News from the group of theoretical physics

In contrast to silicon-based transistors, single-molecule junctions can be gated by simple mechanical means: by either stretching or pulling the electrodes. The detailed impact of gating on the conductance has to be evaluated by using quantum theory. Our team has paired with an experimental lab to understand what is going on when you stretch a single molecule.

Scientists from our faculty have made a groundbreaking discovery in the field of optoelectronics. Our research demonstrates a new way to manipulate excitons in semiconductors using coherent optical interactions, opening the door for ultrafast valleytronics operating at multiterahertz frequencies.

An electron and a hole can create bound states known as excitons. When these states occur in an atomically thin semiconducter layer, they behave like two-dimensional hydrogen atoms. Well, not exactly. Find more details in our recent paper.

Materials called transition metal dichalcogenides can hold electrons in band minimas called valleys. We have investigated the possibility to control these electronic states by light pulses. Find the thorough theoretical analysis in our recent paper!

The luminescence spectrum of excitons in ReS2 resembles the transitions in a free atom (Rydberg series), except that some transitions are missing, they are “dark”. This is due to interactions, as detailed by the theoretical calculations of A. Slobodenyuk, and verified by measurements in magnetic fields. Find more details in our recent paper.

We welcome Dr. Athanasios Koliogiorgos and wish him a successful post-doctoctoral stay

The luminescence spectrum of excitons in ReS2 resembles the transitions in a free atom (Rydberg series), except that some transitions are missing, they are “dark”.