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Scientific Assistant (PhD student) (f/m/d)
Institute of Solid-State Physics

Fachbereich 1 - Physik / Elektrotechnik

Entgelt- / Besoldungsgruppe E 13 - Teilzeit 75%
Kennziffer: A67/23
Bewerbungsfrist: 17.04.2023
Öffentliche Ausschreibung

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The Institute of Solid-State Physics at the University of Bremen offers at the earliest possible date a position as

Scientific Assistant (PhD student) (f/m/d)
German pay scale E13 TV-L (75%), limited for 3 years

for the research project
“Thermal transport in photonic semiconductor membranes”.

The time limitation is subject to the scientific qualification according to the Act of Academic Fixed-Term Contract, §2 (1) (WissZeitVG - Wissenschaftszeitvertragsgesetz). Therefore, candidates may only be considered if they dispose of the respective scope of qualification periods according to §2 (1) WissZeitVG.


During the last decades, substantial research was devoted to the optical properties of semiconductor nanostructures, which subsequently enabled various applications like nano-lasers and micro-light-emitting-diodes. However, the high level of sophistication for such research is often contrasted by scarce knowledge about the related thermal phenomena, limiting the device efficiency and longevity - both important aspects of sustainability. Hence, this project aims to bridge the fields of nanoscale thermometry and photonics by applying, so-called, hybrid spectroscopy to semiconductor membranes, which can subsequently be optimized from a photonic and thermal point of view, serving next device generations.

The “Semiconductor Optics” group at the Institute of Solid-State Physics ( currently features two fully customized spectroscopy setups that enable the joined optical and thermal characterization of semiconductor nanostructures. Therefore, (time-resolved) micro-Photoluminescence (µPL) spectroscopy is, e.g., combined with 1-Laser and 2-Laser Raman spectroscopy forming the basis for new types of hybridized spectroscopy, aiming to simultaneously access the optical and thermal material properties on the micro- and nano-scale. Material growth (e.g., group-III nitrides and oxides), related processing, and in-detail material characterization is commonly undertaken in close collaboration with our research partners at the Institute of Solid-State Physics, which is further supported by a range of international cooperation partners.

To support our research activities, we are looking for a dedicated PhD student, who will not only further develop our present spectroscopy, but will also process required nanostructures by means of focused ion beam and/or electron-beam lithography. As a result, highly spatially resolved temperature maps will be acquired and subsequently linked to µPL measurements. Here, especially the role of interfaces and boundaries shall be studied in a wide temperature range. Clearly, this will also require advanced modelling efforts, which will also be supported by our national and international partners. In addition, teaching to the extent of three semester hours (maximum) is required, which will best be linked to the present research field.

The Institute for Solid State Physics seeks to offer an ideal research environment, direct involvement in international research activities, complemented by attractive research facilities. As a result, it is our aim to enable most fruitful and also rewarding PhD studies.


  • A scientific university degree (Diplom/Master/MSc) in physics or electrical engineering, etc., with an average grade better than 2.0 (German system) or B (English system).
  • Very good knowledge and relevant experience in at least one of the following fields: Photoluminescence spectroscopy, Raman spectroscopy, thermal transport measurements, thermal transport simulations, characterization of phononic or photonic crystals, modelling of phononic or photonic crystals, electron beam lithography, focussed ion beam lithography.
  • Good programming skills in, e.g., Labview, Matlab, Python / experience with Comsol or similar software packages
  • Strong interest in bridging fields of thermal transport and optical characterization. This especially means that after an introductory phase, also own ideas can be developed and finally be implemented in the laboratory. Thus, a creative mindset is needed that strives to go beyond the aforementioned topics and methods. All these just describe some promising first possibilities, but can always be augmented by own ideas forming the basis for future scientific independence (educational aim).
  • Good communication and presentation skills, due to cooperation with international partners.
  • Very good knowledge of the English language in spoken and written form.

Allgemeine Hinweise

The university is family-friendly, diverse and sees itself as an international university. We therefore welcome all applicants regardless of gender, nationality, ethnic and social origin, religion/belief, disability, age, sexual orientation and identity.

As the University of Bremen intends to increase the proportion of female employees in science, women are particularly encouraged to apply.

Please explicitly address the specified requirements in the application. Please send your application documents in English or German (cover letter, CV, and copy of your degree certificates including high school) until April 17th, 2023 by indicating the job ID A67/23 to:

Universität Bremen, FB1
Institut für Festkörperphysik
Prof. Dr. Gordon Callsen
Geb. NW 1, Raum W4120
Otto-Hahn-Allee 1
28359 Bremen, Germany
Phone: +49-421-218-62201

or in electronic form in one PDF file via e-mail to: a67-23protect me ?!fb1.uni-bremenprotect me ?!.de

For scientific questions regarding the research project please contact: gcallsenprotect me ?!uni-bremenprotect me ?!.de