PhD positions

There are currently PhD positions available.

Topics:
  • Single embedded magnetic atoms. Strong correlations and spinorbit interactions as basis for ultimately small quantum devices
  • Atomistic theory of impurities and correlations in two dimensional materials

For further details please contact Prof. T. Wehling (wehling - at - itp.uni-bremen.de).

We propose to create lateral heterojunctions in two-dimensional materials based on nonlocal manipulations of the Coulomb interaction using structured dielectric environments. By means of ab initio calculations for MoS2 as well as generic semiconductor models, we show that the Coulomb interaction-induced self-energy corrections in real space are sufficiently nonlocal to be manipulated externally, but still local enough to induce spatially sharp interfaces within a single homogeneous monolayer to form heterojunctions. We find a type-II heterojunction band scheme promoted by a laterally structured dielectric environment, which exhibits a sharp band gap crossover within less than 5 unit cells.