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Suspended graphene is difficult to image by scanning probe microscopy due tothe inherent van-der-Waals and dielectric forces exerted by the tip which arenot counteracted by a substrate. Here, we report scanning tunneling microscopydata of suspended monolayer graphene in constant-current mode revealing asurprising honeycomb structure with amplitude of 50$-$200 pm and latticeconstant of 10-40 nm. The apparent lattice constant is reduced by increasingthe tunneling current $I$, but does not depend systematically on tunnelingvoltage $V$ or scan speed $v_{\rm scan}$. The honeycomb lattice of the ripplingis aligned with the atomic structure observed on supported areas, while noatomic corrugation is found on suspended areas down to the resolution of about$3-4$ pm. We rule out that the honeycomb structure is induced by the feedbackloop using a changing $v_{\rm scan}$, that it is a simple enlargement effect ofthe atomic resolution as well as models predicting frozen phonons or standingphonon waves induced by the tunneling current. Albeit we currently do not havea convincing explanation for the observed effect, we expect that our intriguingresults will inspire further research related to suspended graphene.

Apparent rippling with honeycomb symmetry and tunable periodicity observed by scanning tunneling microscopy on suspended graphene