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AG Experimentelle Nanophysik

In der Arbeitsgruppe Experimentelle Nanophysik werden ultradünne 2D-Materialien mit Methoden der Oberflächenforschung präpariert und charakterisiert. Ausgehend vom prototypischen Graphen (Physiknobelpreis 2010), das aus einer monoatomaren Schicht Kohlenstoff besteht, sind in den letzten Jahren zahlreiche weitere Mitglieder dieser Materialklasse entdeckt worden. Theoretisch  sind sogar einige hundert verschiedene Materialien möglich, von denen allerdings nur sehr wenige bereits synthetisiert werden konnten.

Unsere wichtigste Untersuchungsmethode ist die Rastertunnelmikroskopie (STM), mit der atomare Auflösung erreicht werden kann. Wir präparieren fortgeschrittene 2D-Materialien wie Komposite aus Graphen und hexagonalem Bornitrit oder ultradünne Halbleiter wie MoS2 unter genau kontrollierten Bedingungen, und modifizieren diese Schichten gezielt, um z. B. eine Dotierung zu bewirken oder die Wechselwirkung mit potenziell störenden Gasen aus der Umgebung zu untersuchen. In den letzten Jahren konnten wir so unter anderem zeigen, dass man Elektronen in Quantenpunkten aus Graphen einsperren kann, in welcher Form Graphen durch den Beschuss mit energetischen Ionen beschädigt wird, und wie es Fremdatome schaffen, zwischen 2D-Materialien und ihre Unterlage zu kriechen (Interkalation).

Neueste Nachrichten / Latest News


21.9.2019 Kai Mehlich presented his main findings in a talk "In plane heterostructures in transition metal dichalcogenides" as the final step of his M. Sc. in Physics. Congratulations!


9.9.2019 Alice Bremerich handed in her Bachelor's thesis "Inbetriebnahme eines Auger Spektrometers". Well done!

8.5.2019 Our paper "Lifting Epitaxial Graphene by Intercalation of Alkali Metals" was published in J. Phys. Chem. C. We have precisely determined the structure of intercalated graphene and find that already a small amount of Lithium is sufficient to fully delaminate graphene from Ir(111). Authors are C. C. Silva, J. Cai, W. Jolie, D. Dombrowski, F. H. Farwick zum Hagen, A. J. Martínez-Galera, C. Schlueter, T.-L. Lee and C. Busse.

29.4.2019 Veronika Blecker joined our group. She will establish evaporation of sulfur from FeS2 for the growth of ultrathin films.


 April 2019 Our new VT-STM from Scienta Omicron arrived and got installed.

VT-STM


01.04.2019 We welcome Alice Bremerich as a new group member. In her Bachelorthesis, she will use Auger electron spectroscopy (AES) to characterize surfaces especially 2D materials.


28.3.2019 Our paper "Tomonaga-Luttinger liquid in a box: Electrons confined within MoS2 mirror-twin boundaries" was published in Physical Review X. Here, we observe spin-charge separation in one-dimensional wires. Authors are W. Jolie, C. Murray, P. S. Weiß, J. Hall, F. Portner, N. Atodiresei, A. V. Krasheninnikov, C. Busse, H.-P. Komsa, A. Rosch und T. Michely.


26.3.2019 Our paper "Comprehensive tunneling spectroscopy of quasi-freestanding MoS2 on graphene on Ir(111)" was published in Phys. Rev. B. Here, we use a combination of different modes of scanning tunneling spectroscopy (STS) to reveal the band gap of MoS2 as well as additional critical point energies in the band structure. Authors are C. Murray, W. Jolie, J. A. Fischer, J. Hall, C. van Efferen, N. Ehlen, A. Grüneis, C. Busse, and T. Michely.


15.3.2019 We welcome Paulus Aleksa as a new group member. In his PhD-thesis, he will investigate two-dimensional ferroelectric materials.
12.3.2019 Our paper "Charge density wave phase of VSe2"  was published in Phys. Rev. B. In this work we use scanning tunneling spectroscopy (STS) to investigate the change in the electronic structure of VSe2 induced by correlated electrons. Authors are W. Jolie, T. Knispel, N. Ehlen, K. Nikonov, C. Busse, A. Grüneis and T. Michely.
8.1.2019 Our scanning tunneling microscope "TuMA 3" arrived from Münster.

28.11.2018 Our paper "Modifying the geometric and electronic structure of hexagonal boron nitride on Ir(111) by Cs adsorption and intercalation" was published in Phys. Rev. B.  Here, we show how the geometric and electronic properties of the ultrathin insulator hBN can me tuned by interacion with the electron donor Cs. Authors are J. Cai, W. Jolie, C. Silva, M. Petrovic, C. Schlueter, T. Michely, M. Kralj, T.-L. Lee, and C. Busse.


6.11.2018 New Member: Thaís Chagas joins the group.


30.10.2018 Joshua Fuhrmann successfully completed his Bachelor thesis: Aufbau eines Rastertunnelmikroskops unter Umgebungsbedingungen


9.10.2018 Dina Wilks successfully completed her Bachelor thesis: Elektrochemischer Transfer von Graphen und hexagonalem Bornitrid


29.8.2018 Our paper "Resonance Raman Spectrum of Doped Epitaxial Graphene at the Lifshitz Transition" was published in Nano Letters. Authors are M. G. Hell, N. Ehlen, B. V. Senkovskiy, E. H. Hasdeo, A. Fedorov, D. Dombrowski, C. Busse, T. Michely, G. di Santo, L. Petaccia, R. Saito, and  A. Grüneis. Here, we employ ultra-high vacuum (UHV) Raman spectroscopy in tandem with angle-resolved photoemission

(ARPES) to investigate the doping-dependent Raman spectrum of epitaxial graphene on Ir(111).


20.7.2018 Our paper "Valleys and hills of graphene on Ru(0001)" was published in J. Phys. Chem. C. In this work, we precisely determine the shape of a single layer of graphene using X-ray Standing Waves and find a good match to results from Density Functional Theory. Authors are C. Silva, M. Iannuzzi, D. Duncan,P. Ryan, K. Clarke, J. Küchle, J. Cai, W. Jolie, C. Schlueter, T.-L. Lee, and C: Busse
04.06.2018  New Members: Joshua Fuhrmann and Dina Wilks join the group.
01.05.2018  New Member: Dr. Robin Ohmann joins the group.
16.04.2018  New Member: Dennis Rybakowski joins the group.

08.03.2018  Our paper "Suppression of quasiparticle scattering signals in bilayer graphene due to layer polarization and destructive interference" was published in Phys. Rev. Lett. In this work, we demonstrate that electrons in bilayer graphene can be localized in one of the two layers only.
Graphene_bilayer_teaser

 19.01.2018 Our paper "Molecular beam epitaxy of quasi-freestanding transition metal disulphide monolayers on van der Waals substrates: a growth sstudy" was published in 2D Materials. In this work, we describe a new approach to grow transition metal dichalcogenides on top of graphene and hexagonal boron nitride.


 01.11.2017   The formation of our new group was featured in Siegener Zeitung (SZ) and  Westfalenpost (WP) (see also  the university's news).