Nanotechnology and Nanomaterials
Prof. Alexander Holleitner
Research Field
The Holleitner group investigates optoelectronic phenomena in nanoscale circuits with special focus on ultrafast optoelectronics, quantum optoelectronics, and excitonic systems. Exploiting an on-chip THz time-domain photocurrent spectroscopy, picosecond currents in na-noscale circuits are explored in the time domain including dielectric displacement currents, the non-equilibrium transport of photogenerated charge and spin carriers, helicity dependent currents, time-resolved photo-thermoelectric phenomena, and recombination lifetime limited photocurrents. A further topic is the study of many-body phenomena and interactions in dipolar excitonic ensembles in nanofabricated quantum traps formed in semiconductor heterostructures. In addition, novel types of photo-electronic systems are constructed and investigated that consist of mixed organic and inorganic nanosystems such as molecules, nanocrystals, 2D layered materials, carbon nanotubes, and photosynthetic "light harvesting" proteins. The research topics aim to fully exploit the potential of nanoscale circuits for optoelectronic and photovoltaic applications, as well as for communication and information technologies.
Members of the Research Group
Professor
| Photo | Degree | Firstname | Lastname | Room | Phone | |
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Prof. Dr. | Alexander | Holleitner | 1.005 | +49 89 289-11575 |
Office
| Photo | Degree | Firstname | Lastname | Room | Phone | |
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Emel | Özdemir | – | +49 89 289-11441 |
Scientists
| Photo | Degree | Firstname | Lastname | Room | Phone | |
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M.Sc. | Katja | Barthelmi | 1.017 | +49 89 289-11411 | |
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M.Sc. | Johannes | Gröbmeyer | – | – | |
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M.A. | Elisabeth | Heiß | – | – | |
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M.Sc. | Alexander | Hötger | 1.017 | +49 89 289-11538 | |
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Dr. | Christoph | Kastl | 1.004 | +49 89 289-11455 | |
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M.Sc. | Jonas | Kiemle | 1.002 | +49 89 289-11550 | |
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Dipl.-Kfm. | Bernhard | Kraus | 2926.01.104 | +49 172-4587978 | |
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M.Sc. | Maanwinder Partap Singh | 1.017 | +49 89 289-11531 | ||
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Ana | Micevic | – | – | ||
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M.Sc. | Katharina | Nisi | 1.002 | +49 89 289-11304 | |
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M.Sc. | Florian | Sigger | 1.002 | +49 89 289-11412 | |
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M.Sc. | Mirco | Troue | 1.018 | – | |
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Prof. Dr. | Jan | von Delft | – | – |
Other Staff
| Photo | Degree | Firstname | Lastname | Room | Phone | |
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Dr. | Anna | Donhauser | – | – | |
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Dr. | Judith | Gabel | – | – | |
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Dr. | Stefan | Küchemann | – | – | |
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Prof. Dr. | Jochen | Kuhn | – | – | |
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Björn | Ladewig | – | – | ||
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Claudia | Paulus | – | +49 89 289-11573 | ||
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Dimitris | Saraidaris | – | – | ||
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Prof. Dr. | Olcay | Üzengi Aktürk | – | – |
Teaching
Course with Participations of Group Members
Offers for Theses in the Group
- Atomistically thin semiconducting 2D materials and their optical properties
- Atomically thin van der Waals crystals form truly two-dimensional materials with remarkable quantum effects. Examples range from semi-metallic graphene to topological insulators and semiconducting materials with a thickness of only few atoms. The goal of this project is to characterize the fundamental symmetries of the underlying crystals and optical properties of such two-dimensional materials determined by optical means including Raman, photoluminescence (PL) and second harmonic generation (SHG) measurements, and to understand their optical properties particularly in two-dimensional heterostacks. The latter allow to build atomically thin field-effect, tunnelling, and photovoltaic devices. Interest and good knowledge in solid state physics, semiconductor physics, Python programming, optoelectronics or nanofabrication is a plus, but certainly not a must.
- suitable as
- Master’s Thesis Applied and Engineering Physics
- Supervisor: Alexander Holleitner
- Determination of optical dipole of quantum emitters
In this project, the emitter dipole of single quantum emitters in two-dimensional materials shall be explored by applying a back-focal-plane imaging method. The back-focal-plane image in a microscope allows to determine whether the photon emitters exhibit an in-plane or out-of-plane dipole at the focal spot of the microscope. Moreover, the circular dichroism of the emission shall be explored to learn about he spin- and valley-selection rules of the underlying emitters. Both insights are essential for the interpretation of the wave-functions of the quantum emitters, and to what extend, the emitters can be modelled in terms of a two-level-system.
Interest or good knowledge in solid state physics, semiconductor physics, Python programming, optoelectronics or nanofabrication is a plus, but certainly not a must.
- suitable as
- Master’s Thesis Quantum Science & Technology
- Supervisor: Alexander Holleitner
- Non-linear anomalous thermal transport in 2D materials with broken symmetry
- In atomistic crystals with a broken inversion symmetry, a thermal gradient is supposed to generate a non-equilibrium spin-population at the edges of the material. So far, similar non-linear effects with an anomalous spin-population have been detected mainly by electronic means. This project explores the important impact of the thermal (phonon) bath on the spin-dynamics in corresponding crystals. Interest or good knowledge in solid state physics, semiconductor physics, Python programming, optoelectronics or nanofabrication is a plus, but certainly not a must.
- suitable as
- Bachelor’s Thesis Physics
- Supervisor: Alexander Holleitner
Current and Finished Theses in the Group
- Optoelectronic Measurements of Edge States in 3D Quantum Hall Materials
- Abschlussarbeit im Masterstudiengang Physics (Applied and Engineering Physics)
- Themensteller(in): Alexander Holleitner