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News 23.11.2024
Inspiring insights into the world of attoseconds by Bernd Beschoten

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23.11.2024

Inspiring insights into the world of attoseconds by Bernd Beschoten

Today, Bernd Beschoten from our group fascinated the audience with his "November-Vorlesung", i.e. talk on the world's shortest light pulses: femtoseconds and attoseconds. A truly inspiring journey through cutting-edge physics!

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12.11.2024

New publication: Identifying Band Structure Changes of FePS3 across the Antiferromagnetic Phase Transition

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ACS Nano 18, 32924 (2024)
Magnetic 2D materials enable interesting tuning options of magnetism. As an example, the van der Waals material FePS3, a zig-zag-type intralayer antiferromagnet, exhibits very strong magnetoelastic coupling due to the different bond lengths along different ferromagnetic and antiferromagnetic coupling directions enabling elastic tuning of magnetic properties. The likely cause of the length change is the intricate competition between direct exchange of the Fe atoms and superexchange via the S and P atoms. To elucidate this interplay, we study the band structure of exfoliated FePS3 by μm scale ARPES (angular resolved photoelectron spectroscopy), both, above and below the Néel temperature TN. We found three characteristic changes across TN. They involve S 3p-type bands, Fe 3d-type bands and P 3p-type bands, respectively, as attributed by comparison with density functional theory calculations (DFT + U). This highlights the involvement of all the atoms in the magnetic phase transition providing independent evidence for the intricate exchange paths.

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11.11.2024

New publication: Electrically Controlled Excitons, Charge Transfer Induced Trions, and Narrowband Emitters in MoSe2−WSe2 Lateral Heterostructure

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Nano Letters 24, 14615 (2024)
Controlling excitons and their transport in two-dimensional (2D) transition metal dichalcogenide heterostructures is central to advancing photonics and electronics on-chip integration. We investigate the controlled generation and manipulation of excitons and their complexes in monolayer MoSe2−WSe2 lateral heterostructures (LHSs). Incorporating graphene as a back gate and edge contact in a field-effect transistor geometry, we achieve the precise electrical tuning of exciton complexes and their transfer across interfaces. Photoluminescence and photocurrent maps at 4 K reveal the synergistic effect of the local electric field and interface phenomena in the modulation of excitons, trions, and free carriers. We observe spatial variations in the exciton and trion densities driven by exciton−trion conversion under electrical manipulation. Additionally, we demonstrate controlled narrow-band emissions within the LHS through carrier injection and electrical biasing. Density functional theory calculation reveals significant band modification at the lateral interfaces. This work advances exciton manipulation in LHS and shows promise for next-generation 2D quantum devices.

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08.11.2024

Another Successful Wissenschaftsnacht at RWTH Aachen University!

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Once again, the Wissenschaftsnacht at RWTH Aachen proved to be a resounding success! This year, as in previous years, many members of our group contributed their time and expertise to make the evening a memorable experience for visitors.

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04.11.2024

Eike Icking successfully defended his PhD thesis

On Monday 04.11.2024, Eike Icking successfully defended his PhD thesis. Congratulations to Dr. Eike Icking on this great accomplishment! Note the fantastic cake by Corinne Steiner.

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27.09.2024

Samuel Möller successfully defended his PhD thesis

On 27.09.2024, Samuel Möller successfully defended his PhD thesis. Congratulations to Dr. Samuel Möller on this commendable accomplishment!

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20.09.2024

Emma Horgan from Imperial College London completes a 12-week ML4Q Undergraduate Research Internship

Today we celebrated that Emma Horgan from Imperial College London successfully completed her 12-week internship in our group as part of the ML4Q Undergraduate Research Internship Program. During her internship, Emma actively participated in our research activities related to bilayer graphene quantum dots and made valuable contributions to our ongoing projects. We greatly appreciate Emma's enthusiasm and the fresh perspectives she has brought to our team. We wish her all the best!

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19.09.2024

Institute Excursion to Wildenhof: A Day of Fun

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Last Friday, our annual institute excursion to the Wildenhof at the Rursee took place once again, and it was a great fun! The day kicked off with cycling (for a few of us) and various water sport activities in the morning. In the afternoon, we gathered on the terrace for a barbecue, with plenty of food and drinks to go around. A big thank you to everyone who participated and helped make this happen!

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