Prof. Ph.D. Jonathan Finley
- +49 89 289-12770
Visitenkarte in TUMonline
- Halbleiter-Nanostrukturen und -Quantensysteme
- Professur für Halbleiter-Nanostrukturen und -Quantensysteme
- Leading the Nanostructure Spectroscopy Group at Walter Schottky Institut of TUM: focus on understanding, manipulating and exploiting electronic, spin and photonic quantum phenomena in semiconductors and nanostructured electronic and photonic materials. Major research interests include: optical, electronic and spintronic properties of semiconductor quantum dots and wires fabricated from Aimonides, group-IV materials (Si, SiGe, C) and II-VI semiconductors and oxides (CdSe, ZnO). Another major arm of our research concerns quantum optical studies of dielectric and metallic nano-photonic materials and the application of such systems for applications in quantum information processing, metrology and sensing.
- Freitag 9:00 bis 11:00
Lehrveranstaltungen und Termine
Ausgeschriebene Angebote für Abschlussarbeiten
- Exploring Exciton-Exciton Interactions in Atomically Thin Nanomaterials
Monolayer transition metal dichalcogenides (TMD) are “graphene-like” layered materials consisting of covalently bonded trilayers of atoms held together by weak van der Waals bonds . Unlike graphene that has vanishing bandgap, monolayer TMDs are direct gap semiconductors with bandgaps >2eV. The weak dielectric screening results in them hosting very strongly bound 2D Wannier-Mott like excitons with binding energies >>kBT at room temperature and radii in the range of a couple of nm. The excitonic photo-physics of such nanomaterials currently attracts a lot of attention with many key questions like: How do excitons in atomically thin materials interact with their environment? and What is the role of exciton-exciton interactions on the coherence and optical efficiency of such materials?
This thesis is aimed at particularly capable students who are interested to join us to explore the fascinating photophysics of TMD heterostructures. In the first part of the thesis you will build-up, test and control an optical fiber based tunable Fabry-Perot cavity formed between an ultralow-roughness mirror fabricated directly on the end facet of an optical fiber  and a high-reflectivity Distributed Bragg Reflector onto which the TMD-heterostructure is placed. The separation between the fiber end facet and the lower DBR mirror will be piezo- stabilized to achieve ultra-high cavity finesse and tuned to controllably vary the frequency of the cavity mode and tune it through the exciton transition of the TMD. Hereby, the coherent interaction between the cavity field and the exciton will be revealed by the observation of cavity polaritons . Once developed at room temperature, the systems will aim to make measurements with the entire microscope at liquid helium temperatures where the light-matter interactions are much more coherent....
(1) Be highly motivated, (2) Be practically minded, (3) Enjoy working with state of the art optics and with control electronics / computer control and be capable of programming (e.g. Labview, C++ , Python) (4) Be willing to work as part of a small team in a dark lab in the summertime....
(1) experience of performing sophisticated optical spectroscopy in state-of-the-art laboratories and (2) a sound understand / explore exciton-exciton interactions in TMD-nanomaterials and, hopefully, (3) a nice paper in a journal.
 D Hunger et al, New J. Phys. 12 065038, (2010)
 S. Dufferwiel et al. Nature Communications 6, 8579 (October 2015)
INTERESTED? The please E-Mail firstname.lastname@example.org or come by my office for a discussion,.
- geeignet als
- Bachelorarbeit Physik
- Masterarbeit Physik der kondensierten Materie
- Themensteller(in): Jonathan Finley