Anomalous Dynamical Behavior of Freestanding Graphene Membranes.
We report subnanometer, high-bandwidth measurements of the out-of-plane (vertical) motion of atoms in freestanding graphene using scanning tunneling microscopy. By tracking the vertical position over a long time period, a 1000-fold increase in the ability to measure space-time dynamics of atomically thin membranes is achieved over the current state-of-the-art imaging technologies. We observe that the vertical motion of a graphene membrane exhibits rare long-scale excursions characterized by both anomalous mean-squared displacements and Cauchy-Lorentz power law jump distributions.
Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
M L
ML
Ackerman
Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
P
P
Kumar
Department of Physics, Shahid Rajaee Teacher Training University, 16875-163 Lavizan, Tehran, Iran.
M
M
Neek-Amal
Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
P M
PM
Thibado
Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium.
F M
FM
Peeters
Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
Surendra
S
Singh