2D mechanical resonators with graphene heterostructures

2017-11-23 13:15:00 2017-11-23 14:00:00 Europe/Helsinki 2D mechanical resonators with graphene heterostructures LTL Quantum Physics Seminar (Nanotalo). Speaker: Mr. Marco Will (Aalto University, Finland). http://physics.aalto.fi/en/midcom-permalink-1e7c61ce207d4f2c61c11e7aae6c72c3105fe29fe29 Puumiehenkuja 2, 02150, Espoo

LTL Quantum Physics Seminar (Nanotalo). Speaker: Mr. Marco Will (Aalto University, Finland).

23.11.2017 / 13:15 - 14:00
Puumiehenkuja 2, 02150, Espoo, Otaniemi, FI

We fabricate 2d mechanical resonators from gr/hBN and gr/NbSe2/gr heterostructures. The resonators are coupled to a superconducting cavity to investigate the optomechanical behavior of heterostructures and enable high sensitivity measurements. The measured quality factors of up to Q=240k at low temperatures are comparable to other few-layer graphene resonators. The ringdown method is applied to investigate the dissipation in the membranes and find lower resistance compared to few-layer graphene devices. The peculiar low-temperature dependence of the intrinsic quality factor points to dissipation over two-level systems which in turn relax over the electronic system.