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PhD studentship on the optical properties on implanted monolayer transition metal dichalcogenides

Advertising institute: PGI-9 - Semiconductor Nanoelectronics
Reference number: D127/2017, Physics

Peter Grünberg Institute 9 (PGI-9), Forschungszentrum Jülich has an open PhD student position on the optical properties of implanted monolayer transition metal dichalcogenides.

Background
Monolayer transition metal dichalcogenides (TMDs) with the chemical formula MX2 (M=Mo,W, X=S, Se) have been shown to have unique optical properties. Their lattice symmetry, combined with the presence of heavy constituent atoms, leads to the coupling of spin- and valley- degrees of freedom, which can be addressed using circularly polarized light. The interaction of single photons with localized states in TMDs has been proposed as a method for accessing this spin-valley coupling. Here we intend to introduce single dopant atoms into TMDs, in order to bind excitons and to facilitate single photon emission. Ion implantation, which will be used in this project, is the most common way of introducing low densities of impurities in semiconductors. Ion implantation into monolayers requires the use of very low ion energies (<30 eV), in order to maximize implantation probability and minimize defect formation. The use of ion implantation at energies of 10-20 eV has recently been verified and will be developed further in this project, in order to introduce optically active dopants into TMDs in a controlled way. The results of this project will have far-reaching applications: in addition to the modification of the optical properties of monolayer TMDs, the implanted ions will be relevant for the realization of p- and/or n-doping.

Project description
.The selected candidate will characterize the optical signatures of dopants in MoS2 down to the single atom level and will integrate selected materials in single photon emitting sources. A variety of optical characterization techniques will be adapted for the purpose, including low temperature photoluminescence, photoluminescence excitation spectroscopies, correlation measurements etc. The project will involve the preparation of samples for implantation, as well as devices from the implanted monolayers using microelectronic fabrication techniques. The project will include collaboration with partners who will perform low energy implantation, transmission electron microscopy of the implanted samples and density functional theory calculations to support the experimental effort.

Job requirements
We welcome applications from candidates with a Master degree in physics and with a background and interest in optics and photonics. Candidates must have a strong aptitude in experimental physics and the drive and capacity to work independently.

Conditions of employment
We offer a full time appointment for three years and a gross monthly salary according to DPG guidelines. The successful candidate will be enrolled and graduate with a PhD from the Department of Physics in RWTH Aachen, Germany.

Forschungszentrum Jülich aims to employ more women in this area and therefore particularly welcomes applications from women. We also welcome applications from disabled persons.

Information and application
The deadline for application is 15th January 2018. Please contact Prof. Beata Kardynal (b.kardynal@fz-juelich.de) to apply or for more information. The application should contain the following documents:

  • Application letter.
  • Curriculum vitae including two names of potential referees.
  • Grade transcripts and BSc/MSc diploma (typically B.Sc. and M.Sc.).

Prof. Beata Kardynal
Peter Grünberg Institute
Forschungszentrum Jülich

E-Mail: b.kardynal@fz-juelich.de


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