Nano-Struct. Nano-Objects 15, 84 (2018).