PhD scholarship in Single-Photon Emitters in 2D Materials

DTU Fotonik
fredag 01 sep 17

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Frist 1. oktober 2017
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DTU Fotonik works with all areas of photonic engineering, including a strong focus on quantum optics and 2D materials. We are now seeking a PhD student to do exploratory research on the luminescence properties of 2D materials. The successful applicant will work at DTU Fotonik in the Structured Electromagnetic Materials group. Research will be carried out at DTU Fotonik, which is part of Centre of Excellence in Nanostructured Graphene (CNG) funded by the Danish National Research Foundation.

Responsibilities and tasks
Single-photon emitters such as quantum dots in III-V semi-conductors and colour centres in host dielectric materials (such as NV centres in diamond) have become in the last decade the main work horse to generate single photons for quantum applications such as quantum communication, and more recently for quantum sensing and quantum metrology. Despite their high single-photon emission properties that have enabled the recent blooming activities in quantum technology researches, these systems still suffer from limitations inherent to the bulky nature of the host materials. For example the high refractive indices of the III-V semiconductors limit the photon extraction efficiency and scatter light when located close to photonic crystal cavities or optical waveguides. Furthermore, the orientation of the dipole moment of the emitter is usually difficult to control, thus hindering the optimal coupling of single emitters with photonic cavities.

In the last two years pioneering experiments have demonstrated that atomic defects in atomic-thin 2D materials such as Transition Metal Dichalcogenides (TMD) and Boron Nitride (BN), also known as white graphene, can emit single photons with characteristics such as repetition rates, spectral bandwidth, and photon purity similar to their more bulky counterparts. The mono-atomic nature of these materials alleviates the limitations mentioned above, thus representing a new potential paradigm for single-photon sources.

In this project we propose to explore optical properties of luminescent defects in different 2D materials. We will investigate lifetime of the exciton, the spectra and the purity of the photons generated in these defects at low temperature with unique measurements setups available here at DTU Fotonik. The novelty of this research project is to investigate luminescent defects in new 2D materials that are synthetized only here, at DTU CNG. The PhD student will contribute to sample fabrication, characterization, optical experiments and their analysis, benefitting from the unique infrastructure and the experimental and theoretical expertise available at DTU Fotonik and DTU CNG.

The main goal of this project is to identify colour centres with optical performances matching their bulky competitors, emitting at wavelengths that are promising for on-chip integration. In the second stage of this PhD project, the PhD student will study the spontaneous-emission enhancement of these defects embedded inside plasmonic nanocavities and photonic crystals available here. This project could potentially lead to new integrated single-photon sources for nano-sensing and quantum imaging as well as in the new emerging field of quantum metrology.          

Qualifications
Candidates should have a master's degree in engineering/Physics or a similar degree with an academic level equivalent to the master's degree in Engineering/Physics. Priority will be given to students with experience in experimental nano-optics and quantum optics.

Approval and Enrolment
The scholarships for the PhD degree are subject to academic approval, and the candidates will be enrolled in one of the general degree programmes of DTU. For information about the general requirements for enrolment and the general planning of the scholarship studies, please see the DTU PhD Guide.   

Assessment
The assessment will be made by Assoc. Prof. Nicolas Stenger, Assoc. Prof. Sanshui Xiao, and Assoc. Prof. Martijn Wubs.

We offer
We offer an interesting and challenging job in an international environment focusing on education, research, scientific advice and innovation, which contribute to enhancing the economy and improving social welfare. We strive for academic excellence, collegial respect and freedom tempered by responsibility. The Technical University of Denmark (DTU) is a leading technical university in northern Europe and benchmarks with the best universities in the world.   

Salary and appointment terms
The salary and appointment terms are consistent with the current rules for PhD degree students. The period of employment is 3 years.

Further information
Further information may be obtained from Assoc. Prof. Nicolas Stenger, niste@fotonik.dtu.dk, Assoc. Prof. Sanshui Xiao, saxi@fotonik.dtu.dk, and Assoc. Prof. Martijn Wubs, mwubs@fotonik.dtu.dk.

You can read more about DTU Fotonik on www.fotonik.dtu.dk

Application
Please submit your online application no later than 1 October 2017. Applications must be submitted as one pdf file containing all materials to be given consideration. To apply, please open the link "Apply online," fill in the online application form, and attach all your materials in English in one pdf file. The file must include: 

  • A letter motivating the application (cover letter)
  • Curriculum vitae
  • Grade transcripts and BSc/MSc diploma
  • Excel sheet with translation of grades to the Danish grading system (see guidelines and excel spreadsheet here)

Candidates may apply prior to ob­tai­ning their MSc degree, but cannot begin before having received it.

All interested candidates irrespective of age, gender, race, disability, religion or ethnic background are encouraged to apply.

DTU Fotonik has 220 employees with a wide range of competences in optics and is one of the largest centers in the world based solely on research in photonics. Research are performed within optical sensors, lasers, LEDs, photovoltaics, ultra-high speed optical transmission systems, biophotonics, nonlinear optics, ultrafast optical science, nanophotonics and quantum photonics.

DTU is a technical university providing internationally leading research, education, innovation and scientific advice. Our staff of 5,800 advance science and technology to create innovative solutions that meet the demands of society; and our 10,600 students are being educated to address the technological challenges of the future. DTU is an independent academic university collaborating globally with business, industry, government, and public agencies.