Homepage of the 2nd Institute of Physics, RWTH Aachen - News

Current events

Next talk tomorrow at 11:00 by Yeganeh Mirzanejad!

News 05.07.2025
New publication: Electric-Field-Tunable Spin−Orbit Gap in a Bilayer Graphene/WSe2 Quantum Dot

Site Content:

04.09.2014

Christoph Stampfer honoured as Young Scientist by World Economic Forum

../../images/news/afd2.png

Christoph Stampfer has been selected and honoured as one of the “30 exceptional scientists under the age of 40” in the 2014 World Economic Forum.

Professor Christoph Stampfer has been selected as a Young Scientist by the World Economic Forum, recognizing his “expertise and thought leadership” in the field of Experimental Physics. The appointment comes with an exclusive invitation to this year’s Annual New Champions meeting in Tianjin, China, alongside leading figures in business and politics.

Each year, the World Economic Forum selects 30 exceptional scientists below the age of 40 to participate alongside business and political leaders in the Annual Meeting of the New Champions in China. The winners are scientists chosen world-wide, representing a wide range of disciplines. The selected “Young Scientists” bring value to the Annual Meeting by “contributing their scientific perspective and delivering the most up-to-date trends from various fields of science.”

For more information please see http://www.weforum.org/news/world-economic-forum-honours-its-2014-young-scientists-community-annual-meeting-new-champions.

read more

12.06.2014

Master Programme Nanoelectronics

The new flyer of the Master Programme Nanoelectronics at the RWTH is ready for download (link).

read more

11.04.2014

Stuart Parkin receives the 2014 Millennium Technology Prize

For more information please see link.

read more

07.04.2014

Spiegel Online Artikel über "Wunderwerkstoff Graphen: Biegsam, dünn und superhart"

Den Artikel finden Sie unter folgendem Link.

read more

04.04.2014

New publication: Unambiguous determination of spin dephasing times in ZnO

../../images/news/pss-ZnO.png

Phys. Status Solidi B (2014)
Time-resolved magneto-optics is a well-established optical pump–probe technique to generate and to probe spin coherence in semiconductors. By this method, spin dephasing times T2* can easily be determined if their values are comparable to the available pump–probe delays. If T2* exceeds the laser repetition time, however, resonant spin amplification (RSA) can equally be used to extract T2* image. We demonstrate that in ZnO these techniques have several tripping hazards resulting in deceptive values for T2* and show how to avoid them. We show that the temperature dependence of the amplitude ratio of two separate spin species can easily be misinterpreted as a strongly temperature-dependent T2* of a single spin ensemble, while the two spin species have T2* values, which are nearly independent of temperature. Additionally, consecutive pump pulses can significantly diminish the spin polarization, which remains from previous pump pulses. While this barely affects T2* values extracted from delay line scans, it results in seemingly shorter inline image values in RSA.

read more

27.03.2014

New publication: Reducing disorder in graphene nanoribbons by chemical edge modification

../../images/news/Bild_APL_104.png

Appl. Phys. Lett. 104, 083105 (2014)
We present electronic transport measurements on etched graphene nanoribbons on silicon dioxide before and after a short hydrofluoric acid (HF) treatment. We report on changes in the transport properties, in particular, in terms of a decreasing transport gap and a reduced doping level after HF dipping. Interestingly, the effective energy gap is nearly unaffected by the HF treatment. Additional measurements on a graphene nanoribbon with lateral graphene gates support strong indications that the HF significantly modifies the edges of the investigated nanoribbons leading to a significantly reduced disorder potential in these graphene nanostructures.

read more

24.03.2014

Official Kick-Off of the Marie Curie Initial Training Network SPINOGRAPH in Braga, Protugal

For more information on Spinograph please see www.spinograph.org

../../images/news/spinograph_logo.png
read more

12.03.2014

New publication: Negative quantum capacitance in graphene nanoribbons with lateral gates

../../images/news/Sim_ribbon.png

Phys. Rev. B 89, 115406 (2014)
We present numerical simulations of the capacitive coupling between graphene nanoribbons of various widths and gate electrodes in different configurations. We compare the influence of lateral metallic or graphene side gate structures on the overall back gate capacitive coupling. Most interestingly, we find a complex interplay between quantum capacitance effects in the graphene nanoribbon and the lateral graphene side gates, giving rise to an unconventional negative quantum capacitance. The emerging nonlinear capacitive couplings are investigated in detail. The experimentally relevant relative lever arm, the ratio between the coupling of the different gate structures, is discussed.

read more

Showing 249 - 256 (262 total) - Previous Next