Title: Spin Dynamics and Relaxation in Graphene Nanoribbons: Electron Spin Resonance Probing
Authors: Rao, Singamaneni S ×
Stesmans, Andre
van Tol, Johan
Kosynkin, Dmitry V
Higginbotham-Duque, A
Lu, Wei
Sinitskii, Alexander
Tour, James. M #
Issue Date: 2012
Publisher: American Chemical Society
Series Title: ACS Nano vol:6 issue:9 pages:7615-7623
Abstract: Here we report the results of a multifrequency (∼9, 20, 34, 239.2, and 336 GHz) variable-temperature
continuous wave (cw) and X-band (∼9 GHz) pulse electron spin resonance (ESR) measurement
performed at cryogenic temperatures on potassium split graphene nanoribbons (GNRs). Important
experimental findings include the following: (a) The multifrequency cw ESR data infer the presence of
only carbon-related paramagnetic nonbonding states, at any measured temperature, with the g value
independent of microwave frequency and temperature. (b) A linear broadening of the ESR signal as a
function of microwave frequency is noticed. The observed linear frequency dependence of ESR signal
width points to a distribution of g factors causing the non-Lorentzian line shape, and the g broadening
contribution is found to be very small. (c) The ESR process is found to be characterized by slow and fast
components, whose temperature dependence's could be well described by a tunneling level state
model. This work not only could help in advancing the present fundamental understanding on the
edge spin (or magnetic)-based properties of GNRs but also pave the way to GNR-based spin devices.
ISSN: 1936-0851
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Semiconductor Physics Section
× corresponding author
# (joint) last author

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