Project

Computational design of single-photon emitters for quantum technology

Publisher

Supervisor

Location

Greater Copenhagen area

Single-photon emitters are a prerequisite for many quantum technologies including quantum communication and encryption. Until now, single photon emitters have mainly consisted of quantum dots, single molecules, or localised defects in bulk structures. All of these approaches have problems, either in integrating the single photon source in a device, or in the harvesting of the photons after production.

Recently, single-photon emission has been observed from defects in single-layer hexagonal boron- nitride (hBN), a wide-bandgap semiconductor. The defects introduce localized states inside the band gap, and photons are generated by the electronic transitions between the localized states. As the system is quasi two-dimensional, a probe can be placed arbitrarily close to the single photon source, ensuring efficient harvesting, and since boron nitride is a bulk structure, integration into devices is easier.

Through ion implantation techniques, it is possible to introduce many different species of atom into the pristine boron nitride lattice, as either substitutional or interstitial vacancies, without disturbing the global lattice structure. This project aims to simulate the behaviour of these point defects with the aim of identifying specific structures with promising properties for single photon emission. 

The student will perform quantum mechanical computer simulations in the framework of density functional theory (DFT) to obtain the atomic structure and electronic energy levels of different point defects and impurity atoms in a single layer of hBN. Calculations will be performed using our in-house developed DFT code GPAW.  From these calculations the characteristics of the photon emission spectrum will be derived and the most promising systems will be identified. 

The project is well connected to ongoing research activities both within CAMD and at the Center for Nanostructured Graphene (CNG); you will thus be part of a larger team of researchers working on 2D materials and electronic structure theory. The data produced and results obtained in the course of the project will also be beneficial for the 2D Materials Database developed and maintained at CAMD.     


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Contact

Company / Organization

DTU Fysik

Name

Kristian Sommer Thygesen

Position

Professor

Mail

thygesen@fysik.dtu.dk

Supervisor info

BSc in Electrical Engineering

Supervisor

Kristian Sommer Thygesen

ECTS credits

5 - 30

Type

Final project, BSc project, MSc thesis, Special course

BSc in Physics and Nanotechnology

Supervisor

Kristian Sommer Thygesen

ECTS credits

5 - 30

Type

Final project, BSc project, MSc thesis, Special course

Msc in Earth and Space Physics and Engineering

Supervisor

Kristian Sommer Thygesen

ECTS credits

5 - 30

Type

Final project, BSc project, MSc thesis, Special course

MSc in Electrical Engineering

Supervisor

Kristian Sommer Thygesen

ECTS credits

5 - 30

Type

Final project, BSc project, MSc thesis, Special course

MSc in Engineering, Photonics Engineering

Supervisor

Kristian Sommer Thygesen

ECTS credits

5 - 30

Type

Final project, BSc project, MSc thesis, Special course

MSc in Mathematical Modelling and Computation

Supervisor

Kristian Sommer Thygesen

ECTS credits

5 - 30

Type

Final project, BSc project, MSc thesis, Special course

MSc in Physics and Nanotechnology

Supervisor

Kristian Sommer Thygesen

ECTS credits

5 - 30

Type

Final project, BSc project, MSc thesis, Special course

Technical University of Denmark

For almost two centuries DTU, Technical University of Denmark, has been dedicated to fulfilling the vision of H.C. Ørsted – the father of electromagnetism – who founded the university in 1829 to develop and create value using the natural sciences and the technical sciences to benefit society.


Today, DTU is ranked as one of the foremost technical universities in Europe, continues to set new records in the number of publications, and persistently increases and develops our partnerships with industry, and assignments accomplished by DTU’s public sector consultancy.

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Anker Engelunds Vej 1
Bygning 101A
2800 Kgs. Lyngby

Denmark



Tlf. (+45) 45 25 25 25

CVR-nr. 30 06 09 46

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