Publications (10)
Back action of graphene charge detectors on graphene and carbon nanotube quantum dots
C. Volk, S. Engels, C. Neumann +1
We report on devices based on graphene charge detectors (CDs) capacitively coupled to graphene and carbon nanotube quantum dots (QDs). We focus on back action effects of the CD on…
Transport spectroscopy of ultraclean tunable band gaps in bilayer graphene
E. Icking, L. Banszerus, F. Wörtche +11
The importance of controlling both the charge carrier density and the band gap of a semiconductor cannot be overstated, as it opens the doors to a wide range of applications, inclu…
Size quantization of Dirac fermions in graphene constrictions
B. Terrés, L. A. Chizhova, F. Libisch +9
Quantum point contacts (QPCs) are cornerstones of mesoscopic physics and central building blocks for quantum electronics. Although the Fermi wave-length in high-quality bulk graphe…
Dielectric screening of the Kohn anomaly of graphene on hexagonal boron nitride
F. Forster, A. Molina-Sanchez, S. Engels +5
Kohn anomalies in three-dimensional metallic crystals are dips in the phonon dispersion that are caused by abrupt changes in the screening of the ion-cores by the surrounding elect…
Graphene-based charge sensors
C. Neumann, C. Volk, S. Engels +1
We discuss graphene nanoribbon-based charge sensors and focus on their functionality in the presence of external magnetic fields and high frequency pulses applied to a nearby gate…
Impact of thermal annealing on graphene devices encapsulated in hexagonal boron nitride
S. Engels, B. Terrés, F. Klein +6
We present a thermal annealing study on single-layer and bilayer (BLG) graphene encapsulated in hexagonal boron nitride. The samples are characterized by electron transport and Ram…
Transport in coupled graphene-nanotube quantum devices
S. Engels, P. Weber, B. Terrés +6
We report on the fabrication and characterization of all-carbon hybrid quantum devices based on graphene and single-walled carbon nanotubes. We discuss both, carbon nanotube quantu…
Limitations to Carrier Mobility and Phase-Coherent Transport in Bilayer Graphene
S. Engels, B. Terrés, A. Epping +5
We present transport measurements on high-mobility bilayer graphene fully encapsulated in hexagonal boron nitride. We show two terminal quantum Hall effect measurements which exhib…
Etched graphene quantum dots on hexagonal boron nitride
S. Engels, A. Epping, C. Volk +6
We report on the fabrication and characterization of etched graphene quantum dots (QDs) on hexagonal boron nitride (hBN) and SiO2 with different island diameters. We perform a stat…
Etched graphene single electron transistors on hexagonal boron nitride in high magnetic fields
A. Epping, S. Engels, C. Volk +4
We report on the fabrication and electrical characterisation of etched graphene single electron transistors (SETs) of various sizes on hexagonal boron nitride (hBN) in high magneti…