Dept. of Microtechnology and Nanoscience
Quantum Device Physics Laboratory
Phone: +46 31 772 3318
Office: MC2 building, room D515
3D Topological Insulators (Tis) nanoribbons, Topological superconductivity and Majorana fermions. Atomically thin 2D nanomaterials including graphene, transition metal dichalcogenides and related van der Waals heterostructures.
Growth of nanoribbons, Magnetotransport in nanoscale Topological insulators, fabrication and transport of Josephson junctions, Microwave Andreev level spectroscopy.
Focus of future research:
- To establish a reliable fabrication process for the growth of 3D TI nanoribbon at Chalmers
- To study strain induced modification of the topological surface states in 3D TI for novel devices
- Majorana fermions physics
- To use the topological protection of the surface states for make charge pump with accuracy beyond the present state of art
Highlights of previous research:
Experimental observation of an unconventional superconductivity induced in the surface states of Bi2Te3 TI . The findings are compatible with topological superconductivity.
"Induces unconventional superconductivity on the surface states of Bi2 Te3 Topological insulator"
S. Charpentier, L. Galletti, G.Kunakova, R. Arpaia, Y. Song, R. Baghdadi, S.M. Wang, A. Kalaboukhov, E. Olsson, F. Tafuri, D. Golubev, J. Linder, T. Bauch and F. Lombardi
Nature Commun. 8, 2019 (2017)
The picture (scale bar: 200 nm) shows one of the devices used in the experiment. Because of the stress, induced by various cool downs, a clear buckling feature appears in the nanogap of the device. This modification is causing the characteristics of the superconducting pairs of electron to vary in different directions, a signature of unconventional superconductivity.