Substrate engineered graphene resonators.

With ~large Young's modulus, broad frequency tunability, high sample quality and ultra-low mass[1] , free- hanging, single layer graphene resonators have emerged as an attractive candidate for anno and opto-mechnical studies[2]. However, the quality-factor (Q) of graphene resonators have been absymally low.~Here we demonstrate the role of discrete substrate modes on the shape of graphene resonance and in particular, the quality factors. We furthermore present an alternative route to excite such resonators, through coherently driven high Q substrate mode. Such hybrid substrate modes, with low graphene mass but high substarte Q can be applied in ultra-high resolution mass sensors[3] at room temperature. References: [1]J.S.Bunch et al., Science 315, 490 (2007). [2]K.S.Novoselov et al., Science 306, 666 (2004). [3]J.Chaste et al., Nature Nanotechnology 7, 301 (2012).