4 papers
Radially polarized light beams from spin-forbidden dark excitons and trions in monolayer WSe
Sven Borghardt, Jens Sonntag, Jhih-Sian Tu +5
The rich optical properties of transition metal dichalcogenide monolayers (TMD-MLs) render these materials promising candidates for the design of new optoelectronic devices. Despit…
Excellent electronic transport in heterostructures of graphene and monoisotopic boron-nitride grown at atmospheric pressure
J. Sonntag, J. Li, A. Plaud +4
Hexagonal boron nitride (BN), one of the very few layered insulators, plays a crucial role in 2D materials research. In particular, BN grown with a high pressure technique has prov…
Integrated impedance bridge for absolute capacitance measurements at cryogenic temperatures and finite magnetic fields
G. J. Verbiest, H. Janssen, D. Xu +10
We developed an impedance bridge that operates at cryogenic temperatures (down to 60 mK) and in perpendicular magnetic fields up to at least 12 T. This is achieved by mounting a Ga…
Giant magneto-photoelectric effect in suspended graphene
Jens Sonntag, Annika Kurzmann, Martin Geller +3
We study the optical response of a suspended graphene field-effect transistor in magnetic fields of up to 9 T (quantum Hall regime). With an illumination power of only 3 μW, we mea…