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Fachbereich Physik - Institut für Experimentalphysik

Research assistant (PhD student) (m/f/d) with 3/4-part-time job limited to 3 years Entgeltgruppe 13 TV-L FU Reference code: PhD-DFG-2021

Bewerbungsende: 12.04.2021

We are a research group in the Physics Department of Freie University specializing in nanoscale electronics and optoelectronics. Our main focus is two-dimensional atomic crystals – a class of materials that are only atoms thick. These include: graphene, atomically thick form of carbon with record electrical conductivity, thermal conductivity, and strength; monolayer transition metal dichalcogenides (MoS2, WSe2, MoSe2), semiconductors strongly interacting with light; and monolayer boron nitride (BN), an atomically-smooth insulator material. Our overarching goal is to answer the following questions: How does one controllably create, pattern, and manipulate two-dimensional atomic crystals? What happens to interacting electrons that are confined in two dimensions and are governed by the laws of quantum mechanics? Can we use nanoelectromechanical devices based on graphene to sense ultrasmall forces and weigh ultralight objects? Our main experimental tools include nanofabrication, transport measurements, static and time-resolved optoelectronic measurements.

Job description:
You will participate in the DFG-sponsored project "Graphene-based nanomechanical detectors of terahertz radiation". The goal of the project is to develop novel graphene-based platform for terahertz (THz) radiation detection. We explore an innovative approach to THz bolometry where a temperature change caused by THz absorption is detected by measuring the effect it has on the mechanical resonance frequency of suspended graphene nanoelectromechanical (NEMS) device. The advantages of these devices include high sensitivity, frequency-tunability and easy multiplexing of detector signals allowing for designing detector matrices. The project is based on the synergy between the experts in graphene THz photodetection (the Moscow-based Fedorov group) and the experts in graphene nanomechanics and electrical transport (the Berlin-based Bolotin group). The third-party funded research project provides an opportunity to do a doctorate.

Master's degree in natural sciences.

Experience with fabrication and properties of two-dimensional materials, nanofabrication techniques (electron-beam lithography, microscopies, thin-film processing), optical spectroscopies. Programming experience. Experience in Thz spectroscopy, optics, or electronics is a plus.

Stellenauschreibung vom: 21.03.2021