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Scientific Projects

ICRC TRR 160 projects

Coherent Control of the Electronic and Nuclear Spins in Quantum Dot Ensembles

Project A4 of ICRC TRR 160

with

The proj­ect is focused on the quantitative theoretical description of coherent control and dynamic spin polarization in ensembles of quantum dots induced by ultrafast pumping by optical laser pulses. We describe the radiative decay of the intermediate trion states simultaneously considering the hyperfine coupling to baths of various nuclear spins due to the presence of different isotopes, the dipole-dipole interaction among the nuclear spins, and the nuclear quadrupolar interaction induced by strain fields. Quantum mechanical and semi-classical techniques combined with stochastic approaches will be employed to assess the effect of trains of pulses and to suggest protocols for spin manipulation. Novel foci are interactions between the spins of different quantum dots and spin inertia as measured by the laser pulses with modulated circular polarization. We will study both conventional quantum dots from III-V semiconductors as well as novel types of nanosystems such as organic/inorganic perovskites.

Theory of Spin Noise in Semiconductor Quantum Dots

Project A7 of ICRC TRR 160

with

The proj­ect is focused on the quantitative theoretical description of coherent control and dynamic spin polarization in ensembles of quantum dots induced by ultrafast pumping by optical laser pulses. We describe the radiative decay of the intermediate trion states simultaneously considering the hyperfine coupling to baths of various nuclear spins due to the presence of different isotopes, the dipole-dipole interaction among the nuclear spins, and the nuclear quadrupolar interaction induced by strain fields. Quantum mechanical and semi-classical techniques combined with stochastic approaches will be employed to assess the effect of trains of pulses and to suggest protocols for spin manipulation. Novel foci are interactions between the spins of different quantum dots and spin inertia as measured by the laser pulses with modulated circular polarization. We will study both conventional quantum dots from III-V semiconductors as well as novel types of nanosystems such as organic/inorganic perovskites.

fs-Manipulation of Charge-Magnetism Coupling in an Antiferromagnetic Semiconductor

Project B8 of ICRC TRR 160

with

The main goal of proj­ect B8 is to realize femtosecond spin-to-charge and charge-to-spin conversion in an AF semiconductor.The intrinsic physical complexity of our proj­ect demands both a thorough investigation of the ground state of our sample material and a tight collaboration between experiments and theory. Experimentally, we will implement a procedure allowing to disclose the real-time evolution of both the spin and charge systems. Theoretically, state-of-the-art modelling is needed to achieve a comprehensive understanding of the equilibrium and non-equilibrium re­le­vant properties, since they are both generated by many body ef­fects, electronic correlations and spin-charge coupling which are all notoriously arduous to handle.

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Location & approach

The campus of TU Dort­mund University is located close to interstate junction Dort­mund West, where the Sauerlandlinie A 45 (Frankfurt-Dort­mund) crosses the Ruhrschnellweg B 1 / A 40. The best interstate exit to take from A 45 is “Dort­mund-Eichlinghofen” (closer to South Campus), and from B 1 / A 40 “Dort­mund-Dorstfeld” (closer to North Campus). Signs for the uni­ver­si­ty are located at both exits. Also, there is a new exit before you pass over the B 1-bridge leading into Dort­mund.

To get from North Campus to South Campus by car, there is the connection via Vogelpothsweg/Baroper Straße. We recommend you leave your car on one of the parking lots at North Campus and use the H-Bahn (suspended monorail system), which conveniently connects the two campuses.

TU Dort­mund University has its own train station (“Dort­mund Uni­ver­si­tät”). From there, suburban trains (S-Bahn) leave for Dort­mund main station (“Dort­mund Hauptbahnhof”) and Düsseldorf main station via the “Düsseldorf Airport Train Station” (take S-Bahn number 1, which leaves every 20 or 30 minutes). The uni­ver­si­ty is easily reached from Bochum, Essen, Mülheim an der Ruhr and Duisburg.

You can also take the bus or subway train from Dort­mund city to the uni­ver­si­ty: From Dort­mund main station, you can take any train bound for the Station “Stadtgarten”, usually lines U41, U45, U 47 and U49. At “Stadtgarten” you switch trains and get on line U42 towards “Hombruch”. Look out for the Station “An der Palmweide”. From the bus stop just across the road, busses bound for TU Dort­mund University leave every ten minutes (445, 447 and 462). Another option is to take the subway routes U41, U45, U47 and U49 from Dort­mund main station to the stop “Dort­mund Kampstraße”. From there, take U43 or U44 to the stop “Dort­mund Wittener Straße”. Switch to bus line 447 and get off at “Dort­mund Uni­ver­si­tät S”.

The AirportExpress is a fast and convenient means of transport from Dortmund Airport (DTM) to Dortmund Central Station, taking you there in little more than 20 minutes. From Dortmund Central Station, you can continue to the university campus by interurban railway (S-Bahn). A larger range of international flight connections is offered at Düsseldorf Airport (DUS), which is about 60 kilometres away and can be directly reached by S-Bahn from the university station.

The H-Bahn is one of the hallmarks of TU Dort­mund University. There are two stations on North Campus. One (“Dort­mund Uni­ver­si­tät S”) is directly located at the suburban train stop, which connects the uni­ver­si­ty directly with the city of Dort­mund and the rest of the Ruhr Area. Also from this station, there are connections to the “Technologiepark” and (via South Campus) Eichlinghofen. The other station is located at the dining hall at North Campus and offers a direct connection to South Campus every five minutes.

The facilities of TU Dortmund University are spread over two campuses, the larger Campus North and the smaller Campus South. Additionally, some areas of the university are located in the adjacent “Technologiepark”.

Site Map of TU Dortmund University (Second Page in English).